Merge pull request #236 from MikaylaFischler/devel

2023.05.22 Release

.devcontainer/devcontainer.json

@@ -0,0 +1,16 @@
+{
+	"image": "mcr.microsoft.com/devcontainers/universal:2",
+	"features": {
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"sumneko.lua",
+				"jackmacwindows.vscode-computercraft",
+				"ms-python.python",
+				"Catppuccin.catppuccin-vsc-icons",
+				"melishev.feather-vscode"
+			]
+		}
+	}
+}

.github/workflows/check.yml

@@ -0,0 +1,31 @@
+name: Lua Checks
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+      - latest
+      - devel
+  pull_request:
+    branches:
+      - main
+      - latest
+      - devel
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3.5.1
+      - name: Luacheck
+        uses: lunarmodules/luacheck@v1.1.0
+        with:
+          # Argument Explanations
+          # -i 121 = Setting a read-only global variable
+          #    512 = Loop can be executed at most once
+          #    542 = An empty if branch
+          # --no-max-line-length = Disable warnings for long line lengths
+          # --exclude-files ...  = Exclude lockbox library (external) and config files
+          # --globals ...        = Override all globals overridden in .vscode/settings.json AND 'os' since CraftOS 'os' differs from Lua's 'os'
+          args: . --no-max-line-length -i 121 512 542 --exclude-files ./lockbox/* ./*/config.lua --globals os _HOST bit colors fs http parallel periphemu peripheral read rs settings shell term textutils window

.github/workflows/shields.yml

@@ -0,0 +1,47 @@
+# Simple workflow for deploying static content to GitHub Pages
+name: Deploy Component Versions
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ["main"]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  # Single deploy job since we're just deploying
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Pages
+        uses: actions/configure-pages@v3
+      - name: Setup Python
+        uses: actions/setup-python@v3.1.3
+      - run: mkdir shields
+      - run: python imgen.py shields
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v1
+        with:
+          # Upload shields JSON
+          path: 'shields/'
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v2

.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+    "recommendations": [
+        "sumneko.lua",
+        "jackmacwindows.vscode-computercraft",
+        "ms-python.python"
+    ]
+}

.vscode/settings.json

@@ -1,22 +1,28 @@
 {
     "Lua.diagnostics.globals": [
-        "term",
-        "fs",
-        "peripheral",
-        "rs",
-        "bit",
-        "parallel",
-        "colors",
-        "textutils",
-        "shell",
-        "settings",
-        "window",
-        "read",
-        "periphemu",
-        "mekanismEnergyHelper",
         "_HOST",
-        "http"
+        "bit",
+        "colors",
+        "fs",
+        "http",
+        "parallel",
+        "periphemu",
+        "peripheral",
+        "read",
+        "rs",
+        "settings",
+        "shell",
+        "term",
+        "textutils",
+        "window"
     ],
+    "Lua.diagnostics.severity": {
+        "unused-local": "Information",
+        "unused-vararg": "Information",
+        "unused-function": "Warning",
+        "unused-label": "Information"
+    },
+    "Lua.hint.setType": true,
     "Lua.diagnostics.disable": [
         "duplicate-set-field"
     ]

README.md

@@ -1,6 +1,12 @@
 # cc-mek-scada
 Configurable ComputerCraft SCADA system for multi-reactor control of Mekanism fission reactors with a GUI, automatic safety features, waste processing control, and more! 
 
+![GitHub](https://img.shields.io/github/license/MikaylaFischler/cc-mek-scada)
+![GitHub release (latest by date including pre-releases)](https://img.shields.io/github/v/release/MikaylaFischler/cc-mek-scada?include_prereleases)
+![GitHub Workflow Status (with branch)](https://img.shields.io/github/actions/workflow/status/MikaylaFischler/cc-mek-scada/check.yml?branch=main&label=main)
+![GitHub Workflow Status (with branch)](https://img.shields.io/github/actions/workflow/status/MikaylaFischler/cc-mek-scada/check.yml?branch=latest&label=latest)
+![GitHub Workflow Status (with branch)](https://img.shields.io/github/actions/workflow/status/MikaylaFischler/cc-mek-scada/check.yml?branch=devel&label=devel)
+
 Mod Requirements:
 - CC: Tweaked
 - Mekanism v10.1+
@@ -12,6 +18,25 @@ v10.1+ is required due the complete support of CC:Tweaked added in Mekanism v10.
 
 There was also an apparent bug with boilers disconnecting and reconnecting when active in my test world on 10.0.24, so it may not even have been an option to fully implement this with support for 10.0.
 
+## Released Component Versions
+
+### Core
+
+![Bootloader](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Fbootloader.json)
+![Comms](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Fcomms.json)
+
+### Utilities
+
+![Installer](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Finstaller.json)
+
+### Applications
+
+![Reactor PLC](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Freactor-plc.json)
+![RTU](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Frtu.json)
+![Supervisor](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Fsupervisor.json)
+![Coordinator](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Fcoordinator.json)
+![Pocket](https://img.shields.io/endpoint?url=https%3A%2F%2Fmikaylafischler.github.io%2Fcc-mek-scada%2Fpocket.json)
+
 ## Installation
 
 You can install this on a ComputerCraft computer using either:

ccmsi.lua

@@ -3,14 +3,14 @@
 --
 
 --[[
-Copyright © 2023 Mikayla Fischler
+Copyright (c) 2023 Mikayla Fischler
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
-associated documentation files (the “Software”), to deal in the Software without restriction,
+associated documentation files (the "Software"), to deal in the Software without restriction,
 including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
 and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so.
 
-THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

coordinator/apisessions.lua

@@ -1,20 +0,0 @@
-local apisessions = {}
-
----@param packet capi_frame
-function apisessions.handle_packet(packet)
-end
-
--- attempt to identify which session's watchdog timer fired
----@param timer_event number
-function apisessions.check_all_watchdogs(timer_event)
-end
-
--- delete all closed sessions
-function apisessions.free_all_closed()
-end
-
--- close all open connections
-function apisessions.close_all()
-end
-
-return apisessions

coordinator/config.lua

@@ -3,13 +3,14 @@ local config = {}
 -- port of the SCADA supervisor
 config.SCADA_SV_PORT = 16100
 -- port to listen to incoming packets from supervisor
-config.SCADA_SV_LISTEN = 16101
+config.SCADA_SV_CTL_LISTEN = 16101
 -- listen port for SCADA coordinator API access
 config.SCADA_API_LISTEN = 16200
 -- max trusted modem message distance (0 to disable check)
 config.TRUSTED_RANGE = 0
 -- time in seconds (>= 2) before assuming a remote device is no longer active
-config.COMMS_TIMEOUT = 5
+config.SV_TIMEOUT = 5
+config.API_TIMEOUT = 5
 
 -- expected number of reactor units, used only to require that number of unit monitors
 config.NUM_UNITS = 4
@@ -27,5 +28,7 @@ config.LOG_PATH = "/log.txt"
 --  0 = APPEND (adds to existing file on start)
 --  1 = NEW (replaces existing file on start)
 config.LOG_MODE = 0
+-- true to log verbose debug messages
+config.LOG_DEBUG = false
 
 return config

coordinator/coordinator.lua

@@ -3,15 +3,15 @@ local log         = require("scada-common.log")
 local ppm         = require("scada-common.ppm")
 local util        = require("scada-common.util")
 
-local apisessions = require("coordinator.apisessions")
 local iocontrol   = require("coordinator.iocontrol")
 local process     = require("coordinator.process")
 
+local apisessions = require("coordinator.session.apisessions")
+
 local dialog      = require("coordinator.ui.dialog")
 
 local print = util.print
 local println = util.println
-local print_ts = util.print_ts
 local println_ts = util.println_ts
 
 local PROTOCOL = comms.PROTOCOL
@@ -225,7 +225,8 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
         sv_r_seq_num = nil,
         sv_config_err = false,
         connected = false,
-        last_est_ack = ESTABLISH_ACK.ALLOW
+        last_est_ack = ESTABLISH_ACK.ALLOW,
+        last_api_est_acks = {}
     }
 
     comms.set_trusted_range(range)
@@ -241,12 +242,15 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
 
     _conf_channels()
 
+    -- link modem to apisessions
+    apisessions.init(modem)
+
     -- send a packet to the supervisor
     ---@param msg_type SCADA_MGMT_TYPE|SCADA_CRDN_TYPE
     ---@param msg table
     local function _send_sv(protocol, msg_type, msg)
         local s_pkt = comms.scada_packet()
-        local pkt = nil ---@type mgmt_packet|crdn_packet
+        local pkt   ---@type mgmt_packet|crdn_packet
 
         if protocol == PROTOCOL.SCADA_MGMT then
             pkt = comms.mgmt_packet()
@@ -263,6 +267,19 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
         self.sv_seq_num = self.sv_seq_num + 1
     end
 
+    -- send an API establish request response
+    ---@param dest integer
+    ---@param msg table
+    local function _send_api_establish_ack(seq_id, dest, msg)
+        local s_pkt = comms.scada_packet()
+        local m_pkt = comms.mgmt_packet()
+
+        m_pkt.make(SCADA_MGMT_TYPE.ESTABLISH, msg)
+        s_pkt.make(seq_id, PROTOCOL.SCADA_MGMT, m_pkt.raw_sendable())
+
+        modem.transmit(dest, api_listen, s_pkt.raw_sendable())
+    end
+
     -- attempt connection establishment
     local function _send_establish()
         _send_sv(PROTOCOL.SCADA_MGMT, SCADA_MGMT_TYPE.ESTABLISH, { comms.version, version, DEVICE_TYPE.CRDN })
@@ -283,6 +300,7 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
     ---@param new_modem table
     function public.reconnect_modem(new_modem)
         modem = new_modem
+        apisessions.relink_modem(new_modem)
         _conf_channels()
     end
 
@@ -417,13 +435,70 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
     ---@param packet mgmt_frame|crdn_frame|capi_frame|nil
     function public.handle_packet(packet)
         if packet ~= nil then
-            local protocol = packet.scada_frame.protocol()
             local l_port = packet.scada_frame.local_port()
+            local r_port = packet.scada_frame.remote_port()
+            local protocol = packet.scada_frame.protocol()
 
             if l_port == api_listen then
                 if protocol == PROTOCOL.COORD_API then
                     ---@cast packet capi_frame
-                    apisessions.handle_packet(packet)
+                    -- look for an associated session
+                    local session = apisessions.find_session(r_port)
+
+                    -- API packet
+                    if session ~= nil then
+                        -- pass the packet onto the session handler
+                        session.in_queue.push_packet(packet)
+                    else
+                        -- any other packet should be session related, discard it
+                        log.debug("discarding COORD_API packet without a known session")
+                    end
+                elseif protocol == PROTOCOL.SCADA_MGMT then
+                    ---@cast packet mgmt_frame
+                    -- look for an associated session
+                    local session = apisessions.find_session(r_port)
+
+                    -- SCADA management packet
+                    if session ~= nil then
+                        -- pass the packet onto the session handler
+                        session.in_queue.push_packet(packet)
+                    elseif packet.type == SCADA_MGMT_TYPE.ESTABLISH then
+                        -- establish a new session
+                        local next_seq_id = packet.scada_frame.seq_num() + 1
+
+                        -- validate packet and continue
+                        if packet.length == 3 and type(packet.data[1]) == "string" and type(packet.data[2]) == "string" then
+                            local comms_v = packet.data[1]
+                            local firmware_v = packet.data[2]
+                            local dev_type = packet.data[3]
+
+                            if comms_v ~= comms.version then
+                                if self.last_api_est_acks[r_port] ~= ESTABLISH_ACK.BAD_VERSION then
+                                    log.info(util.c("dropping API establish packet with incorrect comms version v", comms_v, " (expected v", comms.version, ")"))
+                                    self.last_api_est_acks[r_port] = ESTABLISH_ACK.BAD_VERSION
+                                end
+
+                                _send_api_establish_ack(next_seq_id, r_port, { ESTABLISH_ACK.BAD_VERSION })
+                            elseif dev_type == DEVICE_TYPE.PKT then
+                                -- pocket linking request
+                                local id = apisessions.establish_session(l_port, r_port, firmware_v)
+                                println(util.c("API: pocket (", firmware_v, ") [:", r_port, "] connected with session ID ", id))
+                                coordinator.log_comms(util.c("API: pocket (", firmware_v, ") [:", r_port, "] connected with session ID ", id))
+
+                                _send_api_establish_ack(next_seq_id, r_port, { ESTABLISH_ACK.ALLOW })
+                                self.last_api_est_acks[r_port] = ESTABLISH_ACK.ALLOW
+                            else
+                                log.debug(util.c("illegal establish packet for device ", dev_type, " on API listening channel"))
+                                _send_api_establish_ack(next_seq_id, r_port, { ESTABLISH_ACK.DENY })
+                            end
+                        else
+                            log.debug("invalid establish packet (on API listening channel)")
+                            _send_api_establish_ack(next_seq_id, r_port, { ESTABLISH_ACK.DENY })
+                        end
+                    else
+                        -- any other packet should be session related, discard it
+                        log.debug(util.c(r_port, "->", l_port, ": discarding SCADA_MGMT packet without a known session"))
+                    end
                 else
                     log.debug("illegal packet type " .. protocol .. " on api listening channel", true)
                 end
@@ -431,7 +506,7 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
                 -- check sequence number
                 if self.sv_r_seq_num == nil then
                     self.sv_r_seq_num = packet.scada_frame.seq_num()
-                elseif self.connected and self.sv_r_seq_num >= packet.scada_frame.seq_num() then
+                elseif self.connected and ((self.sv_r_seq_num + 1) ~= packet.scada_frame.seq_num()) then
                     log.warning("sequence out-of-order: last = " .. self.sv_r_seq_num .. ", new = " .. packet.scada_frame.seq_num())
                     return
                 else
@@ -516,7 +591,7 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
                         elseif packet.type == SCADA_CRDN_TYPE.UNIT_STATUSES then
                             -- update statuses
                             if not iocontrol.update_unit_statuses(packet.data) then
-                                log.error("received invalid UNIT_STATUSES packet")
+                                log.debug("received invalid UNIT_STATUSES packet")
                             end
                         elseif packet.type == SCADA_CRDN_TYPE.UNIT_CMD then
                             -- unit command acknowledgement
@@ -552,7 +627,7 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
                                 log.debug("SCADA_CRDN unit command ack packet length mismatch")
                             end
                         else
-                            log.warning("received unknown SCADA_CRDN packet type " .. packet.type)
+                            log.debug("received unknown SCADA_CRDN packet type " .. packet.type)
                         end
                     else
                         log.debug("discarding SCADA_CRDN packet before linked")
@@ -607,11 +682,11 @@ function coordinator.comms(version, modem, sv_port, sv_listen, api_listen, range
                                 end
                             elseif est_ack == ESTABLISH_ACK.COLLISION then
                                 if self.last_est_ack ~= est_ack then
-                                    log.info("supervisor connection denied due to collision")
+                                    log.warning("supervisor connection denied due to collision")
                                 end
                             elseif est_ack == ESTABLISH_ACK.BAD_VERSION then
                                 if self.last_est_ack ~= est_ack then
-                                    log.info("supervisor comms version mismatch")
+                                    log.warning("supervisor comms version mismatch")
                                 end
                             else
                                 log.debug("SCADA_MGMT establish packet reply (len = 1) unsupported")

coordinator/iocontrol.lua

@@ -18,6 +18,15 @@ local iocontrol = {}
 ---@class ioctl
 local io = {}
 
+-- luacheck: no unused args
+
+-- placeholder acknowledge function for type hinting
+---@param success boolean
+---@diagnostic disable-next-line: unused-local
+local function __generic_ack(success) end
+
+-- luacheck: unused args
+
 -- initialize the coordinator IO controller
 ---@param conf facility_conf configuration
 ---@param comms coord_comms comms reference
@@ -45,11 +54,11 @@ function iocontrol.init(conf, comms)
 
         radiation = types.new_zero_radiation_reading(),
 
-        save_cfg_ack = function (success) end,      ---@param success boolean
+        save_cfg_ack = __generic_ack,
-        start_ack = function (success) end,         ---@param success boolean
+        start_ack = __generic_ack,
-        stop_ack = function (success) end,          ---@param success boolean
+        stop_ack = __generic_ack,
-        scram_ack = function (success) end,         ---@param success boolean
+        scram_ack = __generic_ack,
-        ack_alarms_ack = function (success) end,    ---@param success boolean
+        ack_alarms_ack = __generic_ack,
 
         ps = psil.create(),
 
@@ -74,7 +83,6 @@ function iocontrol.init(conf, comms)
 
         ---@class ioctl_unit
         local entry = {
-            ---@type integer
             unit_id = i,
 
             num_boilers = 0,
@@ -85,7 +93,8 @@ function iocontrol.init(conf, comms)
             waste_control = 0,
             radiation = types.new_zero_radiation_reading(),
 
-            a_group = 0,                                                -- auto control group
+            -- auto control group
+            a_group = 0,
 
             start = function () process.start(i) end,
             scram = function () process.scram(i) end,
@@ -96,12 +105,12 @@ function iocontrol.init(conf, comms)
 
             set_group = function (grp) process.set_group(i, grp) end,   ---@param grp integer|0 group ID or 0
 
-            start_ack = function (success) end,                         ---@param success boolean
+            start_ack = __generic_ack,
-            scram_ack = function (success) end,                         ---@param success boolean
+            scram_ack = __generic_ack,
-            reset_rps_ack = function (success) end,                     ---@param success boolean
+            reset_rps_ack = __generic_ack,
-            ack_alarms_ack = function (success) end,                    ---@param success boolean
+            ack_alarms_ack = __generic_ack,
-            set_burn_ack = function (success) end,                      ---@param success boolean
+            set_burn_ack = __generic_ack,
-            set_waste_ack = function (success) end,                     ---@param success boolean
+            set_waste_ack = __generic_ack,
 
             alarm_callbacks = {
                 c_breach   = { ack = function () ack(1)  end, reset = function () reset(1)  end },
@@ -134,10 +143,10 @@ function iocontrol.init(conf, comms)
                 ALARM_STATE.INACTIVE    -- turbine trip
             },
 
-            annunciator = {},           ---@type annunciator
+            annunciator = {},   ---@type annunciator
 
             unit_ps = psil.create(),
-            reactor_data = {},          ---@type reactor_db
+            reactor_data = {},  ---@type reactor_db
 
             boiler_ps_tbl = {},
             boiler_data_tbl = {},
@@ -657,8 +666,8 @@ function iocontrol.update_unit_statuses(statuses)
                     if type(rtu_statuses.rad_mon) == "table" then
                         if #rtu_statuses.rad_mon > 0 then
                             local rad_mon = rtu_statuses.rad_mon[1]
-                            local rtu_faulted = rad_mon[1]  ---@type boolean
+                            -- local rtu_faulted = rad_mon[1]  ---@type boolean
-                            unit.radiation    = rad_mon[2]  ---@type number
+                            unit.radiation = rad_mon[2]  ---@type number
 
                             unit.unit_ps.publish("radiation", unit.radiation)
                         else
@@ -683,23 +692,13 @@ function iocontrol.update_unit_statuses(statuses)
                 end
 
                 for key, val in pairs(unit.annunciator) do
-                    if key == "TurbineTrip" then
+                    if key == "BoilerOnline" or key == "HeatingRateLow" or key == "WaterLevelLow" then
-                        -- split up turbine trip table for all turbines and a general OR combination
-                        local trips = val
-                        local any = false
-
-                        for id = 1, #trips do
-                            any = any or trips[id]
-                            unit.turbine_ps_tbl[id].publish(key, trips[id])
-                        end
-
-                        unit.unit_ps.publish("TurbineTrip", any)
-                    elseif key == "BoilerOnline" or key == "HeatingRateLow" or key == "WaterLevelLow" then
                         -- split up array for all boilers
                         for id = 1, #val do
                             unit.boiler_ps_tbl[id].publish(key, val[id])
                         end
-                    elseif key == "TurbineOnline" or key == "SteamDumpOpen" or key == "TurbineOverSpeed" then
+                    elseif key == "TurbineOnline" or key == "SteamDumpOpen" or key == "TurbineOverSpeed" or
+                           key == "GeneratorTrip" or key == "TurbineTrip" then
                         -- split up array for all turbines
                         for id = 1, #val do
                             unit.turbine_ps_tbl[id].publish(key, val[id])

coordinator/renderer.lua

@@ -2,29 +2,29 @@
 -- Graphics Rendering Control
 --
 
-local log       = require("scada-common.log")
+local log        = require("scada-common.log")
-local util      = require("scada-common.util")
+local util       = require("scada-common.util")
 
-local style     = require("coordinator.ui.style")
+local style      = require("coordinator.ui.style")
 
-local main_view = require("coordinator.ui.layout.main_view")
+local main_view  = require("coordinator.ui.layout.main_view")
-local unit_view = require("coordinator.ui.layout.unit_view")
+local unit_view  = require("coordinator.ui.layout.unit_view")
 
-local flasher   = require("graphics.flasher")
+local flasher    = require("graphics.flasher")
+
+local DisplayBox = require("graphics.elements.displaybox")
 
 local renderer = {}
 
 -- render engine
 local engine = {
-    monitors = nil,
+    monitors = nil,         ---@type monitors_struct|nil
-    dmesg_window = nil,
+    dmesg_window = nil,     ---@type table|nil
-    ui_ready = false
+    ui_ready = false,
-}
+    ui = {
-
+        main_display = nil, ---@type graphics_element|nil
--- UI layouts
+        unit_displays = {}
-local ui = {
+    }
-    main_layout = nil,
-    unit_layouts = {}
 }
 
 -- init a display to the "default", but set text scale to 0.5
@@ -57,10 +57,8 @@ function renderer.is_monitor_used(periph)
         if engine.monitors.primary == periph then
             return true
         else
-            for i = 1, #engine.monitors.unit_displays do
+            for _, monitor in ipairs(engine.monitors.unit_displays) do
-                if engine.monitors.unit_displays[i] == periph then
+                if monitor == periph then return true end
-                    return true
-                end
             end
         end
     end
@@ -74,7 +72,7 @@ function renderer.init_displays()
     _init_display(engine.monitors.primary)
 
     -- init unit displays
-    for _, monitor in pairs(engine.monitors.unit_displays) do
+    for _, monitor in ipairs(engine.monitors.unit_displays) do
         _init_display(monitor)
     end
 end
@@ -93,7 +91,7 @@ end
 function renderer.validate_unit_display_sizes()
     local valid = true
 
-    for id, monitor in pairs(engine.monitors.unit_displays) do
+    for id, monitor in ipairs(engine.monitors.unit_displays) do
         local w, h = monitor.getSize()
         if w ~= 79 or h ~= 52 then
             log.warning(util.c("RENDERER: unit ", id, " display resolution not 79 wide by 52 tall: ", w, ", ", h))
@@ -108,7 +106,6 @@ end
 function renderer.init_dmesg()
     local disp_x, disp_y = engine.monitors.primary.getSize()
     engine.dmesg_window = window.create(engine.monitors.primary, 1, 1, disp_x, disp_y)
-
     log.direct_dmesg(engine.dmesg_window)
 end
 
@@ -119,11 +116,13 @@ function renderer.start_ui()
         engine.dmesg_window.setVisible(false)
 
         -- show main view on main monitor
-        ui.main_layout = main_view(engine.monitors.primary)
+        engine.ui.main_display = DisplayBox{window=engine.monitors.primary,fg_bg=style.root}
+        main_view(engine.ui.main_display)
 
         -- show unit views on unit displays
-        for id, monitor in pairs(engine.monitors.unit_displays) do
+        for i = 1, #engine.monitors.unit_displays do
-            table.insert(ui.unit_layouts, unit_view(monitor, id))
+            engine.ui.unit_displays[i] = DisplayBox{window=engine.monitors.unit_displays[i],fg_bg=style.root}
+            unit_view(engine.ui.unit_displays[i], i)
         end
 
         -- start flasher callback task
@@ -136,29 +135,22 @@ end
 
 -- close out the UI
 function renderer.close_ui()
-    -- report ui as not ready
-    engine.ui_ready = false
-
     -- stop blinking indicators
     flasher.clear()
 
-    if engine.ui_ready then
+    -- delete element trees
-        -- hide to stop animation callbacks
+    if engine.ui.main_display ~= nil then engine.ui.main_display.delete() end
-        ui.main_layout.hide()
+    for _, display in ipairs(engine.ui.unit_displays) do display.delete() end
-        for i = 1, #ui.unit_layouts do
+
-            ui.unit_layouts[i].hide()
+    -- report ui as not ready
-            engine.monitors.unit_displays[i].clear()
+    engine.ui_ready = false
-        end
-    else
-        -- clear unit displays
-        for i = 1, #ui.unit_layouts do
-            engine.monitors.unit_displays[i].clear()
-        end
-    end
 
     -- clear root UI elements
-    ui.main_layout = nil
+    engine.ui.main_display = nil
-    ui.unit_layouts = {}
+    engine.ui.unit_displays = {}
+
+    -- clear unit monitors
+    for _, monitor in ipairs(engine.monitors.unit_displays) do monitor.clear() end
 
     -- re-draw dmesg
     engine.dmesg_window.setVisible(true)
@@ -171,15 +163,17 @@ end
 function renderer.ui_ready() return engine.ui_ready end
 
 -- handle a touch event
----@param event monitor_touch
+---@param event mouse_interaction|nil
-function renderer.handle_touch(event)
+function renderer.handle_mouse(event)
-    if event.monitor == engine.monitors.primary_name then
+    if engine.ui_ready and event ~= nil then
-        ui.main_layout.handle_touch(event)
+        if event.monitor == engine.monitors.primary_name then
-    else
+            engine.ui.main_display.handle_mouse(event)
-        for id, monitor in pairs(engine.monitors.unit_name_map) do
+        else
-            if event.monitor == monitor then
+            for id, monitor in ipairs(engine.monitors.unit_name_map) do
-                local layout = ui.unit_layouts[id]  ---@type graphics_element
+                if event.monitor == monitor then
-                layout.handle_touch(event)
+                    local layout = engine.ui.unit_displays[id]  ---@type graphics_element
+                    layout.handle_mouse(event)
+                end
             end
         end
     end

coordinator/session/api.lua

@@ -0,0 +1,251 @@
+local comms  = require("scada-common.comms")
+local log    = require("scada-common.log")
+local mqueue = require("scada-common.mqueue")
+local util   = require("scada-common.util")
+
+local api = {}
+
+local PROTOCOL = comms.PROTOCOL
+-- local CAPI_TYPE = comms.CAPI_TYPE
+local SCADA_MGMT_TYPE = comms.SCADA_MGMT_TYPE
+
+local println = util.println
+
+-- retry time constants in ms
+-- local INITIAL_WAIT = 1500
+-- local RETRY_PERIOD = 1000
+
+local API_S_CMDS = {
+}
+
+local API_S_DATA = {
+}
+
+api.API_S_CMDS = API_S_CMDS
+api.API_S_DATA = API_S_DATA
+
+local PERIODICS = {
+    KEEP_ALIVE = 2000
+}
+
+-- pocket API session
+---@nodiscard
+---@param id integer session ID
+---@param in_queue mqueue in message queue
+---@param out_queue mqueue out message queue
+---@param timeout number communications timeout
+function api.new_session(id, in_queue, out_queue, timeout)
+    local log_header = "api_session(" .. id .. "): "
+
+    local self = {
+        -- connection properties
+        seq_num = 0,
+        r_seq_num = nil,
+        connected = true,
+        conn_watchdog = util.new_watchdog(timeout),
+        last_rtt = 0,
+        -- periodic messages
+        periodics = {
+            last_update = 0,
+            keep_alive = 0
+        },
+        -- when to next retry one of these requests
+        retry_times = {
+        },
+        -- command acknowledgements
+        acks = {
+        },
+        -- session database
+        ---@class api_db
+        sDB = {
+        }
+    }
+
+    ---@class api_session
+    local public = {}
+
+    -- mark this API session as closed, stop watchdog
+    local function _close()
+        self.conn_watchdog.cancel()
+        self.connected = false
+    end
+
+    -- send a CAPI packet
+    -----@param msg_type CAPI_TYPE
+    -----@param msg table
+    -- local function _send(msg_type, msg)
+    --     local s_pkt = comms.scada_packet()
+    --     local c_pkt = comms.capi_packet()
+
+    --     c_pkt.make(msg_type, msg)
+    --     s_pkt.make(self.seq_num, PROTOCOL.COORD_API, c_pkt.raw_sendable())
+
+    --     out_queue.push_packet(s_pkt)
+    --     self.seq_num = self.seq_num + 1
+    -- end
+
+    -- send a SCADA management packet
+    ---@param msg_type SCADA_MGMT_TYPE
+    ---@param msg table
+    local function _send_mgmt(msg_type, msg)
+        local s_pkt = comms.scada_packet()
+        local m_pkt = comms.mgmt_packet()
+
+        m_pkt.make(msg_type, msg)
+        s_pkt.make(self.seq_num, PROTOCOL.SCADA_MGMT, m_pkt.raw_sendable())
+
+        out_queue.push_packet(s_pkt)
+        self.seq_num = self.seq_num + 1
+    end
+
+    -- handle a packet
+    ---@param pkt mgmt_frame|capi_frame
+    local function _handle_packet(pkt)
+        -- check sequence number
+        if self.r_seq_num == nil then
+            self.r_seq_num = pkt.scada_frame.seq_num()
+        elseif (self.r_seq_num + 1) ~= pkt.scada_frame.seq_num() then
+            log.warning(log_header .. "sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. pkt.scada_frame.seq_num())
+            return
+        else
+            self.r_seq_num = pkt.scada_frame.seq_num()
+        end
+
+        -- feed watchdog
+        self.conn_watchdog.feed()
+
+        -- process packet
+        if pkt.scada_frame.protocol() == PROTOCOL.COORD_API then
+            ---@cast pkt capi_frame
+            -- feed watchdog
+            self.conn_watchdog.feed()
+
+            -- handle packet by type
+            if pkt.type == nil then
+            else
+                log.debug(log_header .. "handler received unsupported CAPI packet type " .. pkt.type)
+            end
+        elseif pkt.scada_frame.protocol() == PROTOCOL.SCADA_MGMT then
+            ---@cast pkt mgmt_frame
+            if pkt.type == SCADA_MGMT_TYPE.KEEP_ALIVE then
+                -- keep alive reply
+                if pkt.length == 2 then
+                    local srv_start = pkt.data[1]
+                    -- local api_send = pkt.data[2]
+                    local srv_now = util.time()
+                    self.last_rtt = srv_now - srv_start
+
+                    if self.last_rtt > 750 then
+                        log.warning(log_header .. "API KEEP_ALIVE round trip time > 750ms (" .. self.last_rtt .. "ms)")
+                    end
+
+                    -- log.debug(log_header .. "API RTT = " .. self.last_rtt .. "ms")
+                    -- log.debug(log_header .. "API TT  = " .. (srv_now - api_send) .. "ms")
+                else
+                    log.debug(log_header .. "SCADA keep alive packet length mismatch")
+                end
+            elseif pkt.type == SCADA_MGMT_TYPE.CLOSE then
+                -- close the session
+                _close()
+            else
+                log.debug(log_header .. "handler received unsupported SCADA_MGMT packet type " .. pkt.type)
+            end
+        end
+    end
+
+    -- PUBLIC FUNCTIONS --
+
+    -- get the session ID
+    ---@nodiscard
+    function public.get_id() return id end
+
+    -- get the session database
+    ---@nodiscard
+    function public.get_db() return self.sDB end
+
+    -- check if a timer matches this session's watchdog
+    ---@nodiscard
+    function public.check_wd(timer)
+        return self.conn_watchdog.is_timer(timer) and self.connected
+    end
+
+    -- close the connection
+    function public.close()
+        _close()
+        _send_mgmt(SCADA_MGMT_TYPE.CLOSE, {})
+        println("connection to API session " .. id .. " closed by server")
+        log.info(log_header .. "session closed by server")
+    end
+
+    -- iterate the session
+    ---@nodiscard
+    ---@return boolean connected
+    function public.iterate()
+        if self.connected then
+            ------------------
+            -- handle queue --
+            ------------------
+
+            local handle_start = util.time()
+
+            while in_queue.ready() and self.connected do
+                -- get a new message to process
+                local message = in_queue.pop()
+
+                if message ~= nil then
+                    if message.qtype == mqueue.TYPE.PACKET then
+                        -- handle a packet
+                        _handle_packet(message.message)
+                    elseif message.qtype == mqueue.TYPE.COMMAND then
+                        -- handle instruction
+                    elseif message.qtype == mqueue.TYPE.DATA then
+                        -- instruction with body
+                    end
+                end
+
+                -- max 100ms spent processing queue
+                if util.time() - handle_start > 100 then
+                    log.warning(log_header .. "exceeded 100ms queue process limit")
+                    break
+                end
+            end
+
+            -- exit if connection was closed
+            if not self.connected then
+                println("connection to API session " .. id .. " closed by remote host")
+                log.info(log_header .. "session closed by remote host")
+                return self.connected
+            end
+
+            ----------------------
+            -- update periodics --
+            ----------------------
+
+            local elapsed = util.time() - self.periodics.last_update
+
+            local periodics = self.periodics
+
+            -- keep alive
+
+            periodics.keep_alive = periodics.keep_alive + elapsed
+            if periodics.keep_alive >= PERIODICS.KEEP_ALIVE then
+                _send_mgmt(SCADA_MGMT_TYPE.KEEP_ALIVE, { util.time() })
+                periodics.keep_alive = 0
+            end
+
+            self.periodics.last_update = util.time()
+
+            ---------------------
+            -- attempt retries --
+            ---------------------
+
+            -- local rtimes = self.retry_times
+        end
+
+        return self.connected
+    end
+
+    return public
+end
+
+return api

coordinator/session/apisessions.lua

@@ -0,0 +1,174 @@
+
+local log    = require("scada-common.log")
+local mqueue = require("scada-common.mqueue")
+local util   = require("scada-common.util")
+
+local config = require("coordinator.config")
+
+local api    = require("coordinator.session.api")
+
+local apisessions = {}
+
+local self = {
+    modem = nil,
+    next_id = 0,
+    sessions = {}
+}
+
+-- PRIVATE FUNCTIONS --
+
+-- handle a session output queue
+---@param session api_session_struct
+local function _api_handle_outq(session)
+    -- record handler start time
+    local handle_start = util.time()
+
+    -- process output queue
+    while session.out_queue.ready() do
+        -- get a new message to process
+        local msg = session.out_queue.pop()
+
+        if msg ~= nil then
+            if msg.qtype == mqueue.TYPE.PACKET then
+                -- handle a packet to be sent
+                self.modem.transmit(session.r_port, session.l_port, msg.message.raw_sendable())
+            elseif msg.qtype == mqueue.TYPE.COMMAND then
+                -- handle instruction/notification
+            elseif msg.qtype == mqueue.TYPE.DATA then
+                -- instruction/notification with body
+            end
+        end
+
+        -- max 100ms spent processing queue
+        if util.time() - handle_start > 100 then
+            log.warning("API out queue handler exceeded 100ms queue process limit")
+            log.warning(util.c("offending session: port ", session.r_port))
+            break
+        end
+    end
+end
+
+-- cleanly close a session
+---@param session api_session_struct
+local function _shutdown(session)
+    session.open = false
+    session.instance.close()
+
+    -- send packets in out queue (namely the close packet)
+    while session.out_queue.ready() do
+        local msg = session.out_queue.pop()
+        if msg ~= nil and msg.qtype == mqueue.TYPE.PACKET then
+            self.modem.transmit(session.r_port, session.l_port, msg.message.raw_sendable())
+        end
+    end
+
+    log.debug(util.c("closed API session ", session.instance.get_id(), " on remote port ", session.r_port))
+end
+
+-- PUBLIC FUNCTIONS --
+
+-- initialize apisessions
+---@param modem table
+function apisessions.init(modem)
+    self.modem = modem
+end
+
+-- re-link the modem
+---@param modem table
+function apisessions.relink_modem(modem)
+    self.modem = modem
+end
+
+-- find a session by remote port
+---@nodiscard
+---@param port integer
+---@return api_session_struct|nil
+function apisessions.find_session(port)
+    for i = 1, #self.sessions do
+        if self.sessions[i].r_port == port then return self.sessions[i] end
+    end
+    return nil
+end
+
+-- establish a new API session
+---@nodiscard
+---@param local_port integer
+---@param remote_port integer
+---@param version string
+---@return integer session_id
+function apisessions.establish_session(local_port, remote_port, version)
+    ---@class api_session_struct
+    local api_s = {
+        open = true,
+        version = version,
+        l_port = local_port,
+        r_port = remote_port,
+        in_queue = mqueue.new(),
+        out_queue = mqueue.new(),
+        instance = nil  ---@type api_session
+    }
+
+    api_s.instance = api.new_session(self.next_id, api_s.in_queue, api_s.out_queue, config.API_TIMEOUT)
+    table.insert(self.sessions, api_s)
+
+    log.debug(util.c("established new API session to ", remote_port, " with ID ", self.next_id))
+
+    self.next_id = self.next_id + 1
+
+    -- success
+    return api_s.instance.get_id()
+end
+
+-- attempt to identify which session's watchdog timer fired
+---@param timer_event number
+function apisessions.check_all_watchdogs(timer_event)
+    for i = 1, #self.sessions do
+        local session = self.sessions[i]  ---@type api_session_struct
+        if session.open then
+            local triggered = session.instance.check_wd(timer_event)
+            if triggered then
+                log.debug(util.c("watchdog closing API session ", session.instance.get_id(),
+                    " on remote port ", session.r_port, "..."))
+                _shutdown(session)
+            end
+        end
+    end
+end
+
+-- iterate all the API sessions
+function apisessions.iterate_all()
+    for i = 1, #self.sessions do
+        local session = self.sessions[i]    ---@type api_session_struct
+
+        if session.open and session.instance.iterate() then
+            _api_handle_outq(session)
+        else
+            session.open = false
+        end
+    end
+end
+
+-- delete all closed sessions
+function apisessions.free_all_closed()
+    local f = function (session) return session.open end
+
+    ---@param session api_session_struct
+    local on_delete = function (session)
+        log.debug(util.c("free'ing closed API session ", session.instance.get_id(),
+            " on remote port ", session.r_port))
+    end
+
+    util.filter_table(self.sessions, f, on_delete)
+end
+
+-- close all open connections
+function apisessions.close_all()
+    for i = 1, #self.sessions do
+        local session = self.sessions[i]  ---@type api_session_struct
+        if session.open then _shutdown(session) end
+    end
+
+    apisessions.free_all_closed()
+end
+
+return apisessions

coordinator/sounder.lua

@@ -12,10 +12,11 @@ local ALARM_STATE = types.ALARM_STATE
 ---@class sounder
 local sounder = {}
 
+-- note: max samples = 0x20000 (128 * 1024 samples)
+
 local _2_PI        = 2 * math.pi    -- 2 whole pies, hope you're hungry
 local _DRATE       = 48000          -- 48kHz audio
 local _MAX_VAL     = 127 / 2        -- max signed integer in this 8-bit audio
-local _MAX_SAMPLES = 0x20000        -- 128 * 1024 samples
 local _05s_SAMPLES = 24000          -- half a second worth of samples
 
 local test_alarms = { false, false, false, false, false, false, false, false, false, false, false, false }

coordinator/startup.lua

@@ -12,18 +12,17 @@ local util         = require("scada-common.util")
 
 local core         = require("graphics.core")
 
-local apisessions  = require("coordinator.apisessions")
 local config       = require("coordinator.config")
 local coordinator  = require("coordinator.coordinator")
 local iocontrol    = require("coordinator.iocontrol")
 local renderer     = require("coordinator.renderer")
 local sounder      = require("coordinator.sounder")
 
-local COORDINATOR_VERSION = "v0.12.2"
+local apisessions  = require("coordinator.session.apisessions")
+
+local COORDINATOR_VERSION = "v0.15.1"
 
-local print = util.print
 local println = util.println
-local print_ts = util.print_ts
 local println_ts = util.println_ts
 
 local log_graphics = coordinator.log_graphics
@@ -39,11 +38,13 @@ local log_comms_connecting = coordinator.log_comms_connecting
 local cfv = util.new_validator()
 
 cfv.assert_port(config.SCADA_SV_PORT)
-cfv.assert_port(config.SCADA_SV_LISTEN)
+cfv.assert_port(config.SCADA_SV_CTL_LISTEN)
 cfv.assert_port(config.SCADA_API_LISTEN)
 cfv.assert_type_int(config.TRUSTED_RANGE)
-cfv.assert_type_num(config.COMMS_TIMEOUT)
+cfv.assert_type_num(config.SV_TIMEOUT)
-cfv.assert_min(config.COMMS_TIMEOUT, 2)
+cfv.assert_min(config.SV_TIMEOUT, 2)
+cfv.assert_type_num(config.API_TIMEOUT)
+cfv.assert_min(config.API_TIMEOUT, 2)
 cfv.assert_type_int(config.NUM_UNITS)
 cfv.assert_type_num(config.SOUNDER_VOLUME)
 cfv.assert_type_bool(config.TIME_24_HOUR)
@@ -56,7 +57,7 @@ assert(cfv.valid(), "bad config file: missing/invalid fields")
 -- log init
 ----------------------------------------
 
-log.init(config.LOG_PATH, config.LOG_MODE)
+log.init(config.LOG_PATH, config.LOG_MODE, config.LOG_DEBUG == true)
 
 log.info("========================================")
 log.info("BOOTING coordinator.startup " .. COORDINATOR_VERSION)
@@ -142,12 +143,12 @@ local function main()
     end
 
     -- create connection watchdog
-    local conn_watchdog = util.new_watchdog(config.COMMS_TIMEOUT)
+    local conn_watchdog = util.new_watchdog(config.SV_TIMEOUT)
     conn_watchdog.cancel()
     log.debug("startup> conn watchdog created")
 
     -- start comms, open all channels
-    local coord_comms = coordinator.comms(COORDINATOR_VERSION, modem, config.SCADA_SV_PORT, config.SCADA_SV_LISTEN,
+    local coord_comms = coordinator.comms(COORDINATOR_VERSION, modem, config.SCADA_SV_PORT, config.SCADA_SV_CTL_LISTEN,
                                             config.SCADA_API_LISTEN, config.TRUSTED_RANGE, conn_watchdog)
     log.debug("startup> comms init")
     log_comms("comms initialized")
@@ -287,7 +288,7 @@ local function main()
                     else
                         log_sys("wired modem reconnected")
                     end
-                elseif type == "monitor" then
+                -- elseif type == "monitor" then
                     -- not supported, system will exit on loss of in-use monitors
                 elseif type == "speaker" then
                     local msg = "alarm sounder speaker reconnected"
@@ -300,6 +301,9 @@ local function main()
             if loop_clock.is_clock(param1) then
                 -- main loop tick
 
+                -- iterate sessions
+                apisessions.iterate_all()
+
                 -- free any closed sessions
                 apisessions.free_all_closed()
 
@@ -326,7 +330,7 @@ local function main()
             else
                 -- a non-clock/main watchdog timer event
 
-                --check API watchdogs
+                -- check API watchdogs
                 apisessions.check_all_watchdogs(param1)
 
                 -- notify timer callback dispatcher
@@ -354,7 +358,7 @@ local function main()
             end
         elseif event == "monitor_touch" then
             -- handle a monitor touch event
-            renderer.handle_touch(core.events.touch(param1, param2, param3))
+            renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))
         elseif event == "speaker_audio_empty" then
             -- handle speaker buffer emptied
             sounder.continue()
@@ -385,4 +389,6 @@ if not xpcall(main, crash.handler) then
     pcall(renderer.close_ui)
     pcall(sounder.stop)
     crash.exit()
+else
+    log.close()
 end

coordinator/ui/components/boiler.lua

@@ -9,8 +9,8 @@ local DataIndicator  = require("graphics.elements.indicators.data")
 local StateIndicator = require("graphics.elements.indicators.state")
 local VerticalBar    = require("graphics.elements.indicators.vbar")
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
-local border = core.graphics.border
+local border = core.border
 
 -- new boiler view
 ---@param root graphics_element parent
@@ -27,9 +27,9 @@ local function new_view(root, x, y, ps)
     local temp   = DataIndicator{parent=boiler,x=5,y=3,lu_colors=lu_col,label="Temp:",unit="K",format="%10.2f",value=0,width=22,fg_bg=text_fg_bg}
     local boil_r = DataIndicator{parent=boiler,x=5,y=4,lu_colors=lu_col,label="Boil:",unit="mB/t",format="%10.0f",value=0,commas=true,width=22,fg_bg=text_fg_bg}
 
-    ps.subscribe("computed_status", status.update)
+    status.register(ps, "computed_status", status.update)
-    ps.subscribe("temperature", temp.update)
+    temp.register(ps, "temperature", temp.update)
-    ps.subscribe("boil_rate", boil_r.update)
+    boil_r.register(ps, "boil_rate", boil_r.update)
 
     TextBox{parent=boiler,text="H",x=2,y=5,height=1,width=1,fg_bg=text_fg_bg}
     TextBox{parent=boiler,text="W",x=3,y=5,height=1,width=1,fg_bg=text_fg_bg}
@@ -41,10 +41,10 @@ local function new_view(root, x, y, ps)
     local steam = VerticalBar{parent=boiler,x=27,y=1,fg_bg=cpair(colors.white,colors.gray),height=4,width=1}
     local ccool = VerticalBar{parent=boiler,x=28,y=1,fg_bg=cpair(colors.lightBlue,colors.gray),height=4,width=1}
 
-    ps.subscribe("hcool_fill", hcool.update)
+    hcool.register(ps, "hcool_fill", hcool.update)
-    ps.subscribe("water_fill", water.update)
+    water.register(ps, "water_fill", water.update)
-    ps.subscribe("steam_fill", steam.update)
+    steam.register(ps, "steam_fill", steam.update)
-    ps.subscribe("ccool_fill", ccool.update)
+    ccool.register(ps, "ccool_fill", ccool.update)
 end
 
 return new_view

coordinator/ui/components/imatrix.lua

@@ -13,10 +13,10 @@ local PowerIndicator = require("graphics.elements.indicators.power")
 local StateIndicator = require("graphics.elements.indicators.state")
 local VerticalBar    = require("graphics.elements.indicators.vbar")
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
-local border = core.graphics.border
+local border = core.border
 
-local TEXT_ALIGN = core.graphics.TEXT_ALIGN
+local TEXT_ALIGN = core.TEXT_ALIGN
 
 -- new induction matrix view
 ---@param root graphics_element parent
@@ -50,15 +50,15 @@ local function new_view(root, x, y, data, ps, id)
     local avg_in   = PowerIndicator{parent=rect,x=7,y=9,lu_colors=lu_col,label="Avg. In: ",format="%8.2f",rate=true,value=0,width=26,fg_bg=text_fg_bg}
     local avg_out  = PowerIndicator{parent=rect,x=7,y=10,lu_colors=lu_col,label="Avg. Out:",format="%8.2f",rate=true,value=0,width=26,fg_bg=text_fg_bg}
 
-    ps.subscribe("computed_status", status.update)
+    status.register(ps, "computed_status", status.update)
-    ps.subscribe("energy", function (val) energy.update(util.joules_to_fe(val)) end)
+    energy.register(ps, "energy", function (val) energy.update(util.joules_to_fe(val)) end)
-    ps.subscribe("max_energy", function (val) capacity.update(util.joules_to_fe(val)) end)
+    capacity.register(ps, "max_energy", function (val) capacity.update(util.joules_to_fe(val)) end)
-    ps.subscribe("last_input", function (val) input.update(util.joules_to_fe(val)) end)
+    input.register(ps, "last_input", function (val) input.update(util.joules_to_fe(val)) end)
-    ps.subscribe("last_output", function (val) output.update(util.joules_to_fe(val)) end)
+    output.register(ps, "last_output", function (val) output.update(util.joules_to_fe(val)) end)
 
-    ps.subscribe("avg_charge", avg_chg.update)
+    avg_chg.register(ps, "avg_charge", avg_chg.update)
-    ps.subscribe("avg_inflow", avg_in.update)
+    avg_in.register(ps, "avg_inflow", avg_in.update)
-    ps.subscribe("avg_outflow", avg_out.update)
+    avg_out.register(ps, "avg_outflow", avg_out.update)
 
     local fill      = DataIndicator{parent=rect,x=11,y=12,lu_colors=lu_col,label="Fill:",unit="%",format="%8.2f",value=0,width=18,fg_bg=text_fg_bg}
 
@@ -68,10 +68,10 @@ local function new_view(root, x, y, data, ps, id)
     TextBox{parent=rect,text="Transfer Capacity",x=11,y=17,height=1,width=17,fg_bg=label_fg_bg}
     local trans_cap = PowerIndicator{parent=rect,x=19,y=18,lu_colors=lu_col,label="",format="%5.2f",rate=true,value=0,width=12,fg_bg=text_fg_bg}
 
-    ps.subscribe("cells", cells.update)
+    cells.register(ps, "cells", cells.update)
-    ps.subscribe("providers", providers.update)
+    providers.register(ps, "providers", providers.update)
-    ps.subscribe("energy_fill", function (val) fill.update(val * 100) end)
+    fill.register(ps, "energy_fill", function (val) fill.update(val * 100) end)
-    ps.subscribe("transfer_cap", function (val) trans_cap.update(util.joules_to_fe(val)) end)
+    trans_cap.register(ps, "transfer_cap", function (val) trans_cap.update(util.joules_to_fe(val)) end)
 
     local charge  = VerticalBar{parent=rect,x=2,y=2,fg_bg=cpair(colors.green,colors.gray),height=17,width=4}
     local in_cap  = VerticalBar{parent=rect,x=7,y=12,fg_bg=cpair(colors.red,colors.gray),height=7,width=1}
@@ -88,9 +88,9 @@ local function new_view(root, x, y, data, ps, id)
         end
     end
 
-    ps.subscribe("energy_fill", charge.update)
+    charge.register(ps, "energy_fill", charge.update)
-    ps.subscribe("last_input", function (val) in_cap.update(calc_saturation(val)) end)
+    in_cap.register(ps, "last_input", function (val) in_cap.update(calc_saturation(val)) end)
-    ps.subscribe("last_output", function (val) out_cap.update(calc_saturation(val)) end)
+    out_cap.register(ps, "last_output", function (val) out_cap.update(calc_saturation(val)) end)
 end
 
 return new_view

coordinator/ui/components/processctl.lua

@@ -21,10 +21,10 @@ local HazardButton      = require("graphics.elements.controls.hazard_button")
 local RadioButton       = require("graphics.elements.controls.radio_button")
 local SpinboxNumeric    = require("graphics.elements.controls.spinbox_numeric")
 
-local TEXT_ALIGN = core.graphics.TEXT_ALIGN
+local TEXT_ALIGN = core.TEXT_ALIGN
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
-local border = core.graphics.border
+local border = core.border
 
 local period = core.flasher.PERIOD
 
@@ -55,9 +55,9 @@ local function new_view(root, x, y)
     local ind_mat = IndicatorLight{parent=main,label="Induction Matrix",colors=cpair(colors.green,colors.gray)}
     local rad_mon = TriIndicatorLight{parent=main,label="Radiation Monitor",c1=colors.gray,c2=colors.yellow,c3=colors.green}
 
-    facility.ps.subscribe("all_sys_ok", all_ok.update)
+    all_ok.register(facility.ps, "all_sys_ok", all_ok.update)
-    facility.induction_ps_tbl[1].subscribe("computed_status", function (status) ind_mat.update(status > 1) end)
+    ind_mat.register(facility.induction_ps_tbl[1], "computed_status", function (status) ind_mat.update(status > 1) end)
-    facility.ps.subscribe("rad_computed_status", rad_mon.update)
+    rad_mon.register(facility.ps, "rad_computed_status", rad_mon.update)
 
     main.line_break()
 
@@ -66,10 +66,10 @@ local function new_view(root, x, y)
     local auto_ramp  = IndicatorLight{parent=main,label="Process Ramping",colors=cpair(colors.white,colors.gray),flash=true,period=period.BLINK_250_MS}
     local auto_sat   = IndicatorLight{parent=main,label="Min/Max Burn Rate",colors=cpair(colors.yellow,colors.gray)}
 
-    facility.ps.subscribe("auto_ready", auto_ready.update)
+    auto_ready.register(facility.ps, "auto_ready", auto_ready.update)
-    facility.ps.subscribe("auto_active", auto_act.update)
+    auto_act.register(facility.ps, "auto_active", auto_act.update)
-    facility.ps.subscribe("auto_ramping", auto_ramp.update)
+    auto_ramp.register(facility.ps, "auto_ramping", auto_ramp.update)
-    facility.ps.subscribe("auto_saturated", auto_sat.update)
+    auto_sat.register(facility.ps, "auto_saturated", auto_sat.update)
 
     main.line_break()
 
@@ -80,20 +80,20 @@ local function new_view(root, x, y)
     local fac_rad_h   = IndicatorLight{parent=main,label="Facility Radiation High",colors=cpair(colors.red,colors.gray),flash=true,period=period.BLINK_250_MS}
     local gen_fault   = IndicatorLight{parent=main,label="Gen. Control Fault",colors=cpair(colors.yellow,colors.gray),flash=true,period=period.BLINK_500_MS}
 
-    facility.ps.subscribe("auto_scram", auto_scram.update)
+    auto_scram.register(facility.ps, "auto_scram", auto_scram.update)
-    facility.ps.subscribe("as_matrix_dc", matrix_dc.update)
+    matrix_dc.register(facility.ps, "as_matrix_dc", matrix_dc.update)
-    facility.ps.subscribe("as_matrix_fill", matrix_fill.update)
+    matrix_fill.register(facility.ps, "as_matrix_fill", matrix_fill.update)
-    facility.ps.subscribe("as_crit_alarm", unit_crit.update)
+    unit_crit.register(facility.ps, "as_crit_alarm", unit_crit.update)
-    facility.ps.subscribe("as_radiation", fac_rad_h.update)
+    fac_rad_h.register(facility.ps, "as_radiation", fac_rad_h.update)
-    facility.ps.subscribe("as_gen_fault", gen_fault.update)
+    gen_fault.register(facility.ps, "as_gen_fault", gen_fault.update)
 
     TextBox{parent=main,y=23,text="Radiation",height=1,width=13,fg_bg=style.label}
     local radiation = RadIndicator{parent=main,label="",format="%9.3f",lu_colors=lu_cpair,width=13,fg_bg=bw_fg_bg}
-    facility.ps.subscribe("radiation", radiation.update)
+    radiation.register(facility.ps, "radiation", radiation.update)
 
     TextBox{parent=main,x=15,y=23,text="Linked RTUs",height=1,width=11,fg_bg=style.label}
     local rtu_count = DataIndicator{parent=main,x=15,y=24,label="",format="%11d",value=0,lu_colors=lu_cpair,width=11,fg_bg=bw_fg_bg}
-    facility.ps.subscribe("rtu_count", rtu_count.update)
+    rtu_count.register(facility.ps, "rtu_count", rtu_count.update)
 
     ---------------------
     -- process control --
@@ -115,8 +115,8 @@ local function new_view(root, x, y)
     TextBox{parent=burn_target,x=18,y=2,text="mB/t"}
     local burn_sum = DataIndicator{parent=targets,x=9,y=4,label="",format="%18.1f",value=0,unit="mB/t",commas=true,lu_colors=cpair(colors.black,colors.black),width=23,fg_bg=cpair(colors.black,colors.brown)}
 
-    facility.ps.subscribe("process_burn_target", b_target.set_value)
+    b_target.register(facility.ps, "process_burn_target", b_target.set_value)
-    facility.ps.subscribe("burn_sum", burn_sum.update)
+    burn_sum.register(facility.ps, "burn_sum", burn_sum.update)
 
     local chg_tag = Div{parent=targets,x=1,y=6,width=8,height=4,fg_bg=cpair(colors.black,colors.purple)}
     TextBox{parent=chg_tag,x=2,y=2,text="Charge Target",width=7,height=2}
@@ -126,8 +126,8 @@ local function new_view(root, x, y)
     TextBox{parent=chg_target,x=18,y=2,text="MFE"}
     local cur_charge = DataIndicator{parent=targets,x=9,y=9,label="",format="%19d",value=0,unit="MFE",commas=true,lu_colors=cpair(colors.black,colors.black),width=23,fg_bg=cpair(colors.black,colors.brown)}
 
-    facility.ps.subscribe("process_charge_target", c_target.set_value)
+    c_target.register(facility.ps, "process_charge_target", c_target.set_value)
-    facility.induction_ps_tbl[1].subscribe("energy", function (j) cur_charge.update(util.joules_to_fe(j) / 1000000) end)
+    cur_charge.register(facility.induction_ps_tbl[1], "energy", function (j) cur_charge.update(util.joules_to_fe(j) / 1000000) end)
 
     local gen_tag = Div{parent=targets,x=1,y=11,width=8,height=4,fg_bg=cpair(colors.black,colors.purple)}
     TextBox{parent=gen_tag,x=2,y=2,text="Gen. Target",width=7,height=2}
@@ -137,8 +137,8 @@ local function new_view(root, x, y)
     TextBox{parent=gen_target,x=18,y=2,text="kFE/t"}
     local cur_gen = DataIndicator{parent=targets,x=9,y=14,label="",format="%17d",value=0,unit="kFE/t",commas=true,lu_colors=cpair(colors.black,colors.black),width=23,fg_bg=cpair(colors.black,colors.brown)}
 
-    facility.ps.subscribe("process_gen_target", g_target.set_value)
+    g_target.register(facility.ps, "process_gen_target", g_target.set_value)
-    facility.induction_ps_tbl[1].subscribe("last_input", function (j) cur_gen.update(util.round(util.joules_to_fe(j) / 1000)) end)
+    cur_gen.register(facility.induction_ps_tbl[1], "last_input", function (j) cur_gen.update(util.round(util.joules_to_fe(j) / 1000)) end)
 
     -----------------
     -- unit limits --
@@ -160,12 +160,12 @@ local function new_view(root, x, y)
         rate_limits[i] = SpinboxNumeric{parent=lim_ctl,x=2,y=1,whole_num_precision=4,fractional_precision=1,min=0.1,arrow_fg_bg=cpair(colors.gray,colors.white),fg_bg=bw_fg_bg}
         TextBox{parent=lim_ctl,x=9,y=2,text="mB/t",width=4,height=1}
 
-        unit.unit_ps.subscribe("max_burn", rate_limits[i].set_max)
+        rate_limits[i].register(unit.unit_ps, "max_burn", rate_limits[i].set_max)
-        unit.unit_ps.subscribe("burn_limit", rate_limits[i].set_value)
+        rate_limits[i].register(unit.unit_ps, "burn_limit", rate_limits[i].set_value)
 
         local cur_burn = DataIndicator{parent=limit_div,x=9,y=_y+3,label="",format="%7.1f",value=0,unit="mB/t",commas=false,lu_colors=cpair(colors.black,colors.black),width=14,fg_bg=cpair(colors.black,colors.brown)}
 
-        unit.unit_ps.subscribe("act_burn_rate", cur_burn.update)
+        cur_burn.register(unit.unit_ps, "act_burn_rate", cur_burn.update)
     end
 
     -------------------
@@ -186,8 +186,8 @@ local function new_view(root, x, y)
         local ready    = IndicatorLight{parent=lights,x=2,y=2,label="Ready",colors=cpair(colors.green,colors.gray)}
         local degraded = IndicatorLight{parent=lights,x=2,y=3,label="Degraded",colors=cpair(colors.red,colors.gray),flash=true,period=period.BLINK_250_MS}
 
-        unit.unit_ps.subscribe("U_AutoReady", ready.update)
+        ready.register(unit.unit_ps, "U_AutoReady", ready.update)
-        unit.unit_ps.subscribe("U_AutoDegraded", degraded.update)
+        degraded.register(unit.unit_ps, "U_AutoDegraded", degraded.update)
     end
 
     -------------------------
@@ -197,14 +197,14 @@ local function new_view(root, x, y)
     local ctl_opts = { "Monitored Max Burn", "Combined Burn Rate", "Charge Level", "Generation Rate" }
     local mode = RadioButton{parent=proc,x=34,y=1,options=ctl_opts,callback=function()end,radio_colors=cpair(colors.purple,colors.black),radio_bg=colors.gray}
 
-    facility.ps.subscribe("process_mode", mode.set_value)
+    mode.register(facility.ps, "process_mode", mode.set_value)
 
     local u_stat = Rectangle{parent=proc,border=border(1,colors.gray,true),thin=true,width=31,height=4,x=1,y=16,fg_bg=bw_fg_bg}
     local stat_line_1 = TextBox{parent=u_stat,x=1,y=1,text="UNKNOWN",width=31,height=1,alignment=TEXT_ALIGN.CENTER,fg_bg=bw_fg_bg}
     local stat_line_2 = TextBox{parent=u_stat,x=1,y=2,text="awaiting data...",width=31,height=1,alignment=TEXT_ALIGN.CENTER,fg_bg=cpair(colors.gray, colors.white)}
 
-    facility.ps.subscribe("status_line_1", stat_line_1.set_value)
+    stat_line_1.register(facility.ps, "status_line_1", stat_line_1.set_value)
-    facility.ps.subscribe("status_line_2", stat_line_2.set_value)
+    stat_line_2.register(facility.ps, "status_line_2", stat_line_2.set_value)
 
     local auto_controls = Div{parent=proc,x=1,y=20,width=31,height=5,fg_bg=cpair(colors.gray,colors.white)}
 
@@ -233,11 +233,14 @@ local function new_view(root, x, y)
         tcd.dispatch(0.2, function () save.on_response(ack) end)
     end
 
-    facility.ps.subscribe("auto_ready", function (ready)
+    start.register(facility.ps, "auto_ready", function (ready)
         if ready and (not facility.auto_active) then start.enable() else start.disable() end
     end)
 
-    facility.ps.subscribe("auto_active", function (active)
+    -- REGISTER_NOTE: for optimization/brevity, due to not deleting anything but the whole element tree when it comes
+    -- to the process control display and coordinator GUI as a whole, child elements will not directly be registered here
+    -- (preventing garbage collection until the parent 'proc' is deleted)
+    proc.register(facility.ps, "auto_active", function (active)
         if active then
             b_target.disable()
             c_target.disable()
@@ -246,9 +249,7 @@ local function new_view(root, x, y)
             mode.disable()
             start.disable()
 
-            for i = 1, #rate_limits do
+            for i = 1, #rate_limits do rate_limits[i].disable() end
-                rate_limits[i].disable()
-            end
         else
             b_target.enable()
             c_target.enable()
@@ -257,9 +258,7 @@ local function new_view(root, x, y)
             mode.enable()
             if facility.auto_ready then start.enable() end
 
-            for i = 1, #rate_limits do
+            for i = 1, #rate_limits do rate_limits[i].enable() end
-                rate_limits[i].enable()
-            end
         end
     end)
 end

coordinator/ui/components/reactor.lua

@@ -11,16 +11,15 @@ local DataIndicator  = require("graphics.elements.indicators.data")
 local HorizontalBar  = require("graphics.elements.indicators.hbar")
 local StateIndicator = require("graphics.elements.indicators.state")
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
-local border = core.graphics.border
+local border = core.border
 
 -- create new reactor view
 ---@param root graphics_element parent
 ---@param x integer top left x
 ---@param y integer top left y
----@param data reactor_db reactor data
 ---@param ps psil ps interface
-local function new_view(root, x, y, data, ps)
+local function new_view(root, x, y, ps)
     local reactor = Rectangle{parent=root,border=border(1, colors.gray, true),width=30,height=7,x=x,y=y}
 
     local text_fg_bg = cpair(colors.black, colors.lightGray)
@@ -31,10 +30,10 @@ local function new_view(root, x, y, data, ps)
     local burn_r    = DataIndicator{parent=reactor,x=2,y=4,lu_colors=lu_col,label="Burn Rate:",unit="mB/t",format="%10.2f",value=0,width=26,fg_bg=text_fg_bg}
     local heating_r = DataIndicator{parent=reactor,x=2,y=5,lu_colors=lu_col,label="Heating:",unit="mB/t",format="%12.0f",value=0,commas=true,width=26,fg_bg=text_fg_bg}
 
-    ps.subscribe("computed_status", status.update)
+    status.register(ps, "computed_status", status.update)
-    ps.subscribe("temp", core_temp.update)
+    core_temp.register(ps, "temp", core_temp.update)
-    ps.subscribe("act_burn_rate", burn_r.update)
+    burn_r.register(ps, "act_burn_rate", burn_r.update)
-    ps.subscribe("heating_rate", heating_r.update)
+    heating_r.register(ps, "heating_rate", heating_r.update)
 
     local reactor_fills = Rectangle{parent=root,border=border(1, colors.gray, true),width=24,height=7,x=(x + 29),y=y}
 
@@ -48,7 +47,7 @@ local function new_view(root, x, y, data, ps)
     local hcool = HorizontalBar{parent=reactor_fills,x=8,y=4,show_percent=true,bar_fg_bg=cpair(colors.white,colors.gray),height=1,width=14}
     local waste = HorizontalBar{parent=reactor_fills,x=8,y=5,show_percent=true,bar_fg_bg=cpair(colors.brown,colors.gray),height=1,width=14}
 
-    ps.subscribe("ccool_type", function (type)
+    ccool.register(ps, "ccool_type", function (type)
         if type == types.FLUID.SODIUM then
             ccool.recolor(cpair(colors.lightBlue, colors.gray))
         else
@@ -56,7 +55,7 @@ local function new_view(root, x, y, data, ps)
         end
     end)
 
-    ps.subscribe("hcool_type", function (type)
+    hcool.register(ps, "hcool_type", function (type)
         if type == types.FLUID.SUPERHEATED_SODIUM then
             hcool.recolor(cpair(colors.orange, colors.gray))
         else
@@ -64,10 +63,10 @@ local function new_view(root, x, y, data, ps)
         end
     end)
 
-    ps.subscribe("fuel_fill", fuel.update)
+    fuel.register(ps, "fuel_fill", fuel.update)
-    ps.subscribe("ccool_fill", ccool.update)
+    ccool.register(ps, "ccool_fill", ccool.update)
-    ps.subscribe("hcool_fill", hcool.update)
+    hcool.register(ps, "hcool_fill", hcool.update)
-    ps.subscribe("waste_fill", waste.update)
+    waste.register(ps, "waste_fill", waste.update)
 end
 
 return new_view

coordinator/ui/components/turbine.lua

@@ -12,8 +12,8 @@ local PowerIndicator = require("graphics.elements.indicators.power")
 local StateIndicator = require("graphics.elements.indicators.state")
 local VerticalBar    = require("graphics.elements.indicators.vbar")
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
-local border = core.graphics.border
+local border = core.border
 
 -- new turbine view
 ---@param root graphics_element parent
@@ -30,9 +30,9 @@ local function new_view(root, x, y, ps)
     local prod_rate = PowerIndicator{parent=turbine,x=5,y=3,lu_colors=lu_col,label="",format="%10.2f",value=0,rate=true,width=16,fg_bg=text_fg_bg}
     local flow_rate = DataIndicator{parent=turbine,x=5,y=4,lu_colors=lu_col,label="",unit="mB/t",format="%10.0f",value=0,commas=true,width=16,fg_bg=text_fg_bg}
 
-    ps.subscribe("computed_status", status.update)
+    status.register(ps, "computed_status", status.update)
-    ps.subscribe("prod_rate", function (val) prod_rate.update(util.joules_to_fe(val)) end)
+    prod_rate.register(ps, "prod_rate", function (val) prod_rate.update(util.joules_to_fe(val)) end)
-    ps.subscribe("flow_rate", flow_rate.update)
+    flow_rate.register(ps, "flow_rate", flow_rate.update)
 
     local steam  = VerticalBar{parent=turbine,x=2,y=1,fg_bg=cpair(colors.white,colors.gray),height=4,width=1}
     local energy = VerticalBar{parent=turbine,x=3,y=1,fg_bg=cpair(colors.green,colors.gray),height=4,width=1}
@@ -40,8 +40,8 @@ local function new_view(root, x, y, ps)
     TextBox{parent=turbine,text="S",x=2,y=5,height=1,width=1,fg_bg=text_fg_bg}
     TextBox{parent=turbine,text="E",x=3,y=5,height=1,width=1,fg_bg=text_fg_bg}
 
-    ps.subscribe("steam_fill", steam.update)
+    steam.register(ps, "steam_fill", steam.update)
-    ps.subscribe("energy_fill", energy.update)
+    energy.register(ps, "energy_fill", energy.update)
 end
 
 return new_view

coordinator/ui/components/unit_detail.lua

@@ -26,10 +26,10 @@ local PushButton        = require("graphics.elements.controls.push_button")
 local RadioButton       = require("graphics.elements.controls.radio_button")
 local SpinboxNumeric    = require("graphics.elements.controls.spinbox_numeric")
 
-local TEXT_ALIGN = core.graphics.TEXT_ALIGN
+local TEXT_ALIGN = core.TEXT_ALIGN
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
-local border = core.graphics.border
+local border = core.border
 
 local period = core.flasher.PERIOD
 
@@ -79,16 +79,16 @@ local function init(parent, id)
     -----------------------------
 
     local core_map = CoreMap{parent=main,x=2,y=3,reactor_l=18,reactor_w=18}
-    u_ps.subscribe("temp", core_map.update)
+    core_map.register(u_ps, "temp", core_map.update)
-    u_ps.subscribe("size", function (s) core_map.resize(s[1], s[2]) end)
+    core_map.register(u_ps, "size", function (s) core_map.resize(s[1], s[2]) end)
 
     TextBox{parent=main,x=12,y=22,text="Heating Rate",height=1,width=12,fg_bg=style.label}
     local heating_r = DataIndicator{parent=main,x=12,label="",format="%14.0f",value=0,unit="mB/t",commas=true,lu_colors=lu_cpair,width=19,fg_bg=bw_fg_bg}
-    u_ps.subscribe("heating_rate", heating_r.update)
+    heating_r.register(u_ps, "heating_rate", heating_r.update)
 
     TextBox{parent=main,x=12,y=25,text="Commanded Burn Rate",height=1,width=19,fg_bg=style.label}
     local burn_r = DataIndicator{parent=main,x=12,label="",format="%14.2f",value=0,unit="mB/t",lu_colors=lu_cpair,width=19,fg_bg=bw_fg_bg}
-    u_ps.subscribe("burn_rate", burn_r.update)
+    burn_r.register(u_ps, "burn_rate", burn_r.update)
 
     TextBox{parent=main,text="F",x=2,y=22,width=1,height=1,fg_bg=style.label}
     TextBox{parent=main,text="C",x=4,y=22,width=1,height=1,fg_bg=style.label}
@@ -102,12 +102,12 @@ local function init(parent, id)
     local hcool = VerticalBar{parent=main,x=8,y=23,fg_bg=cpair(colors.white,colors.gray),height=4,width=1}
     local waste = VerticalBar{parent=main,x=10,y=23,fg_bg=cpair(colors.brown,colors.gray),height=4,width=1}
 
-    u_ps.subscribe("fuel_fill", fuel.update)
+    fuel.register(u_ps, "fuel_fill", fuel.update)
-    u_ps.subscribe("ccool_fill", ccool.update)
+    ccool.register(u_ps, "ccool_fill", ccool.update)
-    u_ps.subscribe("hcool_fill", hcool.update)
+    hcool.register(u_ps, "hcool_fill", hcool.update)
-    u_ps.subscribe("waste_fill", waste.update)
+    waste.register(u_ps, "waste_fill", waste.update)
 
-    u_ps.subscribe("ccool_type", function (type)
+    ccool.register(u_ps, "ccool_type", function (type)
         if type == "mekanism:sodium" then
             ccool.recolor(cpair(colors.lightBlue, colors.gray))
         else
@@ -115,7 +115,7 @@ local function init(parent, id)
         end
     end)
 
-    u_ps.subscribe("hcool_type", function (type)
+    hcool.register(u_ps, "hcool_type", function (type)
         if type == "mekanism:superheated_sodium" then
             hcool.recolor(cpair(colors.orange, colors.gray))
         else
@@ -125,19 +125,19 @@ local function init(parent, id)
 
     TextBox{parent=main,x=32,y=22,text="Core Temp",height=1,width=9,fg_bg=style.label}
     local core_temp = DataIndicator{parent=main,x=32,label="",format="%11.2f",value=0,unit="K",lu_colors=lu_cpair,width=13,fg_bg=bw_fg_bg}
-    u_ps.subscribe("temp", core_temp.update)
+    core_temp.register(u_ps, "temp", core_temp.update)
 
     TextBox{parent=main,x=32,y=25,text="Burn Rate",height=1,width=9,fg_bg=style.label}
     local act_burn_r = DataIndicator{parent=main,x=32,label="",format="%8.2f",value=0,unit="mB/t",lu_colors=lu_cpair,width=13,fg_bg=bw_fg_bg}
-    u_ps.subscribe("act_burn_rate", act_burn_r.update)
+    act_burn_r.register(u_ps, "act_burn_rate", act_burn_r.update)
 
     TextBox{parent=main,x=32,y=28,text="Damage",height=1,width=6,fg_bg=style.label}
     local damage_p = DataIndicator{parent=main,x=32,label="",format="%11.0f",value=0,unit="%",lu_colors=lu_cpair,width=13,fg_bg=bw_fg_bg}
-    u_ps.subscribe("damage", damage_p.update)
+    damage_p.register(u_ps, "damage", damage_p.update)
 
     TextBox{parent=main,x=32,y=31,text="Radiation",height=1,width=21,fg_bg=style.label}
     local radiation = RadIndicator{parent=main,x=32,label="",format="%9.3f",lu_colors=lu_cpair,width=13,fg_bg=bw_fg_bg}
-    u_ps.subscribe("radiation", radiation.update)
+    radiation.register(u_ps, "radiation", radiation.update)
 
     -------------------
     -- system status --
@@ -147,8 +147,8 @@ local function init(parent, id)
     local stat_line_1 = TextBox{parent=u_stat,x=1,y=1,text="UNKNOWN",width=33,height=1,alignment=TEXT_ALIGN.CENTER,fg_bg=bw_fg_bg}
     local stat_line_2 = TextBox{parent=u_stat,x=1,y=2,text="awaiting data...",width=33,height=1,alignment=TEXT_ALIGN.CENTER,fg_bg=cpair(colors.gray, colors.white)}
 
-    u_ps.subscribe("U_StatusLine1", stat_line_1.set_value)
+    stat_line_1.register(u_ps, "U_StatusLine1", stat_line_1.set_value)
-    u_ps.subscribe("U_StatusLine2", stat_line_2.set_value)
+    stat_line_2.register(u_ps, "U_StatusLine2", stat_line_2.set_value)
 
     -----------------
     -- annunciator --
@@ -163,9 +163,9 @@ local function init(parent, id)
     local plc_hbeat  = IndicatorLight{parent=annunciator,label="PLC Heartbeat",colors=cpair(colors.white,colors.gray)}
     local rad_mon    = TriIndicatorLight{parent=annunciator,label="Radiation Monitor",c1=colors.gray,c2=colors.yellow,c3=colors.green}
 
-    u_ps.subscribe("PLCOnline", plc_online.update)
+    plc_online.register(u_ps, "PLCOnline", plc_online.update)
-    u_ps.subscribe("PLCHeartbeat", plc_hbeat.update)
+    plc_hbeat.register(u_ps, "PLCHeartbeat", plc_hbeat.update)
-    u_ps.subscribe("RadiationMonitor", rad_mon.update)
+    rad_mon.register(u_ps, "RadiationMonitor", rad_mon.update)
 
     annunciator.line_break()
 
@@ -173,8 +173,8 @@ local function init(parent, id)
     local r_active = IndicatorLight{parent=annunciator,label="Active",colors=cpair(colors.green,colors.gray)}
     local r_auto   = IndicatorLight{parent=annunciator,label="Automatic Control",colors=cpair(colors.white,colors.gray)}
 
-    u_ps.subscribe("status", r_active.update)
+    r_active.register(u_ps, "status", r_active.update)
-    u_ps.subscribe("AutoControl", r_auto.update)
+    r_auto.register(u_ps, "AutoControl", r_auto.update)
 
     -- main unit transient/warning annunciator panel
     local r_scram = IndicatorLight{parent=annunciator,label="Reactor SCRAM",colors=cpair(colors.red,colors.gray)}
@@ -190,18 +190,18 @@ local function init(parent, id)
     local r_wloc  = IndicatorLight{parent=annunciator,label="Waste Line Occlusion",colors=cpair(colors.yellow,colors.gray)}
     local r_hsrt  = IndicatorLight{parent=annunciator,label="Startup Rate High",colors=cpair(colors.yellow,colors.gray)}
 
-    u_ps.subscribe("ReactorSCRAM", r_scram.update)
+    r_scram.register(u_ps, "ReactorSCRAM", r_scram.update)
-    u_ps.subscribe("ManualReactorSCRAM", r_mscrm.update)
+    r_mscrm.register(u_ps, "ManualReactorSCRAM", r_mscrm.update)
-    u_ps.subscribe("AutoReactorSCRAM", r_ascrm.update)
+    r_ascrm.register(u_ps, "AutoReactorSCRAM", r_ascrm.update)
-    u_ps.subscribe("RadiationWarning", rad_wrn.update)
+    rad_wrn.register(u_ps, "RadiationWarning", rad_wrn.update)
-    u_ps.subscribe("RCPTrip", r_rtrip.update)
+    r_rtrip.register(u_ps, "RCPTrip", r_rtrip.update)
-    u_ps.subscribe("RCSFlowLow", r_cflow.update)
+    r_cflow.register(u_ps, "RCSFlowLow", r_cflow.update)
-    u_ps.subscribe("CoolantLevelLow", r_clow.update)
+    r_clow.register(u_ps, "CoolantLevelLow", r_clow.update)
-    u_ps.subscribe("ReactorTempHigh", r_temp.update)
+    r_temp.register(u_ps, "ReactorTempHigh", r_temp.update)
-    u_ps.subscribe("ReactorHighDeltaT", r_rhdt.update)
+    r_rhdt.register(u_ps, "ReactorHighDeltaT", r_rhdt.update)
-    u_ps.subscribe("FuelInputRateLow", r_firl.update)
+    r_firl.register(u_ps, "FuelInputRateLow", r_firl.update)
-    u_ps.subscribe("WasteLineOcclusion", r_wloc.update)
+    r_wloc.register(u_ps, "WasteLineOcclusion", r_wloc.update)
-    u_ps.subscribe("HighStartupRate", r_hsrt.update)
+    r_hsrt.register(u_ps, "HighStartupRate", r_hsrt.update)
 
     -- RPS annunciator panel
 
@@ -220,23 +220,23 @@ local function init(parent, id)
     local rps_tmo = IndicatorLight{parent=rps_annunc,label="Connection Timeout",colors=cpair(colors.yellow,colors.gray),flash=true,period=period.BLINK_500_MS}
     local rps_sfl = IndicatorLight{parent=rps_annunc,label="System Failure",colors=cpair(colors.orange,colors.gray),flash=true,period=period.BLINK_500_MS}
 
-    u_ps.subscribe("rps_tripped", rps_trp.update)
+    rps_trp.register(u_ps, "rps_tripped", rps_trp.update)
-    u_ps.subscribe("high_dmg", rps_dmg.update)
+    rps_dmg.register(u_ps, "high_dmg", rps_dmg.update)
-    u_ps.subscribe("ex_hcool", rps_exh.update)
+    rps_exh.register(u_ps, "ex_hcool", rps_exh.update)
-    u_ps.subscribe("ex_waste", rps_exw.update)
+    rps_exw.register(u_ps, "ex_waste", rps_exw.update)
-    u_ps.subscribe("high_temp", rps_tmp.update)
+    rps_tmp.register(u_ps, "high_temp", rps_tmp.update)
-    u_ps.subscribe("no_fuel", rps_nof.update)
+    rps_nof.register(u_ps, "no_fuel", rps_nof.update)
-    u_ps.subscribe("low_cool", rps_loc.update)
+    rps_loc.register(u_ps, "low_cool", rps_loc.update)
-    u_ps.subscribe("fault", rps_flt.update)
+    rps_flt.register(u_ps, "fault", rps_flt.update)
-    u_ps.subscribe("timeout", rps_tmo.update)
+    rps_tmo.register(u_ps, "timeout", rps_tmo.update)
-    u_ps.subscribe("sys_fail", rps_sfl.update)
+    rps_sfl.register(u_ps, "sys_fail", rps_sfl.update)
 
     -- cooling annunciator panel
 
     TextBox{parent=main,text="REACTOR COOLANT SYSTEM",fg_bg=cpair(colors.black,colors.blue),alignment=TEXT_ALIGN.CENTER,width=33,height=1,x=46,y=22}
     local rcs = Rectangle{parent=main,border=border(1,colors.blue,true),thin=true,width=33,height=24,x=46,y=23}
-    local rcs_annunc = Div{parent=rcs,width=27,height=23,x=2,y=1}
+    local rcs_annunc = Div{parent=rcs,width=27,height=22,x=3,y=1}
-    local rcs_tags = Div{parent=rcs,width=2,height=14,x=29,y=9}
+    local rcs_tags = Div{parent=rcs,width=2,height=16,x=1,y=7}
 
     local c_flt  = IndicatorLight{parent=rcs_annunc,label="RCS Hardware Fault",colors=cpair(colors.yellow,colors.gray)}
     local c_emg  = TriIndicatorLight{parent=rcs_annunc,label="Emergency Coolant",c1=colors.gray,c2=colors.white,c3=colors.green}
@@ -244,86 +244,112 @@ local function init(parent, id)
     local c_brm  = IndicatorLight{parent=rcs_annunc,label="Boil Rate Mismatch",colors=cpair(colors.yellow,colors.gray)}
     local c_sfm  = IndicatorLight{parent=rcs_annunc,label="Steam Feed Mismatch",colors=cpair(colors.yellow,colors.gray)}
     local c_mwrf = IndicatorLight{parent=rcs_annunc,label="Max Water Return Feed",colors=cpair(colors.yellow,colors.gray)}
-    local c_tbnt = IndicatorLight{parent=rcs_annunc,label="Turbine Trip",colors=cpair(colors.red,colors.gray),flash=true,period=period.BLINK_250_MS}
 
-    u_ps.subscribe("RCSFault", c_flt.update)
+    c_flt.register(u_ps, "RCSFault", c_flt.update)
-    u_ps.subscribe("EmergencyCoolant", c_emg.update)
+    c_emg.register(u_ps, "EmergencyCoolant", c_emg.update)
-    u_ps.subscribe("CoolantFeedMismatch", c_cfm.update)
+    c_cfm.register(u_ps, "CoolantFeedMismatch", c_cfm.update)
-    u_ps.subscribe("BoilRateMismatch", c_brm.update)
+    c_brm.register(u_ps, "BoilRateMismatch", c_brm.update)
-    u_ps.subscribe("SteamFeedMismatch", c_sfm.update)
+    c_sfm.register(u_ps, "SteamFeedMismatch", c_sfm.update)
-    u_ps.subscribe("MaxWaterReturnFeed", c_mwrf.update)
+    c_mwrf.register(u_ps, "MaxWaterReturnFeed", c_mwrf.update)
-    u_ps.subscribe("TurbineTrip", c_tbnt.update)
 
-    rcs_annunc.line_break()
+    local available_space = 16 - (unit.num_boilers * 2 + unit.num_turbines * 4)
+
+    local function _add_space()
+        -- if we have some extra space, add padding
+        rcs_tags.line_break()
+        rcs_annunc.line_break()
+    end
 
     -- boiler annunciator panel(s)
 
+    if available_space > 0 then _add_space() end
+
     if unit.num_boilers > 0 then
         TextBox{parent=rcs_tags,x=1,text="B1",width=2,height=1,fg_bg=bw_fg_bg}
         local b1_wll = IndicatorLight{parent=rcs_annunc,label="Water Level Low",colors=cpair(colors.red,colors.gray)}
-        b_ps[1].subscribe("WasterLevelLow", b1_wll.update)
+        b1_wll.register(b_ps[1], "WasterLevelLow", b1_wll.update)
 
         TextBox{parent=rcs_tags,text="B1",width=2,height=1,fg_bg=bw_fg_bg}
         local b1_hr = IndicatorLight{parent=rcs_annunc,label="Heating Rate Low",colors=cpair(colors.yellow,colors.gray)}
-        b_ps[1].subscribe("HeatingRateLow", b1_hr.update)
+        b1_hr.register(b_ps[1], "HeatingRateLow", b1_hr.update)
     end
     if unit.num_boilers > 1 then
+        -- note, can't (shouldn't for sure...) have 0 turbines
+        if (available_space > 2 and unit.num_turbines == 1) or
+           (available_space > 3 and unit.num_turbines == 2) or
+           (available_space > 4) then
+            _add_space()
+        end
+
         TextBox{parent=rcs_tags,text="B2",width=2,height=1,fg_bg=bw_fg_bg}
         local b2_wll = IndicatorLight{parent=rcs_annunc,label="Water Level Low",colors=cpair(colors.red,colors.gray)}
-        b_ps[2].subscribe("WasterLevelLow", b2_wll.update)
+        b2_wll.register(b_ps[2], "WasterLevelLow", b2_wll.update)
 
         TextBox{parent=rcs_tags,text="B2",width=2,height=1,fg_bg=bw_fg_bg}
         local b2_hr = IndicatorLight{parent=rcs_annunc,label="Heating Rate Low",colors=cpair(colors.yellow,colors.gray)}
-        b_ps[2].subscribe("HeatingRateLow", b2_hr.update)
+        b2_hr.register(b_ps[2], "HeatingRateLow", b2_hr.update)
     end
 
     -- turbine annunciator panels
 
-    if unit.num_boilers == 0 then
+    if available_space > 1 then _add_space() end
-        TextBox{parent=rcs_tags,text="T1",width=2,height=1,fg_bg=bw_fg_bg}
-    else
-        rcs_tags.line_break()
-        rcs_annunc.line_break()
-        TextBox{parent=rcs_tags,text="T1",width=2,height=1,fg_bg=bw_fg_bg}
-    end
 
+    TextBox{parent=rcs_tags,text="T1",width=2,height=1,fg_bg=bw_fg_bg}
     local t1_sdo = TriIndicatorLight{parent=rcs_annunc,label="Steam Relief Valve Open",c1=colors.gray,c2=colors.yellow,c3=colors.red}
-    t_ps[1].subscribe("SteamDumpOpen", t1_sdo.update)
+    t1_sdo.register(t_ps[1], "SteamDumpOpen", t1_sdo.update)
 
     TextBox{parent=rcs_tags,text="T1",width=2,height=1,fg_bg=bw_fg_bg}
     local t1_tos = IndicatorLight{parent=rcs_annunc,label="Turbine Over Speed",colors=cpair(colors.red,colors.gray)}
-    t_ps[1].subscribe("TurbineOverSpeed", t1_tos.update)
+    t1_tos.register(t_ps[1], "TurbineOverSpeed", t1_tos.update)
+
+    TextBox{parent=rcs_tags,text="T1",width=2,height=1,fg_bg=bw_fg_bg}
+    local t1_gtrp = IndicatorLight{parent=rcs_annunc,label="Generator Trip",colors=cpair(colors.yellow,colors.gray),flash=true,period=period.BLINK_250_MS}
+    t1_gtrp.register(t_ps[1], "GeneratorTrip", t1_gtrp.update)
 
     TextBox{parent=rcs_tags,text="T1",width=2,height=1,fg_bg=bw_fg_bg}
     local t1_trp = IndicatorLight{parent=rcs_annunc,label="Turbine Trip",colors=cpair(colors.red,colors.gray),flash=true,period=period.BLINK_250_MS}
-    t_ps[1].subscribe("TurbineTrip", t1_trp.update)
+    t1_trp.register(t_ps[1], "TurbineTrip", t1_trp.update)
 
     if unit.num_turbines > 1 then
+        if (available_space > 2 and unit.num_turbines == 2) or available_space > 3 then
+            _add_space()
+        end
+
         TextBox{parent=rcs_tags,text="T2",width=2,height=1,fg_bg=bw_fg_bg}
         local t2_sdo = TriIndicatorLight{parent=rcs_annunc,label="Steam Relief Valve Open",c1=colors.gray,c2=colors.yellow,c3=colors.red}
-        t_ps[2].subscribe("SteamDumpOpen", t2_sdo.update)
+        t2_sdo.register(t_ps[2], "SteamDumpOpen", t2_sdo.update)
 
         TextBox{parent=rcs_tags,text="T2",width=2,height=1,fg_bg=bw_fg_bg}
         local t2_tos = IndicatorLight{parent=rcs_annunc,label="Turbine Over Speed",colors=cpair(colors.red,colors.gray)}
-        t_ps[2].subscribe("TurbineOverSpeed", t2_tos.update)
+        t2_tos.register(t_ps[2], "TurbineOverSpeed", t2_tos.update)
+
+        TextBox{parent=rcs_tags,text="T2",width=2,height=1,fg_bg=bw_fg_bg}
+        local t2_gtrp = IndicatorLight{parent=rcs_annunc,label="Generator Trip",colors=cpair(colors.yellow,colors.gray),flash=true,period=period.BLINK_250_MS}
+        t2_gtrp.register(t_ps[2], "GeneratorTrip", t2_gtrp.update)
 
         TextBox{parent=rcs_tags,text="T2",width=2,height=1,fg_bg=bw_fg_bg}
         local t2_trp = IndicatorLight{parent=rcs_annunc,label="Turbine Trip",colors=cpair(colors.red,colors.gray),flash=true,period=period.BLINK_250_MS}
-        t_ps[2].subscribe("TurbineTrip", t2_trp.update)
+        t2_trp.register(t_ps[2], "TurbineTrip", t2_trp.update)
     end
 
     if unit.num_turbines > 2 then
+        if available_space > 3 then _add_space() end
+
         TextBox{parent=rcs_tags,text="T3",width=2,height=1,fg_bg=bw_fg_bg}
         local t3_sdo = TriIndicatorLight{parent=rcs_annunc,label="Steam Relief Valve Open",c1=colors.gray,c2=colors.yellow,c3=colors.red}
-        t_ps[3].subscribe("SteamDumpOpen", t3_sdo.update)
+        t3_sdo.register(t_ps[3], "SteamDumpOpen", t3_sdo.update)
 
         TextBox{parent=rcs_tags,text="T3",width=2,height=1,fg_bg=bw_fg_bg}
         local t3_tos = IndicatorLight{parent=rcs_annunc,label="Turbine Over Speed",colors=cpair(colors.red,colors.gray)}
-        t_ps[3].subscribe("TurbineOverSpeed", t3_tos.update)
+        t3_tos.register(t_ps[3], "TurbineOverSpeed", t3_tos.update)
+
+        TextBox{parent=rcs_tags,text="T3",width=2,height=1,fg_bg=bw_fg_bg}
+        local t3_gtrp = IndicatorLight{parent=rcs_annunc,label="Generator Trip",colors=cpair(colors.yellow,colors.gray),flash=true,period=period.BLINK_250_MS}
+        t3_gtrp.register(t_ps[3], "GeneratorTrip", t3_gtrp.update)
 
         TextBox{parent=rcs_tags,text="T3",width=2,height=1,fg_bg=bw_fg_bg}
         local t3_trp = IndicatorLight{parent=rcs_annunc,label="Turbine Trip",colors=cpair(colors.red,colors.gray),flash=true,period=period.BLINK_250_MS}
-        t_ps[3].subscribe("TurbineTrip", t3_trp.update)
+        t3_trp.register(t_ps[3], "TurbineTrip", t3_trp.update)
     end
 
     ----------------------
@@ -339,8 +365,8 @@ local function init(parent, id)
     local set_burn = function () unit.set_burn(burn_rate.get_value()) end
     local set_burn_btn = PushButton{parent=burn_control,x=14,y=2,text="SET",min_width=5,fg_bg=cpair(colors.black,colors.yellow),active_fg_bg=cpair(colors.white,colors.gray),dis_fg_bg=dis_colors,callback=set_burn}
 
-    u_ps.subscribe("burn_rate", burn_rate.set_value)
+    burn_rate.register(u_ps, "burn_rate", burn_rate.set_value)
-    u_ps.subscribe("max_burn", burn_rate.set_max)
+    burn_rate.register(u_ps, "max_burn", burn_rate.set_max)
 
     local start = HazardButton{parent=main,x=2,y=28,text="START",accent=colors.lightBlue,dis_colors=dis_colors,callback=unit.start,fg_bg=hzd_fg_bg}
     local ack_a = HazardButton{parent=main,x=12,y=32,text="ACK \x13",accent=colors.orange,dis_colors=dis_colors,callback=unit.ack_alarms,fg_bg=hzd_fg_bg}
@@ -361,9 +387,12 @@ local function init(parent, id)
         end
     end
 
-    u_ps.subscribe("status", start_button_en_check)
+    start.register(u_ps, "status", start_button_en_check)
-    u_ps.subscribe("rps_tripped", start_button_en_check)
+    start.register(u_ps, "rps_tripped", start_button_en_check)
-    u_ps.subscribe("rps_tripped", function (active) if active then reset.enable() else reset.disable() end end)
+    start.register(u_ps, "auto_group_id", start_button_en_check)
+    start.register(u_ps, "AutoControl", start_button_en_check)
+
+    reset.register(u_ps, "rps_tripped", function (active) if active then reset.enable() else reset.disable() end end)
 
     TextBox{parent=main,text="WASTE PROCESSING",fg_bg=cpair(colors.black,colors.brown),alignment=TEXT_ALIGN.CENTER,width=33,height=1,x=46,y=48}
     local waste_proc = Rectangle{parent=main,border=border(1,colors.brown,true),thin=true,width=33,height=3,x=46,y=49}
@@ -371,7 +400,7 @@ local function init(parent, id)
 
     local waste_mode = MultiButton{parent=waste_div,x=1,y=1,options=waste_opts,callback=unit.set_waste,min_width=6}
 
-    u_ps.subscribe("U_WasteMode", waste_mode.set_value)
+    waste_mode.register(u_ps, "U_WasteMode", waste_mode.set_value)
 
     ----------------------
     -- alarm management --
@@ -394,20 +423,20 @@ local function init(parent, id)
     local a_clt = AlarmLight{parent=alarm_panel,x=6,label="RCS Transient",c1=colors.gray,c2=colors.yellow,c3=colors.green,flash=true,period=period.BLINK_500_MS}
     local a_tbt = AlarmLight{parent=alarm_panel,x=6,label="Turbine Trip",c1=colors.gray,c2=colors.red,c3=colors.green,flash=true,period=period.BLINK_250_MS}
 
-    u_ps.subscribe("Alarm_1", a_brc.update)
+    a_brc.register(u_ps, "Alarm_1", a_brc.update)
-    u_ps.subscribe("Alarm_2", a_rad.update)
+    a_rad.register(u_ps, "Alarm_2", a_rad.update)
-    u_ps.subscribe("Alarm_4", a_dmg.update)
+    a_dmg.register(u_ps, "Alarm_4", a_dmg.update)
 
-    u_ps.subscribe("Alarm_3", a_rcl.update)
+    a_rcl.register(u_ps, "Alarm_3", a_rcl.update)
-    u_ps.subscribe("Alarm_5", a_rcd.update)
+    a_rcd.register(u_ps, "Alarm_5", a_rcd.update)
-    u_ps.subscribe("Alarm_6", a_rot.update)
+    a_rot.register(u_ps, "Alarm_6", a_rot.update)
-    u_ps.subscribe("Alarm_7", a_rht.update)
+    a_rht.register(u_ps, "Alarm_7", a_rht.update)
-    u_ps.subscribe("Alarm_8", a_rwl.update)
+    a_rwl.register(u_ps, "Alarm_8", a_rwl.update)
-    u_ps.subscribe("Alarm_9", a_rwh.update)
+    a_rwh.register(u_ps, "Alarm_9", a_rwh.update)
 
-    u_ps.subscribe("Alarm_10", a_rps.update)
+    a_rps.register(u_ps, "Alarm_10", a_rps.update)
-    u_ps.subscribe("Alarm_11", a_clt.update)
+    a_clt.register(u_ps, "Alarm_11", a_clt.update)
-    u_ps.subscribe("Alarm_12", a_tbt.update)
+    a_tbt.register(u_ps, "Alarm_12", a_tbt.update)
 
     -- ack's and resets
 
@@ -461,7 +490,7 @@ local function init(parent, id)
 
     local group = RadioButton{parent=auto_div,options=ctl_opts,callback=function()end,radio_colors=cpair(colors.blue,colors.white),radio_bg=colors.gray}
 
-    u_ps.subscribe("auto_group_id", function (gid) group.set_value(gid + 1) end)
+    group.register(u_ps, "auto_group_id", function (gid) group.set_value(gid + 1) end)
 
     auto_div.line_break()
 
@@ -473,44 +502,35 @@ local function init(parent, id)
     TextBox{parent=auto_div,text="Prio. Group",height=1,width=11,fg_bg=style.label}
     local auto_grp = TextBox{parent=auto_div,text="Manual",height=1,width=11,fg_bg=bw_fg_bg}
 
-    u_ps.subscribe("auto_group", auto_grp.set_value)
+    auto_grp.register(u_ps, "auto_group", auto_grp.set_value)
 
     auto_div.line_break()
 
     local a_rdy = IndicatorLight{parent=auto_div,label="Ready",x=2,colors=cpair(colors.green,colors.gray)}
     local a_stb = IndicatorLight{parent=auto_div,label="Standby",x=2,colors=cpair(colors.white,colors.gray),flash=true,period=period.BLINK_1000_MS}
 
-    u_ps.subscribe("U_AutoReady", a_rdy.update)
+    a_rdy.register(u_ps, "U_AutoReady", a_rdy.update)
 
     -- update standby indicator
-    u_ps.subscribe("status", function (active)
+    a_stb.register(u_ps, "status", function (active)
         a_stb.update(unit.annunciator.AutoControl and (not active))
     end)
-
+    a_stb.register(u_ps, "AutoControl", function (auto_active)
-    -- enable and disable controls based on group assignment
-    u_ps.subscribe("auto_group_id", function (gid)
-        start_button_en_check()
-
-        if gid == 0 then
-            burn_rate.enable()
-            set_burn_btn.enable()
-        else
-            burn_rate.disable()
-            set_burn_btn.disable()
-        end
-    end)
-
-    -- enable and disable controls based on auto control state (start button is handled separately)
-    u_ps.subscribe("AutoControl", function (auto_active)
-        start_button_en_check()
-
         if auto_active then
             a_stb.update(unit.reactor_data.mek_status.status == false)
         else a_stb.update(false) end
     end)
 
+    -- enable/disable controls based on group assignment (start button is separate)
+    burn_rate.register(u_ps, "auto_group_id", function (gid)
+        if gid == 0 then burn_rate.enable() else burn_rate.disable() end
+    end)
+    set_burn_btn.register(u_ps, "auto_group_id", function (gid)
+        if gid == 0 then set_burn_btn.enable() else set_burn_btn.disable() end
+    end)
+
     -- can't change group if auto is engaged regardless of if this unit is part of auto control
-    f_ps.subscribe("auto_active", function (auto_active)
+    set_grp_btn.register(f_ps, "auto_active", function (auto_active)
         if auto_active then set_grp_btn.disable() else set_grp_btn.enable() end
     end)
 

coordinator/ui/components/unit_overview.lua

@@ -14,9 +14,9 @@ local Div          = require("graphics.elements.div")
 local PipeNetwork  = require("graphics.elements.pipenet")
 local TextBox      = require("graphics.elements.textbox")
 
-local TEXT_ALIGN = core.graphics.TEXT_ALIGN
+local TEXT_ALIGN = core.TEXT_ALIGN
 
-local pipe = core.graphics.pipe
+local pipe = core.pipe
 
 -- make a new unit overview window
 ---@param parent graphics_element parent
@@ -24,19 +24,18 @@ local pipe = core.graphics.pipe
 ---@param y integer top left y
 ---@param unit ioctl_unit unit database entry
 local function make(parent, x, y, unit)
-    local height = 0
     local num_boilers = #unit.boiler_data_tbl
     local num_turbines = #unit.turbine_data_tbl
 
     assert(num_boilers  >= 0 and num_boilers  <= 2, "minimum 0 boilers, maximum 2 boilers")
     assert(num_turbines >= 1 and num_turbines <= 3, "minimum 1 turbine, maximum 3 turbines")
 
+    local height = 25
+
     if num_boilers == 0 and num_turbines == 1 then
         height = 9
     elseif num_boilers == 1 and num_turbines <= 2 then
         height = 17
-    else
-        height = 25
     end
 
     assert(parent.height() >= (y + height), "main display not of sufficient vertical resolution (add an additional row of monitors)")
@@ -51,7 +50,7 @@ local function make(parent, x, y, unit)
     -- REACTOR --
     -------------
 
-    reactor_view(root, 1, 3, unit.reactor_data, unit.unit_ps)
+    reactor_view(root, 1, 3, unit.unit_ps)
 
     if num_boilers > 0 then
         local coolant_pipes = {}

coordinator/ui/components/unit_waiting.lua

@@ -1,33 +0,0 @@
---
--- Reactor Unit Waiting Spinner
---
-
-local style       = require("coordinator.ui.style")
-
-local core        = require("graphics.core")
-
-local Div         = require("graphics.elements.div")
-local TextBox     = require("graphics.elements.textbox")
-
-local WaitingAnim = require("graphics.elements.animations.waiting")
-
-local TEXT_ALIGN = core.graphics.TEXT_ALIGN
-
-local cpair = core.graphics.cpair
-
--- create a unit waiting view
----@param parent graphics_element parent
----@param y integer y offset
-local function init(parent, y)
-    -- bounding box div
-    local root = Div{parent=parent,x=1,y=y,height=5}
-
-    local waiting_x = math.floor(parent.width() / 2) - 2
-
-    TextBox{parent=root,text="Waiting for status...",alignment=TEXT_ALIGN.CENTER,y=1,height=1,fg_bg=cpair(colors.black,style.root.bkg)}
-    WaitingAnim{parent=root,x=waiting_x,y=3,fg_bg=cpair(colors.blue,style.root.bkg)}
-
-    return root
-end
-
-return init

coordinator/ui/layout/main_view.lua

@@ -5,7 +5,6 @@
 local util          = require("scada-common.util")
 
 local iocontrol     = require("coordinator.iocontrol")
-local sounder       = require("coordinator.sounder")
 
 local style         = require("coordinator.ui.style")
 
@@ -15,36 +14,28 @@ local unit_overview = require("coordinator.ui.components.unit_overview")
 
 local core          = require("graphics.core")
 
-local ColorMap      = require("graphics.elements.colormap")
-local DisplayBox    = require("graphics.elements.displaybox")
-local Div           = require("graphics.elements.div")
 local TextBox       = require("graphics.elements.textbox")
 
-local PushButton    = require("graphics.elements.controls.push_button")
-local SwitchButton  = require("graphics.elements.controls.switch_button")
-
 local DataIndicator = require("graphics.elements.indicators.data")
 
-local TEXT_ALIGN = core.graphics.TEXT_ALIGN
+local TEXT_ALIGN = core.TEXT_ALIGN
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
 
 -- create new main view
----@param monitor table main viewscreen
+---@param main graphics_element main displaybox
-local function init(monitor)
+local function init(main)
     local facility = iocontrol.get_db().facility
     local units = iocontrol.get_db().units
 
-    local main = DisplayBox{window=monitor,fg_bg=style.root}
-
     -- window header message
     local header = TextBox{parent=main,y=1,text="Nuclear Generation Facility SCADA Coordinator",alignment=TEXT_ALIGN.CENTER,height=1,fg_bg=style.header}
     local ping = DataIndicator{parent=main,x=1,y=1,label="SVTT",format="%d",value=0,unit="ms",lu_colors=cpair(colors.lightGray, colors.white),width=12,fg_bg=style.header}
     -- max length example: "01:23:45 AM - Wednesday, September 28 2022"
     local datetime = TextBox{parent=main,x=(header.width()-42),y=1,text="",alignment=TEXT_ALIGN.RIGHT,width=42,height=1,fg_bg=style.header}
 
-    facility.ps.subscribe("sv_ping", ping.update)
+    ping.register(facility.ps, "sv_ping", ping.update)
-    facility.ps.subscribe("date_time", datetime.set_value)
+    datetime.register(facility.ps, "date_time", datetime.set_value)
 
     local uo_1, uo_2, uo_3, uo_4    ---@type graphics_element
 
@@ -93,8 +84,6 @@ local function init(monitor)
     process_ctl(main, 2, cnc_bottom_align_start)
 
     imatrix(main, 131, cnc_bottom_align_start, facility.induction_data_tbl[1], facility.induction_ps_tbl[1])
-
-    return main
 end
 
 return init

coordinator/ui/layout/unit_view.lua

@@ -2,21 +2,13 @@
 -- Reactor Unit SCADA Coordinator GUI
 --
 
-local style       = require("coordinator.ui.style")
-
 local unit_detail = require("coordinator.ui.components.unit_detail")
 
-local DisplayBox  = require("graphics.elements.displaybox")
-
 -- create a unit view
----@param monitor table
+---@param main graphics_element main displaybox
 ---@param id integer
-local function init(monitor, id)
+local function init(main, id)
-    local main = DisplayBox{window=monitor,fg_bg=style.root}
-
     unit_detail(main, id)
-
-    return main
 end
 
 return init

coordinator/ui/style.lua

@@ -6,7 +6,7 @@ local core = require("graphics.core")
 
 local style = {}
 
-local cpair = core.graphics.cpair
+local cpair = core.cpair
 
 -- GLOBAL --
 

graphics/core.lua

@@ -1,40 +1,19 @@
 --
--- Graphics Core Functions and Objects
+-- Graphics Core Types, Checks, and Constructors
 --
 
+local events  = require("graphics.events")
+local flasher = require("graphics.flasher")
+
 local core = {}
 
-local flasher = require("graphics.flasher")
-
 core.flasher = flasher
-
-local events = {}
-
----@class monitor_touch
----@field monitor string
----@field x integer
----@field y integer
-
--- create a new touch event definition
----@nodiscard
----@param monitor string
----@param x integer
----@param y integer
----@return monitor_touch
-function events.touch(monitor, x, y)
-    return {
-        monitor = monitor,
-        x = x,
-        y = y
-    }
-end
-
 core.events = events
 
-local graphics = {}
+-- Core Types
 
 ---@enum TEXT_ALIGN
-graphics.TEXT_ALIGN = {
+core.TEXT_ALIGN = {
     LEFT = 1,
     CENTER = 2,
     RIGHT = 3
@@ -53,7 +32,7 @@ graphics.TEXT_ALIGN = {
 ---@param color color border color
 ---@param even? boolean whether to pad width extra to account for rectangular pixels, defaults to false
 ---@return graphics_border
-function graphics.border(width, color, even)
+function core.border(width, color, even)
     return {
         width = width,
         color = color,
@@ -74,7 +53,7 @@ end
 ---@param w integer
 ---@param h integer
 ---@return graphics_frame
-function graphics.gframe(x, y, w, h)
+function core.gframe(x, y, w, h)
     return {
         x = x,
         y = y,
@@ -98,7 +77,7 @@ end
 ---@param a color
 ---@param b color
 ---@return cpair
-function graphics.cpair(a, b)
+function core.cpair(a, b)
     return {
         -- color pairs
         color_a = a,
@@ -135,7 +114,7 @@ end
 ---@param thin? boolean true for 1 subpixel, false (default) for 2
 ---@param align_tr? boolean false to align bottom left (default), true to align top right
 ---@return pipe
-function graphics.pipe(x1, y1, x2, y2, color, thin, align_tr)
+function core.pipe(x1, y1, x2, y2, color, thin, align_tr)
     return {
         x1 = x1,
         y1 = y1,
@@ -149,6 +128,4 @@ function graphics.pipe(x1, y1, x2, y2, color, thin, align_tr)
     }
 end
 
-core.graphics = graphics
-
 return core

graphics/element.lua

@@ -25,13 +25,18 @@ local element = {}
 ---|multi_button_args
 ---|push_button_args
 ---|radio_button_args
+---|sidebar_args
 ---|spinbox_args
 ---|switch_button_args
+---|tabbar_args
 ---|alarm_indicator_light
 ---|core_map_args
 ---|data_indicator_args
 ---|hbar_args
 ---|icon_indicator_args
+---|indicator_led_args
+---|indicator_led_pair_args
+---|indicator_led_rgb_args
 ---|indicator_light_args
 ---|power_indicator_args
 ---|rad_indicator_args
@@ -41,11 +46,17 @@ local element = {}
 ---|colormap_args
 ---|displaybox_args
 ---|div_args
+---|multipane_args
 ---|pipenet_args
 ---|rectangle_args
 ---|textbox_args
 ---|tiling_args
 
+---@class element_subscription
+---@field ps psil ps used
+---@field key string data key
+---@field func function callback
+
 -- a base graphics element, should not be created on its own
 ---@nodiscard
 ---@param args graphics_args arguments
@@ -54,12 +65,13 @@ function element.new(args)
         id = -1,
         elem_type = debug.getinfo(2).name,
         define_completed = false,
-        p_window = nil, ---@type table
+        p_window = nil,                                 ---@type table
-        position = { x = 1, y = 1 },
+        position = { x = 1, y = 1 },                    ---@type coordinate_2d
         child_offset = { x = 0, y = 0 },
-        bounds = { x1 = 1, y1 = 1, x2 = 1, y2 = 1},
+        bounds = { x1 = 1, y1 = 1, x2 = 1, y2 = 1 },    ---@class element_bounds
         next_y = 1,
         children = {},
+        subscriptions = {},
         mt = {}
     }
 
@@ -68,10 +80,12 @@ function element.new(args)
         enabled = true,
         value = nil,    ---@type any
         window = nil,   ---@type table
-        fg_bg = core.graphics.cpair(colors.white, colors.black),
+        fg_bg = core.cpair(colors.white, colors.black),
-        frame = core.graphics.gframe(1, 1, 1, 1)
+        frame = core.gframe(1, 1, 1, 1)
     }
 
+    local name_brief = "graphics.element{" .. self.elem_type .. "}: "
+
     -- element as string
     function self.mt.__tostring()
         return "graphics.element{" .. self.elem_type .. "} @ " .. tostring(self)
@@ -100,7 +114,13 @@ function element.new(args)
         else
             local w, h = self.p_window.getSize()
             protected.frame.x = args.x or 1
-            protected.frame.y = args.y or next_y
+
+            if args.parent ~= nil then
+                protected.frame.y = args.y or (next_y - offset_y)
+            else
+                protected.frame.y = args.y or next_y
+            end
+
             protected.frame.w = args.width or w
             protected.frame.h = args.height or h
         end
@@ -127,10 +147,10 @@ function element.new(args)
         end
 
         -- check frame
-        assert(f.x >= 1, "graphics.element{" .. self.elem_type .. "}: frame x not >= 1")
+        assert(f.x >= 1, name_brief .. "frame x not >= 1")
-        assert(f.y >= 1, "graphics.element{" .. self.elem_type .. "}: frame y not >= 1")
+        assert(f.y >= 1, name_brief .. "frame y not >= 1")
-        assert(f.w >= 1, "graphics.element{" .. self.elem_type .. "}: frame width not >= 1")
+        assert(f.w >= 1, name_brief .. "frame width not >= 1")
-        assert(f.h >= 1, "graphics.element{" .. self.elem_type .. "}: frame height not >= 1")
+        assert(f.h >= 1, name_brief .. "frame height not >= 1")
 
         -- create window
         protected.window = window.create(self.p_window, f.x, f.y, f.w, f.h, true)
@@ -157,9 +177,32 @@ function element.new(args)
         self.bounds.y2 = self.position.y + f.h - 1
     end
 
-    -- handle a touch event
+    -- check if a coordinate is within the bounds of this element
-    ---@param event table monitor_touch event
+    ---@param x integer
-    function protected.handle_touch(event)
+    ---@param y integer
+    function protected.in_bounds(x, y)
+        local in_x = x >= self.bounds.x1 and x <= self.bounds.x2
+        local in_y = y >= self.bounds.y1 and y <= self.bounds.y2
+        return in_x and in_y
+    end
+
+-- luacheck: push ignore
+---@diagnostic disable: unused-local, unused-vararg
+
+    -- dynamically insert a child element
+    ---@param id string|integer element identifier
+    ---@param elem graphics_element element
+    function protected.insert(id, elem)
+    end
+
+    -- dynamically remove a child element
+    ---@param id string|integer element identifier
+    function protected.remove(id)
+    end
+
+    -- handle a mouse event
+    ---@param event mouse_interaction mouse interaction event
+    function protected.handle_mouse(event)
     end
 
     -- handle data value changes
@@ -211,6 +254,9 @@ function element.new(args)
     function protected.resize(...)
     end
 
+-- luacheck: pop
+---@diagnostic enable: unused-local, unused-vararg
+
     -- start animations
     function protected.start_anim()
     end
@@ -235,7 +281,7 @@ function element.new(args)
     end
 
     -- check window
-    assert(self.p_window, "graphics.element{" .. self.elem_type .. "}: no parent window provided")
+    assert(self.p_window, name_brief .. "no parent window provided")
 
     -- prepare the template
     if args.parent == nil then
@@ -252,7 +298,25 @@ function element.new(args)
     ---@nodiscard
     function public.window() return protected.window end
 
-    -- CHILD ELEMENTS --
+    -- delete this element (hide and unsubscribe from PSIL)
+    function public.delete()
+        -- hide + stop animations
+        public.hide()
+
+        -- unsubscribe from PSIL
+        for i = 1, #self.subscriptions do
+            local s = self.subscriptions[i] ---@type element_subscription
+            s.ps.unsubscribe(s.key, s.func)
+        end
+
+        -- delete all children
+        for k, v in pairs(self.children) do
+            v.delete()
+            self.children[k] = nil
+        end
+    end
+
+    -- ELEMENT TREE --
 
     -- add a child element
     ---@nodiscard
@@ -260,6 +324,11 @@ function element.new(args)
     ---@param child graphics_template
     ---@return integer|string key
     function public.__add_child(key, child)
+        -- offset first automatic placement
+        if self.next_y <= self.child_offset.y then
+            self.next_y = self.child_offset.y + 1
+        end
+
         child.prepare_template(self.child_offset.x, self.child_offset.y, self.next_y)
 
         self.next_y = child.frame.y + child.frame.h
@@ -277,12 +346,18 @@ function element.new(args)
 
     -- get a child element
     ---@nodiscard
+    ---@param id element_id
     ---@return graphics_element
-    function public.get_child(key) return self.children[key] end
+    function public.get_child(id) return self.children[id] end
 
-    -- remove child
+    -- remove a child element
-    ---@param key string|integer
+    ---@param id element_id
-    function public.remove(key) self.children[key] = nil end
+    function public.remove(id)
+        if self.children[id] ~= nil then
+            self.children[id].delete()
+            self.children[id] = nil
+        end
+    end
 
     -- attempt to get a child element by ID (does not include this element itself)
     ---@nodiscard
@@ -301,6 +376,25 @@ function element.new(args)
         return nil
     end
 
+    -- DYNAMIC CHILD ELEMENTS --
+
+    -- insert an element as a contained child<br>
+    -- this is intended to be used dynamically, and depends on the target element type.<br>
+    -- not all elements support dynamic children.
+    ---@param id string|integer element identifier
+    ---@param elem graphics_element element
+    function public.insert_element(id, elem)
+        protected.insert(id, elem)
+    end
+
+    -- remove an element from contained children<br>
+    -- this is intended to be used dynamically, and depends on the target element type.<br>
+    -- not all elements support dynamic children.
+    ---@param id string|integer element identifier
+    function public.remove_element(id)
+        protected.remove(id)
+    end
+
     -- AUTO-PLACEMENT --
 
     -- skip a line for automatically placed elements
@@ -394,22 +488,29 @@ function element.new(args)
         protected.resize(...)
     end
 
+    -- reposition the element window<br>
+    -- offsets relative to parent frame are where (1, 1) would be on top of the parent's top left corner
+    ---@param x integer x position relative to parent frame
+    ---@param y integer y position relative to parent frame
+    function public.reposition(x, y)
+        protected.window.reposition(x, y)
+    end
+
     -- FUNCTION CALLBACKS --
 
-    -- handle a monitor touch
+    -- handle a monitor touch or mouse click
-    ---@param event monitor_touch monitor touch event
+    ---@param event mouse_interaction mouse interaction event
-    function public.handle_touch(event)
+    function public.handle_mouse(event)
-        local in_x = event.x >= self.bounds.x1 and event.x <= self.bounds.x2
+        local x_ini, y_ini = event.initial.x, event.initial.y
-        local in_y = event.y >= self.bounds.y1 and event.y <= self.bounds.y2
 
-        if in_x and in_y then
+        local ini_in = protected.in_bounds(x_ini, y_ini)
-            local event_T = core.events.touch(event.monitor, (event.x - self.position.x) + 1, (event.y - self.position.y) + 1)
 
-            -- handle the touch event, transformed into the window frame
+        if ini_in then
-            protected.handle_touch(event_T)
+            local event_T = core.events.mouse_transposed(event, self.position.x, self.position.y)
 
-            -- pass on touch event to children
+            -- handle the mouse event then pass to children
-            for _, val in pairs(self.children) do val.handle_touch(event_T) end
+            protected.handle_mouse(event_T)
+            for _, child in pairs(self.children) do child.handle_mouse(event_T) end
         end
     end
 
@@ -425,25 +526,29 @@ function element.new(args)
         protected.response_callback(result)
     end
 
+    -- register a callback with a PSIL, allowing for automatic unregister on delete<br>
+    -- do not use graphics elements directly with PSIL subscribe()
+    ---@param ps psil PSIL to subscribe to
+    ---@param key string key to subscribe to
+    ---@param func function function to link
+    function public.register(ps, key, func)
+        table.insert(self.subscriptions, { ps = ps, key = key, func = func })
+        ps.subscribe(key, func)
+    end
+
     -- VISIBILITY --
 
     -- show the element
     function public.show()
         protected.window.setVisible(true)
         protected.start_anim()
-
+        for _, child in pairs(self.children) do child.show() end
-        for i = 1, #self.children do
-            self.children[i].show()
-        end
     end
 
     -- hide the element
     function public.hide()
         protected.stop_anim()
-        for i = 1, #self.children do
+        for _, child in pairs(self.children) do child.hide() end
-            self.children[i].hide()
-        end
-
         protected.window.setVisible(false)
     end
 

graphics/elements/animations/waiting.lua

@@ -85,7 +85,7 @@ local function waiting(args)
         if state >= 12 then state = 0 end
 
         if run_animation then
-            tcd.dispatch_unique(0.5, animate)
+            tcd.dispatch_unique(0.15, animate)
         end
     end
 

graphics/elements/controls/hazard_button.lua

@@ -140,26 +140,27 @@ local function hazard_button(args)
         end
     end
 
-    -- handle touch
+    -- handle mouse interaction
-    ---@param event monitor_touch monitor touch event
+    ---@param event mouse_interaction mouse event
----@diagnostic disable-next-line: unused-local
+    function e.handle_mouse(event)
-    function e.handle_touch(event)
         if e.enabled then
-            -- change text color to indicate clicked
+            if core.events.was_clicked(event.type) then
-            e.window.setTextColor(args.accent)
+                -- change text color to indicate clicked
-            e.window.setCursorPos(3, 2)
+                e.window.setTextColor(args.accent)
-            e.window.write(args.text)
+                e.window.setCursorPos(3, 2)
+                e.window.write(args.text)
 
-            -- abort any other callbacks
+                -- abort any other callbacks
-            tcd.abort(on_timeout)
+                tcd.abort(on_timeout)
-            tcd.abort(on_success)
+                tcd.abort(on_success)
-            tcd.abort(on_failure)
+                tcd.abort(on_failure)
 
-            -- 1.5 second timeout
+                -- 1.5 second timeout
-            tcd.dispatch(1.5, on_timeout)
+                tcd.dispatch(1.5, on_timeout)
 
-            -- call the touch callback
+                -- call the touch callback
-            args.callback()
+                args.callback()
+            end
         end
     end
 
@@ -167,18 +168,13 @@ local function hazard_button(args)
     ---@param result boolean true for success, false for failure
     function e.response_callback(result)
         tcd.abort(on_timeout)
-
+        if result then on_success() else on_failure(0) end
-        if result then
-            on_success()
-        else
-            on_failure(0)
-        end
     end
 
     -- set the value (true simulates pressing the button)
     ---@param val boolean new value
     function e.set_value(val)
-        if val then e.handle_touch(core.events.touch("", 1, 1)) end
+        if val then e.handle_mouse(core.events.mouse_generic(core.events.CLICK_TYPE.UP, 1, 1)) end
     end
 
     -- show the button as disabled

graphics/elements/controls/multi_button.lua

@@ -2,13 +2,13 @@
 
 local util    = require("scada-common.util")
 
+local core    = require("graphics.core")
 local element = require("graphics.element")
 
 ---@class button_option
 ---@field text string
 ---@field fg_bg cpair
 ---@field active_fg_bg cpair
----@field _lpad integer automatically calculated left pad
 ---@field _start_x integer starting touch x range (inclusive)
 ---@field _end_x integer ending touch x range (inclusive)
 
@@ -62,9 +62,7 @@ local function multi_button(args)
     local next_x = 2
     for i = 1, #args.options do
         local opt = args.options[i] ---@type button_option
-        local w = string.len(opt.text)
 
-        opt._lpad = math.floor((e.frame.w - w) / 2)
         opt._start_x = next_x
         opt._end_x = next_x + button_width - 1
 
@@ -92,19 +90,32 @@ local function multi_button(args)
         end
     end
 
-    -- handle touch
+    -- check which button a given x is within
-    ---@param event monitor_touch monitor touch event
+    ---@return integer|nil button index or nil if not within a button
-    function e.handle_touch(event)
+    local function which_button(x)
-        -- determine what was pressed
+        for i = 1, #args.options do
-        if e.enabled and event.y == 1 then
+            local opt = args.options[i] ---@type button_option
-            for i = 1, #args.options do
+            if x >= opt._start_x and x <= opt._end_x then return i end
-                local opt = args.options[i] ---@type button_option
+        end
 
-                if event.x >= opt._start_x and event.x <= opt._end_x then
+        return nil
-                    e.value = i
+    end
-                    draw()
+
-                    args.callback(e.value)
+    -- handle mouse interaction
-                end
+    ---@param event mouse_interaction mouse event
+    function e.handle_mouse(event)
+        -- if enabled and the button row was pressed...
+        if e.enabled and core.events.was_clicked(event.type) then
+            -- a button may have been pressed, which one was it?
+            local button_ini = which_button(event.initial.x)
+            local button_cur = which_button(event.current.x)
+
+            -- mouse up must always have started with a mouse down on the same button to count as a click
+            -- tap always has identical coordinates, so this always passes for taps
+            if button_ini == button_cur and button_cur ~= nil then
+                e.value = button_cur
+                draw()
+                args.callback(e.value)
             end
         end
     end

graphics/elements/controls/push_button.lua

@@ -5,10 +5,12 @@ local tcd     = require("scada-common.tcallbackdsp")
 local core    = require("graphics.core")
 local element = require("graphics.element")
 
+local CLICK_TYPE = core.events.CLICK_TYPE
+
 ---@class push_button_args
 ---@field text string button text
 ---@field callback function function to call on touch
----@field min_width? integer text length + 2 if omitted
+---@field min_width? integer text length if omitted
 ---@field active_fg_bg? cpair foreground/background colors when pressed
 ---@field dis_fg_bg? cpair foreground/background colors when disabled
 ---@field parent graphics_element
@@ -24,6 +26,8 @@ local element = require("graphics.element")
 local function push_button(args)
     assert(type(args.text) == "string", "graphics.elements.controls.push_button: text is a required field")
     assert(type(args.callback) == "function", "graphics.elements.controls.push_button: callback is a required field")
+    assert(type(args.min_width) == "nil" or (type(args.min_width) == "number" and args.min_width > 0),
+        "graphics.elements.controls.push_button: min_width must be nil or a number > 0")
 
     local text_width = string.len(args.text)
 
@@ -47,38 +51,50 @@ local function push_button(args)
         e.window.write(args.text)
     end
 
-    -- handle touch
+    -- draw the button as pressed (if active_fg_bg set)
-    ---@param event monitor_touch monitor touch event
+    local function show_pressed()
----@diagnostic disable-next-line: unused-local
+        if e.enabled and args.active_fg_bg ~= nil then
-    function e.handle_touch(event)
+            e.value = true
+            e.window.setTextColor(args.active_fg_bg.fgd)
+            e.window.setBackgroundColor(args.active_fg_bg.bkg)
+            draw()
+        end
+    end
+
+    -- draw the button as unpressed (if active_fg_bg set)
+    local function show_unpressed()
+        if e.enabled and args.active_fg_bg ~= nil then
+            e.value = false
+            e.window.setTextColor(e.fg_bg.fgd)
+            e.window.setBackgroundColor(e.fg_bg.bkg)
+            draw()
+        end
+    end
+
+    -- handle mouse interaction
+    ---@param event mouse_interaction mouse event
+    function e.handle_mouse(event)
         if e.enabled then
-            if args.active_fg_bg ~= nil then
+            if event.type == CLICK_TYPE.TAP then
-                -- show as pressed
+                show_pressed()
-                e.value = true
-                e.window.setTextColor(args.active_fg_bg.fgd)
-                e.window.setBackgroundColor(args.active_fg_bg.bkg)
-                draw()
-
                 -- show as unpressed in 0.25 seconds
-                tcd.dispatch(0.25, function ()
+                if args.active_fg_bg ~= nil then tcd.dispatch(0.25, show_unpressed) end
-                    e.value = false
+                args.callback()
-                    if e.enabled then
+            elseif event.type == CLICK_TYPE.DOWN then
-                        e.window.setTextColor(e.fg_bg.fgd)
+                show_pressed()
-                        e.window.setBackgroundColor(e.fg_bg.bkg)
+            elseif event.type == CLICK_TYPE.UP then
-                    end
+                show_unpressed()
-                    draw()
+                if e.in_bounds(event.current.x, event.current.y) then
-                end)
+                    args.callback()
+                end
             end
-
-            -- call the touch callback
-            args.callback()
         end
     end
 
     -- set the value (true simulates pressing the button)
     ---@param val boolean new value
     function e.set_value(val)
-        if val then e.handle_touch(core.events.touch("", 1, 1)) end
+        if val then e.handle_mouse(core.events.mouse_generic(core.events.CLICK_TYPE.UP, 1, 1)) end
     end
 
     -- show butten as enabled

graphics/elements/controls/radio_button.lua

@@ -1,5 +1,6 @@
 -- Radio Button Graphics Element
 
+local core    = require("graphics.core")
 local element = require("graphics.element")
 
 ---@class radio_button_args
@@ -79,13 +80,13 @@ local function radio_button(args)
         end
     end
 
-    -- handle touch
+    -- handle mouse interaction
-    ---@param event monitor_touch monitor touch event
+    ---@param event mouse_interaction mouse event
-    function e.handle_touch(event)
+    function e.handle_mouse(event)
-        -- determine what was pressed
+        if e.enabled and core.events.was_clicked(event.type) and (event.initial.y == event.current.y) then
-        if e.enabled then
+            -- determine what was pressed
-            if args.options[event.y] ~= nil then
+            if args.options[event.current.y] ~= nil then
-                e.value = event.y
+                e.value = event.current.y
                 draw()
                 args.callback(e.value)
             end

graphics/elements/controls/sidebar.lua

@@ -0,0 +1,121 @@
+-- Sidebar Graphics Element
+
+local tcd     = require("scada-common.tcallbackdsp")
+
+local core    = require("graphics.core")
+local element = require("graphics.element")
+
+local CLICK_TYPE = core.events.CLICK_TYPE
+
+---@class sidebar_tab
+---@field char string character identifier
+---@field color cpair tab colors (fg/bg)
+
+---@class sidebar_args
+---@field tabs table sidebar tab options
+---@field callback function function to call on tab change
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field height? integer parent height if omitted
+---@field fg_bg? cpair foreground/background colors
+
+-- new sidebar tab selector
+---@param args sidebar_args
+---@return graphics_element element, element_id id
+local function sidebar(args)
+    assert(type(args.tabs) == "table", "graphics.elements.controls.sidebar: tabs is a required field")
+    assert(#args.tabs > 0, "graphics.elements.controls.sidebar: at least one tab is required")
+    assert(type(args.callback) == "function", "graphics.elements.controls.sidebar: callback is a required field")
+
+    -- always 3 wide
+    args.width = 3
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    assert(e.frame.h >= (#args.tabs * 3), "graphics.elements.controls.sidebar: height insufficent to display all tabs")
+
+    -- default to 1st tab
+    e.value = 1
+
+    -- show the button state
+    ---@param pressed boolean if the currently selected tab should appear as actively pressed
+    ---@param pressed_idx? integer optional index to show as held (that is not yet selected)
+    local function draw(pressed, pressed_idx)
+        pressed_idx = pressed_idx or e.value
+
+        for i = 1, #args.tabs do
+            local tab = args.tabs[i] ---@type sidebar_tab
+
+            local y = ((i - 1) * 3) + 1
+
+            e.window.setCursorPos(1, y)
+
+            if pressed and i == pressed_idx then
+                e.window.setTextColor(e.fg_bg.fgd)
+                e.window.setBackgroundColor(e.fg_bg.bkg)
+            else
+                e.window.setTextColor(tab.color.fgd)
+                e.window.setBackgroundColor(tab.color.bkg)
+            end
+
+            e.window.write("   ")
+            e.window.setCursorPos(1, y + 1)
+            if e.value == i then
+                -- show as selected
+                e.window.write(" " .. tab.char .. "\x10")
+            else
+                -- show as unselected
+                e.window.write(" " .. tab.char .. " ")
+            end
+            e.window.setCursorPos(1, y + 2)
+            e.window.write("   ")
+        end
+    end
+
+    -- handle mouse interaction
+    ---@param event mouse_interaction mouse event
+    function e.handle_mouse(event)
+        -- determine what was pressed
+        if e.enabled then
+            local cur_idx = math.ceil(event.current.y / 3)
+            local ini_idx = math.ceil(event.initial.y / 3)
+
+            if args.tabs[cur_idx] ~= nil then
+                if event.type == CLICK_TYPE.TAP then
+                    e.value = cur_idx
+                    draw(true)
+                    -- show as unpressed in 0.25 seconds
+                    tcd.dispatch(0.25, function () draw(false) end)
+                    args.callback(e.value)
+                elseif event.type == CLICK_TYPE.DOWN then
+                    draw(true, cur_idx)
+                elseif event.type == CLICK_TYPE.UP then
+                    if cur_idx == ini_idx and e.in_bounds(event.current.x, event.current.y) then
+                        e.value = cur_idx
+                        draw(false)
+                        args.callback(e.value)
+                    else draw(false) end
+                end
+            elseif event.type == CLICK_TYPE.UP then
+                draw(false)
+            end
+        end
+    end
+
+    -- set the value
+    ---@param val integer new value
+    function e.set_value(val)
+        e.value = val
+        draw(false)
+    end
+
+    -- initial draw
+    draw(false)
+
+    return e.get()
+end
+
+return sidebar

graphics/elements/controls/spinbox_numeric.lua

@@ -2,6 +2,7 @@
 
 local util    = require("scada-common.util")
 
+local core    = require("graphics.core")
 local element = require("graphics.element")
 
 ---@class spinbox_args
@@ -30,8 +31,7 @@ local function spinbox(args)
     assert(util.is_int(wn_prec), "graphics.element.controls.spinbox_numeric: whole number precision must be an integer")
     assert(util.is_int(fr_prec), "graphics.element.controls.spinbox_numeric: fractional precision must be an integer")
 
-    local fmt = ""
+    local fmt, fmt_init ---@type string, string
-    local fmt_init = ""
 
     if fr_prec > 0 then
         fmt = "%" .. (wn_prec + fr_prec + 1) .. "." .. fr_prec .. "f"
@@ -127,23 +127,26 @@ local function spinbox(args)
     -- init with the default value
     show_num()
 
-    -- handle touch
+    -- handle mouse interaction
-    ---@param event monitor_touch monitor touch event
+    ---@param event mouse_interaction mouse event
-    function e.handle_touch(event)
+    function e.handle_mouse(event)
         -- only handle if on an increment or decrement arrow
-        if e.enabled and event.x ~= dec_point_x then
+        if e.enabled and core.events.was_clicked(event.type) and
-            local idx = util.trinary(event.x > dec_point_x, event.x - 1, event.x)
+                (event.current.x ~= dec_point_x) and (event.current.y ~= 2) then
-            if digits[idx] ~= nil then
+            if event.current.x == event.initial.x and event.current.y == event.initial.y then
-                if event.y == 1 then
+                local idx = util.trinary(event.current.x > dec_point_x, event.current.x - 1, event.current.x)
-                    -- increment
+                if digits[idx] ~= nil then
-                    digits[idx] = digits[idx] + 1
+                    if event.current.y == 1 then
-                elseif event.y == 3 then
+                        -- increment
-                    -- decrement
+                        digits[idx] = digits[idx] + 1
-                    digits[idx] = digits[idx] - 1
+                    elseif event.current.y == 3 then
-                end
+                        -- decrement
+                        digits[idx] = digits[idx] - 1
+                    end
 
-                update_value()
+                    update_value()
-                show_num()
+                    show_num()
+                end
             end
         end
     end

graphics/elements/controls/switch_button.lua

@@ -1,5 +1,6 @@
 -- Button Graphics Element
 
+local core    = require("graphics.core")
 local element = require("graphics.element")
 
 ---@class switch_button_args
@@ -22,13 +23,15 @@ local function switch_button(args)
     assert(type(args.text) == "string", "graphics.elements.controls.switch_button: text is a required field")
     assert(type(args.callback) == "function", "graphics.elements.controls.switch_button: callback is a required field")
     assert(type(args.active_fg_bg) == "table", "graphics.elements.controls.switch_button: active_fg_bg is a required field")
+    assert(type(args.min_width) == "nil" or (type(args.min_width) == "number" and args.min_width > 0),
+        "graphics.elements.controls.switch_button: min_width must be nil or a number > 0")
 
-    -- single line
-    args.height = 1
-
-    -- determine widths
     local text_width = string.len(args.text)
-    args.width = math.max(text_width + 2, args.min_width)
+
+    -- single line height, calculate width
+    args.height = 1
+    args.min_width = args.min_width or 0
+    args.width = math.max(text_width, args.min_width)
 
     -- create new graphics element base object
     local e = element.new(args)
@@ -62,11 +65,10 @@ local function switch_button(args)
     -- initial draw
     draw_state()
 
-    -- handle touch
+    -- handle mouse interaction
-    ---@param event monitor_touch monitor touch event
+    ---@param event mouse_interaction mouse event
----@diagnostic disable-next-line: unused-local
+    function e.handle_mouse(event)
-    function e.handle_touch(event)
+        if e.enabled and core.events.was_clicked(event.type) then
-        if e.enabled then
             -- toggle state
             e.value = not e.value
             draw_state()

graphics/elements/controls/tabbar.lua

@@ -0,0 +1,130 @@
+-- Tab Bar Graphics Element
+
+local util    = require("scada-common.util")
+
+local core    = require("graphics.core")
+local element = require("graphics.element")
+
+---@class tabbar_tab
+---@field name string tab name
+---@field color cpair tab colors (fg/bg)
+---@field _start_x integer starting touch x range (inclusive)
+---@field _end_x integer ending touch x range (inclusive)
+
+---@class tabbar_args
+---@field tabs table tab options
+---@field callback function function to call on tab change
+---@field min_width? integer text length + 2 if omitted
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field width? integer parent width if omitted
+---@field fg_bg? cpair foreground/background colors
+
+-- new tab selector
+---@param args tabbar_args
+---@return graphics_element element, element_id id
+local function tabbar(args)
+    assert(type(args.tabs) == "table", "graphics.elements.controls.tabbar: tabs is a required field")
+    assert(#args.tabs > 0, "graphics.elements.controls.tabbar: at least one tab is required")
+    assert(type(args.callback) == "function", "graphics.elements.controls.tabbar: callback is a required field")
+    assert(type(args.min_width) == "nil" or (type(args.min_width) == "number" and args.min_width > 0),
+        "graphics.elements.controls.tabbar: min_width must be nil or a number > 0")
+
+    -- always 1 tall
+    args.height = 1
+
+    -- determine widths
+    local max_width = 1
+    for i = 1, #args.tabs do
+        local opt = args.tabs[i]    ---@type tabbar_tab
+        if string.len(opt.name) > max_width then
+            max_width = string.len(opt.name)
+        end
+    end
+
+    local button_width = math.max(max_width, args.min_width or 0)
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    assert(e.frame.w >= (button_width * #args.tabs), "graphics.elements.controls.tabbar: width insufficent to display all tabs")
+
+    -- default to 1st tab
+    e.value = 1
+
+    -- calculate required tab dimension information
+    local next_x = 1
+    for i = 1, #args.tabs do
+        local tab = args.tabs[i] ---@type tabbar_tab
+
+        tab._start_x = next_x
+        tab._end_x = next_x + button_width - 1
+
+        next_x = next_x + button_width
+    end
+
+    -- show the tab state
+    local function draw()
+        for i = 1, #args.tabs do
+            local tab = args.tabs[i]    ---@type tabbar_tab
+
+            e.window.setCursorPos(tab._start_x, 1)
+
+            if e.value == i then
+                e.window.setTextColor(tab.color.fgd)
+                e.window.setBackgroundColor(tab.color.bkg)
+            else
+                e.window.setTextColor(e.fg_bg.fgd)
+                e.window.setBackgroundColor(e.fg_bg.bkg)
+            end
+
+            e.window.write(util.pad(tab.name, button_width))
+        end
+    end
+
+    -- check which tab a given x is within
+    ---@return integer|nil button index or nil if not within a tab
+    local function which_tab(x)
+        for i = 1, #args.tabs do
+            local tab = args.tabs[i]    ---@type tabbar_tab
+            if x >= tab._start_x and x <= tab._end_x then return i end
+        end
+
+        return nil
+    end
+
+    -- handle mouse interaction
+    ---@param event mouse_interaction mouse event
+    function e.handle_mouse(event)
+        -- determine what was pressed
+        if e.enabled and core.events.was_clicked(event.type) then
+            -- a button may have been pressed, which one was it?
+            local tab_ini = which_tab(event.initial.x)
+            local tab_cur = which_tab(event.current.x)
+
+            -- mouse up must always have started with a mouse down on the same tab to count as a click
+            -- tap always has identical coordinates, so this always passes for taps
+            if tab_ini == tab_cur and tab_cur ~= nil then
+                e.value = tab_cur
+                draw()
+                args.callback(e.value)
+            end
+        end
+    end
+
+    -- set the value
+    ---@param val integer new value
+    function e.set_value(val)
+        e.value = val
+        draw()
+    end
+
+    -- initial draw
+    draw()
+
+    return e.get()
+end
+
+return tabbar

graphics/elements/indicators/coremap.lua

@@ -26,7 +26,7 @@ local function core_map(args)
     args.height = 18
 
     -- inherit only foreground color
-    args.fg_bg = core.graphics.cpair(args.parent.get_fg_bg().fgd, colors.gray)
+    args.fg_bg = core.cpair(args.parent.get_fg_bg().fgd, colors.gray)
 
     -- create new graphics element base object
     local e = element.new(args)
@@ -73,7 +73,7 @@ local function core_map(args)
     local function draw_core(t)
         local i = 1
         local back_c = "F"
-        local text_c = "8"
+        local text_c    ---@type string
 
         -- determine fuel assembly coloring
         if t <= 300 then

graphics/elements/indicators/led.lua

@@ -0,0 +1,100 @@
+-- Indicator "LED" Graphics Element
+
+local util    = require("scada-common.util")
+
+local element = require("graphics.element")
+local flasher = require("graphics.flasher")
+
+---@class indicator_led_args
+---@field label string indicator label
+---@field colors cpair on/off colors (a/b respectively)
+---@field min_label_width? integer label length if omitted
+---@field flash? boolean whether to flash on true rather than stay on
+---@field period? PERIOD flash period
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field fg_bg? cpair foreground/background colors
+
+-- new indicator LED
+---@nodiscard
+---@param args indicator_led_args
+---@return graphics_element element, element_id id
+local function indicator_led(args)
+    assert(type(args.label) == "string", "graphics.elements.indicators.led: label is a required field")
+    assert(type(args.colors) == "table", "graphics.elements.indicators.led: colors is a required field")
+
+    if args.flash then
+        assert(util.is_int(args.period), "graphics.elements.indicators.led: period is a required field if flash is enabled")
+    end
+
+    -- single line
+    args.height = 1
+
+    -- determine width
+    args.width = math.max(args.min_label_width or 0, string.len(args.label)) + 2
+
+    -- flasher state
+    local flash_on = true
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    -- called by flasher when enabled
+    local function flash_callback()
+        e.window.setCursorPos(1, 1)
+
+        if flash_on then
+            e.window.blit("\x8c", args.colors.blit_a, e.fg_bg.blit_bkg)
+        else
+            e.window.blit("\x8c", args.colors.blit_b, e.fg_bg.blit_bkg)
+        end
+
+        flash_on = not flash_on
+    end
+
+    -- enable light or start flashing
+    local function enable()
+        if args.flash then
+            flash_on = true
+            flasher.start(flash_callback, args.period)
+        else
+            e.window.setCursorPos(1, 1)
+            e.window.blit("\x8c", args.colors.blit_a, e.fg_bg.blit_bkg)
+        end
+    end
+
+    -- disable light or stop flashing
+    local function disable()
+        if args.flash then
+            flash_on = false
+            flasher.stop(flash_callback)
+        end
+
+        e.window.setCursorPos(1, 1)
+        e.window.blit("\x8c", args.colors.blit_b, e.fg_bg.blit_bkg)
+    end
+
+    -- on state change
+    ---@param new_state boolean indicator state
+    function e.on_update(new_state)
+        e.value = new_state
+        if new_state then enable() else disable() end
+    end
+
+    -- set indicator state
+    ---@param val boolean indicator state
+    function e.set_value(val) e.on_update(val) end
+
+    -- write label and initial indicator light
+    e.on_update(false)
+    if string.len(args.label) > 0 then
+        e.window.setCursorPos(3, 1)
+        e.window.write(args.label)
+    end
+
+    return e.get()
+end
+
+return indicator_led

graphics/elements/indicators/ledpair.lua

@@ -0,0 +1,114 @@
+-- Indicator LED Pair Graphics Element (two LEDs provide: off, color_a, color_b)
+
+local util    = require("scada-common.util")
+
+local element = require("graphics.element")
+local flasher = require("graphics.flasher")
+
+---@class indicator_led_pair_args
+---@field label string indicator label
+---@field off color color for off
+---@field c1 color color for #1 on
+---@field c2 color color for #2 on
+---@field min_label_width? integer label length if omitted
+---@field flash? boolean whether to flash when on rather than stay on
+---@field period? PERIOD flash period
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field fg_bg? cpair foreground/background colors
+
+-- new dual LED indicator light
+---@nodiscard
+---@param args indicator_led_pair_args
+---@return graphics_element element, element_id id
+local function indicator_led_pair(args)
+    assert(type(args.label) == "string", "graphics.elements.indicators.ledpair: label is a required field")
+    assert(type(args.off) == "number", "graphics.elements.indicators.ledpair: off is a required field")
+    assert(type(args.c1) == "number", "graphics.elements.indicators.ledpair: c1 is a required field")
+    assert(type(args.c2) == "number", "graphics.elements.indicators.ledpair: c2 is a required field")
+
+    if args.flash then
+        assert(util.is_int(args.period), "graphics.elements.indicators.ledpair: period is a required field if flash is enabled")
+    end
+
+    -- single line
+    args.height = 1
+
+    -- determine width
+    args.width = math.max(args.min_label_width or 0, string.len(args.label)) + 2
+
+    -- flasher state
+    local flash_on = true
+
+    -- blit translations
+    local co = colors.toBlit(args.off)
+    local c1 = colors.toBlit(args.c1)
+    local c2 = colors.toBlit(args.c2)
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    -- init value for initial check in on_update
+    e.value = 1
+
+    -- called by flasher when enabled
+    local function flash_callback()
+        e.window.setCursorPos(1, 1)
+
+        if flash_on then
+            if e.value == 2 then
+                e.window.blit("\x8c", c1, e.fg_bg.blit_bkg)
+            elseif e.value == 3 then
+                e.window.blit("\x8c", c2, e.fg_bg.blit_bkg)
+            end
+        else
+            e.window.blit("\x8c", co, e.fg_bg.blit_bkg)
+        end
+
+        flash_on = not flash_on
+    end
+
+    -- on state change
+    ---@param new_state integer indicator state
+    function e.on_update(new_state)
+        local was_off = e.value <= 1
+
+        e.value = new_state
+        e.window.setCursorPos(1, 1)
+
+        if args.flash then
+            if was_off and (new_state > 1) then
+                flash_on = true
+                flasher.start(flash_callback, args.period)
+            elseif new_state <= 1 then
+                flash_on = false
+                flasher.stop(flash_callback)
+
+                e.window.blit("\x8c", co, e.fg_bg.blit_bkg)
+            end
+        elseif new_state == 2 then
+            e.window.blit("\x8c", c1, e.fg_bg.blit_bkg)
+        elseif new_state == 3 then
+            e.window.blit("\x8c", c2, e.fg_bg.blit_bkg)
+        else
+            e.window.blit("\x8c", co, e.fg_bg.blit_bkg)
+        end
+    end
+
+    -- set indicator state
+    ---@param val integer indicator state
+    function e.set_value(val) e.on_update(val) end
+
+    -- write label and initial indicator light
+    e.on_update(1)
+    if string.len(args.label) > 0 then
+        e.window.setCursorPos(3, 1)
+        e.window.write(args.label)
+    end
+
+    return e.get()
+end
+
+return indicator_led_pair

graphics/elements/indicators/ledrgb.lua

@@ -0,0 +1,59 @@
+-- Indicator RGB LED Graphics Element
+
+local element = require("graphics.element")
+
+---@class indicator_led_rgb_args
+---@field label string indicator label
+---@field colors table colors to use
+---@field min_label_width? integer label length if omitted
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field fg_bg? cpair foreground/background colors
+
+-- new RGB LED indicator light
+---@nodiscard
+---@param args indicator_led_rgb_args
+---@return graphics_element element, element_id id
+local function indicator_led_rgb(args)
+    assert(type(args.label) == "string", "graphics.elements.indicators.ledrgb: label is a required field")
+    assert(type(args.colors) == "table", "graphics.elements.indicators.ledrgb: colors is a required field")
+
+    -- single line
+    args.height = 1
+
+    -- determine width
+    args.width = math.max(args.min_label_width or 0, string.len(args.label)) + 2
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    -- init value for initial check in on_update
+    e.value = 1
+
+    -- on state change
+    ---@param new_state integer indicator state
+    function e.on_update(new_state)
+        e.value = new_state
+        e.window.setCursorPos(1, 1)
+        if type(args.colors[new_state]) == "number" then
+            e.window.blit("\x8c", colors.toBlit(args.colors[new_state]), e.fg_bg.blit_bkg)
+        end
+    end
+
+    -- set indicator state
+    ---@param val integer indicator state
+    function e.set_value(val) e.on_update(val) end
+
+    -- write label and initial indicator light
+    e.on_update(1)
+    if string.len(args.label) > 0 then
+        e.window.setCursorPos(3, 1)
+        e.window.write(args.label)
+    end
+
+    return e.get()
+end
+
+return indicator_led_rgb

graphics/elements/multipane.lua

@@ -0,0 +1,42 @@
+-- Multi-Pane Display Graphics Element
+
+local element = require("graphics.element")
+
+---@class multipane_args
+---@field panes table panes to swap between
+---@field parent graphics_element
+---@field id? string element id
+---@field x? integer 1 if omitted
+---@field y? integer 1 if omitted
+---@field width? integer parent width if omitted
+---@field height? integer parent height if omitted
+---@field gframe? graphics_frame frame instead of x/y/width/height
+---@field fg_bg? cpair foreground/background colors
+
+-- new multipane element
+---@nodiscard
+---@param args multipane_args
+---@return graphics_element element, element_id id
+local function multipane(args)
+    assert(type(args.panes) == "table", "graphics.elements.multipane: panes is a required field")
+
+    -- create new graphics element base object
+    local e = element.new(args)
+
+    -- select which pane is shown
+    ---@param value integer pane to show
+    function e.set_value(value)
+        if (e.value ~= value) and (value > 0) and (value <= #args.panes) then
+            e.value = value
+
+            for i = 1, #args.panes do args.panes[i].hide() end
+            args.panes[value].show()
+        end
+    end
+
+    e.set_value(1)
+
+    return e.get()
+end
+
+return multipane

graphics/elements/pipenet.lua

@@ -37,7 +37,7 @@ local function pipenet(args)
     args.y = args.y or 1
 
     if args.bg ~= nil then
-        args.fg_bg = core.graphics.cpair(args.bg, args.bg)
+        args.fg_bg = core.cpair(args.bg, args.bg)
     end
 
     -- create new graphics element base object
@@ -55,7 +55,7 @@ local function pipenet(args)
 
         e.window.setCursorPos(x, y)
 
-        local c = core.graphics.cpair(pipe.color, e.fg_bg.bkg)
+        local c = core.cpair(pipe.color, e.fg_bg.bkg)
 
         if pipe.align_tr then
             -- cross width then height

graphics/elements/rectangle.lua

@@ -7,6 +7,7 @@ local element = require("graphics.element")
 ---@class rectangle_args
 ---@field border? graphics_border
 ---@field thin? boolean true to use extra thin even borders
+---@field even_inner? boolean true to make the inner area of a border even
 ---@field parent graphics_element
 ---@field id? string element id
 ---@field x? integer 1 if omitted
@@ -66,14 +67,27 @@ local function rectangle(args)
         local blit_bg_top_bot = util.strrep(border_blit, e.frame.w)
 
         -- partial bars
-        local p_a = util.spaces(border_width) .. util.strrep("\x8f", inner_width) .. util.spaces(border_width)
+        local p_a, p_b, p_s
-        local p_b = util.spaces(border_width) .. util.strrep("\x83", inner_width) .. util.spaces(border_width)
-        local p_s = spaces
-
         if args.thin == true then
-            p_a = "\x97" .. util.strrep("\x83", inner_width) .. "\x94"
+            if args.even_inner == true then
-            p_b = "\x8a" .. util.strrep("\x8f", inner_width) .. "\x85"
+                p_a = "\x9c" .. util.strrep("\x8c", inner_width) .. "\x93"
+                p_b = "\x8d" .. util.strrep("\x8c", inner_width) .. "\x8e"
+            else
+                p_a = "\x97" .. util.strrep("\x83", inner_width) .. "\x94"
+                p_b = "\x8a" .. util.strrep("\x8f", inner_width) .. "\x85"
+            end
+
             p_s = "\x95" .. util.spaces(inner_width) .. "\x95"
+        else
+            if args.even_inner == true then
+                p_a = util.strrep("\x83", inner_width + width_x2)
+                p_b = util.strrep("\x8f", inner_width + width_x2)
+            else
+                p_a = util.spaces(border_width) .. util.strrep("\x8f", inner_width) .. util.spaces(border_width)
+                p_b = util.spaces(border_width) .. util.strrep("\x83", inner_width) .. util.spaces(border_width)
+            end
+
+            p_s = spaces
         end
 
         local p_inv_fg = util.strrep(border_blit, border_width) .. util.strrep(e.fg_bg.blit_bkg, inner_width) ..
@@ -112,10 +126,13 @@ local function rectangle(args)
                     if args.thin == true then
                         e.window.blit(p_a, p_inv_bg, p_inv_fg)
                     else
+                        local _fg = util.trinary(args.even_inner == true, util.strrep(e.fg_bg.blit_bkg, e.frame.w), p_inv_bg)
+                        local _bg = util.trinary(args.even_inner == true, blit_bg_top_bot, p_inv_fg)
+
                         if width_x2 % 3 == 1 then
-                            e.window.blit(p_b, p_inv_bg, p_inv_fg)
+                            e.window.blit(p_b, _fg, _bg)
                         elseif width_x2 % 3 == 2 then
-                            e.window.blit(p_a, p_inv_bg, p_inv_fg)
+                            e.window.blit(p_a, _fg, _bg)
                         else
                             -- skip line
                             e.window.blit(spaces, blit_fg, blit_bg_sides)
@@ -129,12 +146,19 @@ local function rectangle(args)
                 -- partial pixel fill
                 if args.border.even and y == ((e.frame.h - border_width) + 1) then
                     if args.thin == true then
-                        e.window.blit(p_b, util.strrep(e.fg_bg.blit_bkg, e.frame.w), blit_bg_top_bot)
+                        if args.even_inner == true then
+                            e.window.blit(p_b, blit_bg_top_bot, util.strrep(e.fg_bg.blit_bkg, e.frame.w))
+                        else
+                            e.window.blit(p_b, util.strrep(e.fg_bg.blit_bkg, e.frame.w), blit_bg_top_bot)
+                        end
                     else
+                        local _fg = util.trinary(args.even_inner == true, blit_bg_top_bot, p_inv_fg)
+                        local _bg = util.trinary(args.even_inner == true, util.strrep(e.fg_bg.blit_bkg, e.frame.w), blit_bg_top_bot)
+
                         if width_x2 % 3 == 1 then
-                            e.window.blit(p_a, p_inv_fg, blit_bg_top_bot)
+                            e.window.blit(p_a, _fg, _bg)
-                        elseif width_x2 % 3 == 2 or (args.thin == true) then
+                        elseif width_x2 % 3 == 2 then
-                            e.window.blit(p_b, p_inv_fg, blit_bg_top_bot)
+                            e.window.blit(p_b, _fg, _bg)
                         else
                             -- skip line
                             e.window.blit(spaces, blit_fg, blit_bg_sides)

graphics/elements/textbox.lua

@@ -5,7 +5,7 @@ local util    = require("scada-common.util")
 local core    = require("graphics.core")
 local element = require("graphics.element")
 
-local TEXT_ALIGN = core.graphics.TEXT_ALIGN
+local TEXT_ALIGN = core.TEXT_ALIGN
 
 ---@class textbox_args
 ---@field text string text to show

graphics/events.lua

@@ -0,0 +1,161 @@
+--
+-- Graphics Events and Event Handlers
+--
+
+local util = require("scada-common.util")
+
+local events = {}
+
+---@enum CLICK_BUTTON
+events.CLICK_BUTTON = {
+    GENERIC = 0,
+    LEFT_BUTTON = 1,
+    RIGHT_BUTTON = 2,
+    MID_BUTTON = 3
+}
+
+---@enum CLICK_TYPE
+events.CLICK_TYPE = {
+    TAP = 1,            -- screen tap (complete click)
+    DOWN = 2,           -- button down
+    UP = 3,             -- button up (completed a click)
+    DRAG = 4,           -- mouse dragged
+    SCROLL_DOWN = 5,    -- scroll down
+    SCROLL_UP = 6       -- scroll up
+}
+
+-- create a new 2D coordinate
+---@param x integer
+---@param y integer
+---@return coordinate_2d
+local function _coord2d(x, y) return { x = x, y = y } end
+
+---@class mouse_interaction
+---@field monitor string
+---@field button CLICK_BUTTON
+---@field type CLICK_TYPE
+---@field initial coordinate_2d
+---@field current coordinate_2d
+
+local handler = {
+    -- left, right, middle button down tracking
+    button_down = {
+        _coord2d(0, 0),
+        _coord2d(0, 0),
+        _coord2d(0, 0)
+    }
+}
+
+-- create a new monitor touch mouse interaction event
+---@nodiscard
+---@param monitor string
+---@param x integer
+---@param y integer
+---@return mouse_interaction
+local function _monitor_touch(monitor, x, y)
+    return {
+        monitor = monitor,
+        button = events.CLICK_BUTTON.GENERIC,
+        type = events.CLICK_TYPE.TAP,
+        initial = _coord2d(x, y),
+        current = _coord2d(x, y)
+    }
+end
+
+-- create a new mouse button mouse interaction event
+---@nodiscard
+---@param button CLICK_BUTTON mouse button
+---@param type CLICK_TYPE click type
+---@param x1 integer initial x
+---@param y1 integer initial y
+---@param x2 integer current x
+---@param y2 integer current y
+---@return mouse_interaction
+local function _mouse_event(button, type, x1, y1, x2, y2)
+    return {
+        monitor = "terminal",
+        button = button,
+        type = type,
+        initial = _coord2d(x1, y1),
+        current = _coord2d(x2, y2)
+    }
+end
+
+-- create a new generic mouse interaction event
+---@nodiscard
+---@param type CLICK_TYPE
+---@param x integer
+---@param y integer
+---@return mouse_interaction
+function events.mouse_generic(type, x, y)
+    return {
+        monitor = "",
+        button = events.CLICK_BUTTON.GENERIC,
+        type = type,
+        initial = _coord2d(x, y),
+        current = _coord2d(x, y)
+    }
+end
+
+-- create a new transposed mouse interaction event using the event's monitor/button fields
+---@nodiscard
+---@param event mouse_interaction
+---@param elem_pos_x integer element's x position: new x = (event x - element x) + 1
+---@param elem_pos_y integer element's y position: new y = (event y - element y) + 1
+---@return mouse_interaction
+function events.mouse_transposed(event, elem_pos_x, elem_pos_y)
+    return {
+        monitor = event.monitor,
+        button = event.button,
+        type = event.type,
+        initial = _coord2d((event.initial.x - elem_pos_x) + 1, (event.initial.y - elem_pos_y) + 1),
+        current = _coord2d((event.current.x - elem_pos_x) + 1, (event.current.y - elem_pos_y) + 1)
+    }
+end
+
+-- check if an event qualifies as a click (tap or up)
+---@nodiscard
+---@param t CLICK_TYPE
+function events.was_clicked(t) return t == events.CLICK_TYPE.TAP or t == events.CLICK_TYPE.UP end
+
+-- create a new mouse event to pass onto graphics renderer<br>
+-- supports: mouse_click, mouse_up, mouse_drag, mouse_scroll, and monitor_touch
+---@param event_type os_event OS event to handle
+---@param opt integer|string button, scroll direction, or monitor for monitor touch
+---@param x integer x coordinate
+---@param y integer y coordinate
+---@return mouse_interaction|nil
+function events.new_mouse_event(event_type, opt, x, y)
+    if event_type == "mouse_click" then
+        ---@cast opt 1|2|3
+        handler.button_down[opt] = _coord2d(x, y)
+        return _mouse_event(opt, events.CLICK_TYPE.DOWN, x, y, x, y)
+    elseif event_type == "mouse_up" then
+        ---@cast opt 1|2|3
+        local initial = handler.button_down[opt]    ---@type coordinate_2d
+        return _mouse_event(opt, events.CLICK_TYPE.UP, initial.x, initial.y, x, y)
+    elseif event_type == "monitor_touch" then
+        ---@cast opt string
+        return _monitor_touch(opt, x, y)
+    elseif event_type == "mouse_drag" then
+        ---@cast opt 1|2|3
+        local initial = handler.button_down[opt]    ---@type coordinate_2d
+        return _mouse_event(opt, events.CLICK_TYPE.DRAG, initial.x, initial.y, x, y)
+    elseif event_type == "mouse_scroll" then
+        ---@cast opt 1|-1
+        local scroll_direction = util.trinary(opt == 1, events.CLICK_TYPE.SCROLL_DOWN, events.CLICK_TYPE.SCROLL_UP)
+        return _mouse_event(events.CLICK_BUTTON.GENERIC, scroll_direction, x, y, x, y)
+    end
+end
+
+-- create a new key event to pass onto graphics renderer<br>
+-- supports: char, key, and key_up
+---@param event_type os_event
+function events.new_key_event(event_type)
+    if event_type == "char" then
+    elseif event_type == "key" then
+    elseif event_type == "key_up" then
+    end
+end
+
+return events

imgen.py

@@ -1,5 +1,6 @@
 import json
 import os
+import sys
 
 # list files in a directory
 def list_files(path):
@@ -7,7 +8,7 @@ def list_files(path):
 
     for (root, dirs, files) in os.walk(path):
         for f in files:
-            list.append(root[2:] + "/" + f)
+            list.append((root[2:] + "/" + f).replace('\\','/'))
 
     return list
 
@@ -68,8 +69,8 @@ def make_manifest(size):
             "pocket" : list_files("./pocket"),
         },
         "depends" : {
-            "reactor-plc" : [ "system", "common" ],
+            "reactor-plc" : [ "system", "common", "graphics" ],
-            "rtu" : [ "system", "common" ],
+            "rtu" : [ "system", "common", "graphics" ],
             "supervisor" : [ "system", "common" ],
             "coordinator" : [ "system", "common", "graphics" ],
             "pocket" : [ "system", "common", "graphics" ]
@@ -100,7 +101,30 @@ f.close()
 
 manifest_size = os.path.getsize("install_manifest.json")
 
+final_manifest = make_manifest(manifest_size)
+
 # calculate file size then regenerate with embedded size
 f = open("install_manifest.json", "w")
-json.dump(make_manifest(manifest_size), f)
+json.dump(final_manifest, f)
 f.close()
+
+if len(sys.argv) > 1 and sys.argv[1] == "shields":
+    # write all the JSON files for shields.io
+    for key, version in final_manifest["versions"].items():
+        f = open("./shields/" + key + ".json", "w")
+
+        if version.find("alpha") >= 0:
+            color = "yellow"
+        elif version.find("beta") >= 0:
+            color = "orange"
+        else:
+            color = "blue"
+
+        json.dump({
+            "schemaVersion": 1,
+            "label": key,
+            "message": "" + version,
+            "color": color
+        }, f)
+
+        f.close()

pocket/config.lua

@@ -0,0 +1,23 @@
+local config = {}
+
+-- port of the SCADA supervisor
+config.SCADA_SV_PORT = 16100
+-- port for SCADA coordinator API access
+config.SCADA_API_PORT = 16200
+-- port to listen to incoming packets FROM servers
+config.LISTEN_PORT = 16201
+-- max trusted modem message distance (0 to disable check)
+config.TRUSTED_RANGE = 0
+-- time in seconds (>= 2) before assuming a remote device is no longer active
+config.COMMS_TIMEOUT = 5
+
+-- log path
+config.LOG_PATH = "/log.txt"
+-- log mode
+--  0 = APPEND (adds to existing file on start)
+--  1 = NEW (replaces existing file on start)
+config.LOG_MODE = 0
+-- true to log verbose debug messages
+config.LOG_DEBUG = false
+
+return config

pocket/coreio.lua

@@ -0,0 +1,35 @@
+--
+-- Core I/O - Pocket Central I/O Management
+--
+
+local psil = require("scada-common.psil")
+
+local coreio = {}
+
+---@class pocket_core_io
+local io = {
+    ps = psil.create()
+}
+
+---@enum POCKET_LINK_STATE
+local LINK_STATE = {
+    UNLINKED = 0,
+    SV_LINK_ONLY = 1,
+    API_LINK_ONLY = 2,
+    LINKED = 3
+}
+
+coreio.LINK_STATE = LINK_STATE
+
+-- get the core PSIL
+function coreio.core_ps()
+    return io.ps
+end
+
+-- set network link state
+---@param state POCKET_LINK_STATE
+function coreio.report_link_state(state)
+    io.ps.publish("link_state", state)
+end
+
+return coreio

pocket/pocket.lua

@@ -0,0 +1,408 @@
+local comms  = require("scada-common.comms")
+local log    = require("scada-common.log")
+local util   = require("scada-common.util")
+
+local coreio = require("pocket.coreio")
+
+local PROTOCOL = comms.PROTOCOL
+local DEVICE_TYPE = comms.DEVICE_TYPE
+local ESTABLISH_ACK = comms.ESTABLISH_ACK
+local SCADA_MGMT_TYPE = comms.SCADA_MGMT_TYPE
+-- local CAPI_TYPE = comms.CAPI_TYPE
+
+local LINK_STATE = coreio.LINK_STATE
+
+local pocket = {}
+
+-- pocket coordinator + supervisor communications
+---@nodiscard
+---@param version string pocket version
+---@param modem table modem device
+---@param local_port integer local pocket port
+---@param sv_port integer port of supervisor
+---@param api_port integer port of coordinator API
+---@param range integer trusted device connection range
+---@param sv_watchdog watchdog
+---@param api_watchdog watchdog
+function pocket.comms(version, modem, local_port, sv_port, api_port, range, sv_watchdog, api_watchdog)
+    local self = {
+        sv = {
+            linked = false,
+            seq_num = 0,
+            r_seq_num = nil,    ---@type nil|integer
+            last_est_ack = ESTABLISH_ACK.ALLOW
+        },
+        api = {
+            linked = false,
+            seq_num = 0,
+            r_seq_num = nil,    ---@type nil|integer
+            last_est_ack = ESTABLISH_ACK.ALLOW
+        },
+        establish_delay_counter = 0
+    }
+
+    comms.set_trusted_range(range)
+
+    -- PRIVATE FUNCTIONS --
+
+    -- configure modem channels
+    local function _conf_channels()
+        modem.closeAll()
+        modem.open(local_port)
+    end
+
+    _conf_channels()
+
+    -- send a management packet to the supervisor
+    ---@param msg_type SCADA_MGMT_TYPE
+    ---@param msg table
+    local function _send_sv(msg_type, msg)
+        local s_pkt = comms.scada_packet()
+        local pkt = comms.mgmt_packet()
+
+        pkt.make(msg_type, msg)
+        s_pkt.make(self.sv.seq_num, PROTOCOL.SCADA_MGMT, pkt.raw_sendable())
+
+        modem.transmit(sv_port, local_port, s_pkt.raw_sendable())
+        self.sv.seq_num = self.sv.seq_num + 1
+    end
+
+    -- send a management packet to the coordinator
+    ---@param msg_type SCADA_MGMT_TYPE
+    ---@param msg table
+    local function _send_crd(msg_type, msg)
+        local s_pkt = comms.scada_packet()
+        local pkt = comms.mgmt_packet()
+
+        pkt.make(msg_type, msg)
+        s_pkt.make(self.api.seq_num, PROTOCOL.SCADA_MGMT, pkt.raw_sendable())
+
+        modem.transmit(api_port, local_port, s_pkt.raw_sendable())
+        self.api.seq_num = self.api.seq_num + 1
+    end
+
+    -- send a packet to the coordinator API
+    -----@param msg_type CAPI_TYPE
+    -----@param msg table
+    -- local function _send_api(msg_type, msg)
+    --     local s_pkt = comms.scada_packet()
+    --     local pkt = comms.capi_packet()
+
+    --     pkt.make(msg_type, msg)
+    --     s_pkt.make(self.api.seq_num, PROTOCOL.COORD_API, pkt.raw_sendable())
+
+    --     modem.transmit(api_port, local_port, s_pkt.raw_sendable())
+    --     self.api.seq_num = self.api.seq_num + 1
+    -- end
+
+    -- attempt supervisor connection establishment
+    local function _send_sv_establish()
+        _send_sv(SCADA_MGMT_TYPE.ESTABLISH, { comms.version, version, DEVICE_TYPE.PKT })
+    end
+
+    -- attempt coordinator API connection establishment
+    local function _send_api_establish()
+        _send_crd(SCADA_MGMT_TYPE.ESTABLISH, { comms.version, version, DEVICE_TYPE.PKT })
+    end
+
+    -- keep alive ack to supervisor
+    ---@param srv_time integer
+    local function _send_sv_keep_alive_ack(srv_time)
+        _send_sv(SCADA_MGMT_TYPE.KEEP_ALIVE, { srv_time, util.time() })
+    end
+
+    -- keep alive ack to coordinator
+    ---@param srv_time integer
+    local function _send_api_keep_alive_ack(srv_time)
+        _send_crd(SCADA_MGMT_TYPE.KEEP_ALIVE, { srv_time, util.time() })
+    end
+
+    -- PUBLIC FUNCTIONS --
+
+    ---@class pocket_comms
+    local public = {}
+
+    -- reconnect a newly connected modem
+    ---@param new_modem table
+    function public.reconnect_modem(new_modem)
+        modem = new_modem
+        _conf_channels()
+    end
+
+    -- close connection to the supervisor
+    function public.close_sv()
+        sv_watchdog.cancel()
+        self.sv.linked = false
+        _send_sv(SCADA_MGMT_TYPE.CLOSE, {})
+    end
+
+    -- close connection to coordinator API server
+    function public.close_api()
+        api_watchdog.cancel()
+        self.api.linked = false
+        _send_crd(SCADA_MGMT_TYPE.CLOSE, {})
+    end
+
+    -- close the connections to the servers
+    function public.close()
+        public.close_sv()
+        public.close_api()
+    end
+
+    -- attempt to re-link if any of the dependent links aren't active
+    function public.link_update()
+        if not self.sv.linked then
+            coreio.report_link_state(util.trinary(self.api.linked, LINK_STATE.API_LINK_ONLY, LINK_STATE.UNLINKED))
+
+            if self.establish_delay_counter <= 0 then
+                _send_sv_establish()
+                self.establish_delay_counter = 4
+            else
+                self.establish_delay_counter = self.establish_delay_counter - 1
+            end
+        elseif not self.api.linked then
+            coreio.report_link_state(LINK_STATE.SV_LINK_ONLY)
+
+            if self.establish_delay_counter <= 0 then
+                _send_api_establish()
+                self.establish_delay_counter = 4
+            else
+                self.establish_delay_counter = self.establish_delay_counter - 1
+            end
+        else
+            -- linked, all good!
+            coreio.report_link_state(LINK_STATE.LINKED)
+        end
+    end
+
+    -- parse a packet
+    ---@param side string
+    ---@param sender integer
+    ---@param reply_to integer
+    ---@param message any
+    ---@param distance integer
+    ---@return mgmt_frame|capi_frame|nil packet
+    function public.parse_packet(side, sender, reply_to, message, distance)
+        local pkt = nil
+        local s_pkt = comms.scada_packet()
+
+        -- parse packet as generic SCADA packet
+        s_pkt.receive(side, sender, reply_to, message, distance)
+
+        if s_pkt.is_valid() then
+            -- get as SCADA management packet
+            if s_pkt.protocol() == PROTOCOL.SCADA_MGMT then
+                local mgmt_pkt = comms.mgmt_packet()
+                if mgmt_pkt.decode(s_pkt) then
+                    pkt = mgmt_pkt.get()
+                end
+            -- get as coordinator API packet
+            elseif s_pkt.protocol() == PROTOCOL.COORD_API then
+                local capi_pkt = comms.capi_packet()
+                if capi_pkt.decode(s_pkt) then
+                    pkt = capi_pkt.get()
+                end
+            else
+                log.debug("attempted parse of illegal packet type " .. s_pkt.protocol(), true)
+            end
+        end
+
+        return pkt
+    end
+
+    -- handle a packet
+    ---@param packet mgmt_frame|capi_frame|nil
+    function public.handle_packet(packet)
+        if packet ~= nil then
+            local l_port = packet.scada_frame.local_port()
+            local r_port = packet.scada_frame.remote_port()
+            local protocol = packet.scada_frame.protocol()
+
+            if l_port ~= local_port then
+                log.debug("received packet on unconfigured channel " .. l_port, true)
+            elseif r_port == api_port then
+                -- check sequence number
+                if self.api.r_seq_num == nil then
+                    self.api.r_seq_num = packet.scada_frame.seq_num()
+                elseif self.connected and ((self.api.r_seq_num + 1) ~= packet.scada_frame.seq_num()) then
+                    log.warning("sequence out-of-order: last = " .. self.api.r_seq_num .. ", new = " .. packet.scada_frame.seq_num())
+                    return
+                else
+                    self.api.r_seq_num = packet.scada_frame.seq_num()
+                end
+
+                -- feed watchdog on valid sequence number
+                api_watchdog.feed()
+
+                if protocol == PROTOCOL.COORD_API then
+                    ---@cast packet capi_frame
+                elseif protocol == PROTOCOL.SCADA_MGMT then
+                    ---@cast packet mgmt_frame
+                    if packet.type == SCADA_MGMT_TYPE.ESTABLISH then
+                        -- connection with coordinator established
+                        if packet.length == 1 then
+                            local est_ack = packet.data[1]
+
+                            if est_ack == ESTABLISH_ACK.ALLOW then
+                                log.info("coordinator connection established")
+                                self.establish_delay_counter = 0
+                                self.api.linked = true
+
+                                if self.sv.linked then
+                                    coreio.report_link_state(LINK_STATE.LINKED)
+                                else
+                                    coreio.report_link_state(LINK_STATE.API_LINK_ONLY)
+                                end
+                            elseif est_ack == ESTABLISH_ACK.DENY then
+                                if self.api.last_est_ack ~= est_ack then
+                                    log.info("coordinator connection denied")
+                                end
+                            elseif est_ack == ESTABLISH_ACK.COLLISION then
+                                if self.api.last_est_ack ~= est_ack then
+                                    log.info("coordinator connection denied due to collision")
+                                end
+                            elseif est_ack == ESTABLISH_ACK.BAD_VERSION then
+                                if self.api.last_est_ack ~= est_ack then
+                                    log.info("coordinator comms version mismatch")
+                                end
+                            else
+                                log.debug("coordinator SCADA_MGMT establish packet reply unsupported")
+                            end
+
+                            self.api.last_est_ack = est_ack
+                        else
+                            log.debug("coordinator SCADA_MGMT establish packet length mismatch")
+                        end
+                    elseif self.api.linked then
+                        if packet.type == SCADA_MGMT_TYPE.KEEP_ALIVE then
+                            -- keep alive request received, echo back
+                            if packet.length == 1 then
+                                local timestamp = packet.data[1]
+                                local trip_time = util.time() - timestamp
+
+                                if trip_time > 750 then
+                                    log.warning("pocket coordinator KEEP_ALIVE trip time > 750ms (" .. trip_time .. "ms)")
+                                end
+
+                                -- log.debug("pocket coordinator RTT = " .. trip_time .. "ms")
+
+                                _send_api_keep_alive_ack(timestamp)
+                            else
+                                log.debug("coordinator SCADA keep alive packet length mismatch")
+                            end
+                        elseif packet.type == SCADA_MGMT_TYPE.CLOSE then
+                            -- handle session close
+                            api_watchdog.cancel()
+                            self.api.linked = false
+                            log.info("coordinator server connection closed by remote host")
+                        else
+                            log.debug("received unknown SCADA_MGMT packet type " .. packet.type .. " from coordinator")
+                        end
+                    else
+                        log.debug("discarding coordinator non-link SCADA_MGMT packet before linked")
+                    end
+                else
+                    log.debug("illegal packet type " .. protocol .. " from coordinator", true)
+                end
+            elseif r_port == sv_port then
+                -- check sequence number
+                if self.sv.r_seq_num == nil then
+                    self.sv.r_seq_num = packet.scada_frame.seq_num()
+                elseif self.connected and ((self.sv.r_seq_num + 1) ~= packet.scada_frame.seq_num()) then
+                    log.warning("sequence out-of-order: last = " .. self.sv.r_seq_num .. ", new = " .. packet.scada_frame.seq_num())
+                    return
+                else
+                    self.sv.r_seq_num = packet.scada_frame.seq_num()
+                end
+
+                -- feed watchdog on valid sequence number
+                sv_watchdog.feed()
+
+                -- handle packet
+                if protocol == PROTOCOL.SCADA_MGMT then
+                    ---@cast packet mgmt_frame
+                    if packet.type == SCADA_MGMT_TYPE.ESTABLISH then
+                        -- connection with supervisor established
+                        if packet.length == 1 then
+                            local est_ack = packet.data[1]
+
+                            if est_ack == ESTABLISH_ACK.ALLOW then
+                                log.info("supervisor connection established")
+                                self.establish_delay_counter = 0
+                                self.sv.linked = true
+
+                                if self.api.linked then
+                                    coreio.report_link_state(LINK_STATE.LINKED)
+                                else
+                                    coreio.report_link_state(LINK_STATE.SV_LINK_ONLY)
+                                end
+                            elseif est_ack == ESTABLISH_ACK.DENY then
+                                if self.sv.last_est_ack ~= est_ack then
+                                    log.info("supervisor connection denied")
+                                end
+                            elseif est_ack == ESTABLISH_ACK.COLLISION then
+                                if self.sv.last_est_ack ~= est_ack then
+                                    log.info("supervisor connection denied due to collision")
+                                end
+                            elseif est_ack == ESTABLISH_ACK.BAD_VERSION then
+                                if self.sv.last_est_ack ~= est_ack then
+                                    log.info("supervisor comms version mismatch")
+                                end
+                            else
+                                log.debug("supervisor SCADA_MGMT establish packet reply unsupported")
+                            end
+
+                            self.sv.last_est_ack = est_ack
+                        else
+                            log.debug("supervisor SCADA_MGMT establish packet length mismatch")
+                        end
+                    elseif self.sv.linked then
+                        if packet.type == SCADA_MGMT_TYPE.KEEP_ALIVE then
+                            -- keep alive request received, echo back
+                            if packet.length == 1 then
+                                local timestamp = packet.data[1]
+                                local trip_time = util.time() - timestamp
+
+                                if trip_time > 750 then
+                                    log.warning("pocket supervisor KEEP_ALIVE trip time > 750ms (" .. trip_time .. "ms)")
+                                end
+
+                                -- log.debug("pocket supervisor RTT = " .. trip_time .. "ms")
+
+                                _send_sv_keep_alive_ack(timestamp)
+                            else
+                                log.debug("supervisor SCADA keep alive packet length mismatch")
+                            end
+                        elseif packet.type == SCADA_MGMT_TYPE.CLOSE then
+                            -- handle session close
+                            sv_watchdog.cancel()
+                            self.sv.linked = false
+                            log.info("supervisor server connection closed by remote host")
+                        else
+                            log.debug("received unknown SCADA_MGMT packet type " .. packet.type .. " from supervisor")
+                        end
+                    else
+                        log.debug("discarding supervisor non-link SCADA_MGMT packet before linked")
+                    end
+                else
+                    log.debug("illegal packet type " .. protocol .. " from supervisor", true)
+                end
+            else
+                log.debug("received packet from unconfigured channel " .. r_port, true)
+            end
+        end
+    end
+
+    -- check if we are still linked with the supervisor
+    ---@nodiscard
+    function public.is_sv_linked() return self.sv.linked end
+
+    -- check if we are still linked with the coordinator
+    ---@nodiscard
+    function public.is_api_linked() return self.api.linked end
+
+    return public
+end
+
+
+return pocket

pocket/renderer.lua

@@ -0,0 +1,80 @@
+--
+-- Graphics Rendering Control
+--
+
+local main_view  = require("pocket.ui.main")
+local style      = require("pocket.ui.style")
+
+local flasher    = require("graphics.flasher")
+
+local DisplayBox = require("graphics.elements.displaybox")
+
+local renderer = {}
+
+local ui = {
+    display = nil
+}
+
+-- start the pocket GUI
+function renderer.start_ui()
+    if ui.display == nil then
+        -- reset screen
+        term.setTextColor(colors.white)
+        term.setBackgroundColor(colors.black)
+        term.clear()
+        term.setCursorPos(1, 1)
+
+        -- set overridden colors
+        for i = 1, #style.colors do
+            term.setPaletteColor(style.colors[i].c, style.colors[i].hex)
+        end
+
+        -- init front panel view
+        ui.display = DisplayBox{window=term.current(),fg_bg=style.root}
+        main_view(ui.display)
+
+        -- start flasher callback task
+        flasher.run()
+    end
+end
+
+-- close out the UI
+function renderer.close_ui()
+    if ui.display ~= nil then
+        -- stop blinking indicators
+        flasher.clear()
+
+        -- hide to stop animation callbacks
+        ui.display.hide()
+
+        -- clear root UI elements
+        ui.display = nil
+
+        -- restore colors
+        for i = 1, #style.colors do
+            local r, g, b = term.nativePaletteColor(style.colors[i].c)
+            term.setPaletteColor(style.colors[i].c, r, g, b)
+        end
+
+        -- reset terminal
+        term.setTextColor(colors.white)
+        term.setBackgroundColor(colors.black)
+        term.clear()
+        term.setCursorPos(1, 1)
+    end
+end
+
+-- is the UI ready?
+---@nodiscard
+---@return boolean ready
+function renderer.ui_ready() return ui.display ~= nil end
+
+-- handle a mouse event
+---@param event mouse_interaction|nil
+function renderer.handle_mouse(event)
+    if ui.display ~= nil and event ~= nil then
+        ui.display.handle_mouse(event)
+    end
+end
+
+return renderer

pocket/startup.lua

@@ -1,16 +1,180 @@
 --
--- SCADA Coordinator Access on a Pocket Computer
+-- SCADA System Access on a Pocket Computer
 --
 
 require("/initenv").init_env()
 
-local util = require("scada-common.util")
+local crash        = require("scada-common.crash")
+local log          = require("scada-common.log")
+local ppm          = require("scada-common.ppm")
+local tcallbackdsp = require("scada-common.tcallbackdsp")
+local util         = require("scada-common.util")
 
-local POCKET_VERSION = "alpha-v0.0.0"
+local core         = require("graphics.core")
+
+local config       = require("pocket.config")
+local coreio       = require("pocket.coreio")
+local pocket       = require("pocket.pocket")
+local renderer     = require("pocket.renderer")
+
+local POCKET_VERSION = "alpha-v0.3.1"
 
-local print = util.print
 local println = util.println
-local print_ts = util.print_ts
 local println_ts = util.println_ts
 
-println("Sorry, this isn't written yet :(")
+----------------------------------------
+-- config validation
+----------------------------------------
+
+local cfv = util.new_validator()
+
+cfv.assert_port(config.SCADA_SV_PORT)
+cfv.assert_port(config.SCADA_API_PORT)
+cfv.assert_port(config.LISTEN_PORT)
+cfv.assert_type_int(config.TRUSTED_RANGE)
+cfv.assert_type_num(config.COMMS_TIMEOUT)
+cfv.assert_min(config.COMMS_TIMEOUT, 2)
+cfv.assert_type_str(config.LOG_PATH)
+cfv.assert_type_int(config.LOG_MODE)
+
+assert(cfv.valid(), "bad config file: missing/invalid fields")
+
+----------------------------------------
+-- log init
+----------------------------------------
+
+log.init(config.LOG_PATH, config.LOG_MODE, config.LOG_DEBUG == true)
+
+log.info("========================================")
+log.info("BOOTING pocket.startup " .. POCKET_VERSION)
+log.info("========================================")
+
+crash.set_env("pocket", POCKET_VERSION)
+
+----------------------------------------
+-- main application
+----------------------------------------
+
+local function main()
+    ----------------------------------------
+    -- system startup
+    ----------------------------------------
+
+    -- mount connected devices
+    ppm.mount_all()
+
+    ----------------------------------------
+    -- setup communications & clocks
+    ----------------------------------------
+
+    coreio.report_link_state(coreio.LINK_STATE.UNLINKED)
+
+    -- get the communications modem
+    local modem = ppm.get_wireless_modem()
+    if modem == nil then
+        println("startup> wireless modem not found: please craft the pocket computer with a wireless modem")
+        log.fatal("startup> no wireless modem on startup")
+        return
+    end
+
+    -- create connection watchdogs
+    local conn_wd = {
+        sv = util.new_watchdog(config.COMMS_TIMEOUT),
+        api = util.new_watchdog(config.COMMS_TIMEOUT)
+    }
+
+    conn_wd.sv.cancel()
+    conn_wd.api.cancel()
+
+    log.debug("startup> conn watchdogs created")
+
+    -- start comms, open all channels
+    local pocket_comms = pocket.comms(POCKET_VERSION, modem, config.LISTEN_PORT, config.SCADA_SV_PORT,
+                                        config.SCADA_API_PORT, config.TRUSTED_RANGE, conn_wd.sv, conn_wd.api)
+    log.debug("startup> comms init")
+
+    -- base loop clock (2Hz, 10 ticks)
+    local MAIN_CLOCK = 0.5
+    local loop_clock = util.new_clock(MAIN_CLOCK)
+
+    ----------------------------------------
+    -- start the UI
+    ----------------------------------------
+
+    local ui_ok, message = pcall(renderer.start_ui)
+    if not ui_ok then
+        renderer.close_ui()
+        println(util.c("UI error: ", message))
+        log.error(util.c("startup> GUI crashed with error ", message))
+    else
+        -- start clock
+        loop_clock.start()
+    end
+
+    ----------------------------------------
+    -- main event loop
+    ----------------------------------------
+
+    if ui_ok then
+        -- start connection watchdogs
+        conn_wd.sv.feed()
+        conn_wd.api.feed()
+        log.debug("startup> conn watchdog started")
+    end
+
+    -- main event loop
+    while ui_ok do
+        local event, param1, param2, param3, param4, param5 = util.pull_event()
+
+        -- handle event
+        if event == "timer" then
+            if loop_clock.is_clock(param1) then
+                -- main loop tick
+
+                -- relink if necessary
+                pocket_comms.link_update()
+
+                loop_clock.start()
+            elseif conn_wd.sv.is_timer(param1) then
+                -- supervisor watchdog timeout
+                log.info("supervisor server timeout")
+                pocket_comms.close_sv()
+            elseif conn_wd.api.is_timer(param1) then
+                -- coordinator watchdog timeout
+                log.info("coordinator api server timeout")
+                pocket_comms.close_api()
+            else
+                -- a non-clock/main watchdog timer event
+                -- notify timer callback dispatcher
+                tcallbackdsp.handle(param1)
+            end
+        elseif event == "modem_message" then
+            -- got a packet
+            local packet = pocket_comms.parse_packet(param1, param2, param3, param4, param5)
+            pocket_comms.handle_packet(packet)
+        elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll" then
+            -- handle a monitor touch event
+            renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))
+        end
+
+        -- check for termination request
+        if event == "terminate" or ppm.should_terminate() then
+            log.info("terminate requested, closing server connections...")
+            pocket_comms.close()
+            log.info("connections closed")
+            break
+        end
+    end
+
+    renderer.close_ui()
+
+    println_ts("exited")
+    log.info("exited")
+end
+
+if not xpcall(main, crash.handler) then
+    pcall(renderer.close_ui)
+    crash.exit()
+else
+    log.close()
+end

pocket/ui/components/boiler_page.lua

@@ -0,0 +1,22 @@
+-- local style   = require("pocket.ui.style")
+
+local core    = require("graphics.core")
+
+local Div     = require("graphics.elements.div")
+local TextBox = require("graphics.elements.textbox")
+
+-- local cpair = core.cpair
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+-- new boiler page view
+---@param root graphics_element parent
+local function new_view(root)
+    local main = Div{parent=root,x=1,y=1}
+
+    TextBox{parent=main,text="BOILERS",x=1,y=1,height=1,alignment=TEXT_ALIGN.CENTER}
+
+    return main
+end
+
+return new_view

pocket/ui/components/conn_waiting.lua

@@ -0,0 +1,41 @@
+--
+-- Connection Waiting Spinner
+--
+
+local style       = require("pocket.ui.style")
+
+local core        = require("graphics.core")
+
+local Div         = require("graphics.elements.div")
+local TextBox     = require("graphics.elements.textbox")
+
+local WaitingAnim = require("graphics.elements.animations.waiting")
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+local cpair = core.cpair
+
+-- create a waiting view
+---@param parent graphics_element parent
+---@param y integer y offset
+local function init(parent, y, is_api)
+    -- root div
+    local root = Div{parent=parent,x=1,y=1}
+
+    -- bounding box div
+    local box = Div{parent=root,x=1,y=y,height=5}
+
+    local waiting_x = math.floor(parent.width() / 2) - 1
+
+    if is_api then
+        WaitingAnim{parent=box,x=waiting_x,y=1,fg_bg=cpair(colors.blue,style.root.bkg)}
+        TextBox{parent=box,text="Connecting to API",alignment=TEXT_ALIGN.CENTER,y=5,height=1,fg_bg=cpair(colors.white,style.root.bkg)}
+    else
+        WaitingAnim{parent=box,x=waiting_x,y=1,fg_bg=cpair(colors.green,style.root.bkg)}
+        TextBox{parent=box,text="Connecting to Supervisor",alignment=TEXT_ALIGN.CENTER,y=5,height=1,fg_bg=cpair(colors.white,style.root.bkg)}
+    end
+
+    return root
+end
+
+return init

pocket/ui/components/home_page.lua

@@ -0,0 +1,22 @@
+-- local style   = require("pocket.ui.style")
+
+local core    = require("graphics.core")
+
+local Div     = require("graphics.elements.div")
+local TextBox = require("graphics.elements.textbox")
+
+-- local cpair = core.cpair
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+-- new home page view
+---@param root graphics_element parent
+local function new_view(root)
+    local main = Div{parent=root,x=1,y=1}
+
+    TextBox{parent=main,text="HOME",x=1,y=1,height=1,alignment=TEXT_ALIGN.CENTER}
+
+    return main
+end
+
+return new_view

pocket/ui/components/reactor_page.lua

@@ -0,0 +1,22 @@
+-- local style   = require("pocket.ui.style")
+
+local core    = require("graphics.core")
+
+local Div     = require("graphics.elements.div")
+local TextBox = require("graphics.elements.textbox")
+
+-- local cpair = core.cpair
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+-- new reactor page view
+---@param root graphics_element parent
+local function new_view(root)
+    local main = Div{parent=root,x=1,y=1}
+
+    TextBox{parent=main,text="REACTOR",x=1,y=1,height=1,alignment=TEXT_ALIGN.CENTER}
+
+    return main
+end
+
+return new_view

pocket/ui/components/turbine_page.lua

@@ -0,0 +1,22 @@
+-- local style   = require("pocket.ui.style")
+
+local core    = require("graphics.core")
+
+local Div     = require("graphics.elements.div")
+local TextBox = require("graphics.elements.textbox")
+
+-- local cpair = core.cpair
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+-- new turbine page view
+---@param root graphics_element parent
+local function new_view(root)
+    local main = Div{parent=root,x=1,y=1}
+
+    TextBox{parent=main,text="TURBINES",x=1,y=1,height=1,alignment=TEXT_ALIGN.CENTER}
+
+    return main
+end
+
+return new_view

pocket/ui/components/unit_page.lua

@@ -0,0 +1,22 @@
+-- local style   = require("pocket.ui.style")
+
+local core    = require("graphics.core")
+
+local Div     = require("graphics.elements.div")
+local TextBox = require("graphics.elements.textbox")
+
+-- local cpair = core.cpair
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+-- new unit page view
+---@param root graphics_element parent
+local function new_view(root)
+    local main = Div{parent=root,x=1,y=1}
+
+    TextBox{parent=main,text="UNITS",x=1,y=1,height=1,alignment=TEXT_ALIGN.CENTER}
+
+    return main
+end
+
+return new_view

pocket/ui/main.lua

@@ -0,0 +1,99 @@
+--
+-- Pocket GUI Root
+--
+
+local coreio        = require("pocket.coreio")
+
+local style        = require("pocket.ui.style")
+
+local conn_waiting = require("pocket.ui.components.conn_waiting")
+
+local home_page    = require("pocket.ui.components.home_page")
+local unit_page    = require("pocket.ui.components.unit_page")
+local reactor_page = require("pocket.ui.components.reactor_page")
+local boiler_page  = require("pocket.ui.components.boiler_page")
+local turbine_page = require("pocket.ui.components.turbine_page")
+
+local core         = require("graphics.core")
+
+local Div          = require("graphics.elements.div")
+local MultiPane    = require("graphics.elements.multipane")
+local TextBox      = require("graphics.elements.textbox")
+
+local Sidebar      = require("graphics.elements.controls.sidebar")
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+local cpair = core.cpair
+
+-- create new main view
+---@param main graphics_element main displaybox
+local function init(main)
+    -- window header message
+    TextBox{parent=main,y=1,text="",alignment=TEXT_ALIGN.LEFT,height=1,fg_bg=style.header}
+
+    --
+    -- root panel panes (connection screens + main screen)
+    --
+
+    local root_pane_div = Div{parent=main,x=1,y=2}
+
+    local conn_sv_wait = conn_waiting(root_pane_div, 6, false)
+    local conn_api_wait = conn_waiting(root_pane_div, 6, true)
+    local main_pane = Div{parent=main,x=1,y=2}
+    local root_panes = { conn_sv_wait, conn_api_wait, main_pane }
+
+    local root_pane = MultiPane{parent=root_pane_div,x=1,y=1,panes=root_panes}
+
+    root_pane.register(coreio.core_ps(), "link_state", function (state)
+        if state == coreio.LINK_STATE.UNLINKED or state == coreio.LINK_STATE.API_LINK_ONLY then
+            root_pane.set_value(1)
+        elseif state == coreio.LINK_STATE.SV_LINK_ONLY then
+            root_pane.set_value(2)
+        else
+            root_pane.set_value(3)
+        end
+    end)
+
+    --
+    -- main page panel panes & sidebar
+    --
+
+    local page_div = Div{parent=main_pane,x=4,y=1}
+
+    local sidebar_tabs = {
+        {
+            char = "#",
+            color = cpair(colors.black,colors.green)
+        },
+        {
+            char = "U",
+            color = cpair(colors.black,colors.yellow)
+        },
+        {
+            char = "R",
+            color = cpair(colors.black,colors.cyan)
+        },
+        {
+            char = "B",
+            color = cpair(colors.black,colors.lightGray)
+        },
+        {
+            char = "T",
+            color = cpair(colors.black,colors.white)
+        }
+    }
+
+    local pane_1 = home_page(page_div)
+    local pane_2 = unit_page(page_div)
+    local pane_3 = reactor_page(page_div)
+    local pane_4 = boiler_page(page_div)
+    local pane_5 = turbine_page(page_div)
+    local panes = { pane_1, pane_2, pane_3, pane_4, pane_5 }
+
+    local page_pane = MultiPane{parent=page_div,x=1,y=1,panes=panes}
+
+    Sidebar{parent=main_pane,x=1,y=1,tabs=sidebar_tabs,fg_bg=cpair(colors.white,colors.gray),callback=page_pane.set_value}
+end
+
+return init

pocket/ui/style.lua

@@ -0,0 +1,158 @@
+--
+-- Graphics Style Options
+--
+
+local core = require("graphics.core")
+
+local style = {}
+
+local cpair = core.cpair
+
+-- GLOBAL --
+
+style.root = cpair(colors.white, colors.black)
+style.header = cpair(colors.white, colors.gray)
+style.label = cpair(colors.gray, colors.lightGray)
+
+style.colors = {
+    { c = colors.red,       hex = 0xdf4949 },
+    { c = colors.orange,    hex = 0xffb659 },
+    { c = colors.yellow,    hex = 0xfffc79 },
+    { c = colors.lime,      hex = 0x80ff80 },
+    { c = colors.green,     hex = 0x4aee8a },
+    { c = colors.cyan,      hex = 0x34bac8 },
+    { c = colors.lightBlue, hex = 0x6cc0f2 },
+    { c = colors.blue,      hex = 0x0096ff },
+    { c = colors.purple,    hex = 0xb156ee },
+    { c = colors.pink,      hex = 0xf26ba2 },
+    { c = colors.magenta,   hex = 0xf9488a },
+    -- { c = colors.white,     hex = 0xf0f0f0 },
+    { c = colors.lightGray, hex = 0xcacaca },
+    { c = colors.gray,      hex = 0x575757 },
+    -- { c = colors.black,     hex = 0x191919 },
+    -- { c = colors.brown,     hex = 0x7f664c }
+}
+
+-- MAIN LAYOUT --
+
+style.reactor = {
+    -- reactor states
+    states = {
+        {
+            color = cpair(colors.black, colors.yellow),
+            text = "PLC OFF-LINE"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "NOT FORMED"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "PLC  FAULT"
+        },
+        {
+            color = cpair(colors.white, colors.gray),
+            text = "DISABLED"
+        },
+        {
+            color = cpair(colors.black, colors.green),
+            text = "ACTIVE"
+        },
+        {
+            color = cpair(colors.black, colors.red),
+            text = "SCRAMMED"
+        },
+        {
+            color = cpair(colors.black, colors.red),
+            text = "FORCE DISABLED"
+        }
+    }
+}
+
+style.boiler = {
+    -- boiler states
+    states = {
+        {
+            color = cpair(colors.black, colors.yellow),
+            text = "OFF-LINE"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "NOT FORMED"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "RTU  FAULT"
+        },
+        {
+            color = cpair(colors.white, colors.gray),
+            text = "IDLE"
+        },
+        {
+            color = cpair(colors.black, colors.green),
+            text = "ACTIVE"
+        }
+    }
+}
+
+style.turbine = {
+    -- turbine states
+    states = {
+        {
+            color = cpair(colors.black, colors.yellow),
+            text = "OFF-LINE"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "NOT FORMED"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "RTU  FAULT"
+        },
+        {
+            color = cpair(colors.white, colors.gray),
+            text = "IDLE"
+        },
+        {
+            color = cpair(colors.black, colors.green),
+            text = "ACTIVE"
+        },
+        {
+            color = cpair(colors.black, colors.red),
+            text = "TRIP"
+        }
+    }
+}
+
+style.imatrix = {
+    -- induction matrix states
+    states = {
+        {
+            color = cpair(colors.black, colors.yellow),
+            text = "OFF-LINE"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "NOT FORMED"
+        },
+        {
+            color = cpair(colors.black, colors.orange),
+            text = "RTU  FAULT"
+        },
+        {
+            color = cpair(colors.black, colors.green),
+            text = "ONLINE"
+        },
+        {
+            color = cpair(colors.black, colors.yellow),
+            text = "LOW CHARGE"
+        },
+        {
+            color = cpair(colors.black, colors.yellow),
+            text = "HIGH  CHARGE"
+        },
+    }
+}
+
+return style

reactor-plc/config.lua

@@ -5,6 +5,10 @@ config.NETWORKED = true
 -- unique reactor ID
 config.REACTOR_ID = 1
 
+-- for offline mode, this redstone interface will turn off (open a valve)
+-- when emergency coolant is needed due to low coolant
+-- config.EMERGENCY_COOL = { side = "right", color = nil }
+
 -- port to send packets TO server
 config.SERVER_PORT = 16000
 -- port to listen to incoming packets FROM server
@@ -20,5 +24,7 @@ config.LOG_PATH = "/log.txt"
 --  0 = APPEND (adds to existing file on start)
 --  1 = NEW (replaces existing file on start)
 config.LOG_MODE = 0
+-- true to log verbose debug messages
+config.LOG_DEBUG = false
 
 return config

reactor-plc/databus.lua

@@ -0,0 +1,105 @@
+--
+-- Data Bus - Central Communication Linking for PLC Front Panel
+--
+
+local log  = require("scada-common.log")
+local psil = require("scada-common.psil")
+local util = require("scada-common.util")
+
+local databus = {}
+
+-- databus PSIL
+databus.ps = psil.create()
+
+local dbus_iface = {
+    rps_scram = function () log.debug("DBUS: unset rps_scram() called") end,
+    rps_reset = function () log.debug("DBUS: unset rps_reset() called") end
+}
+
+-- call to toggle heartbeat signal
+function databus.heartbeat() databus.ps.toggle("heartbeat") end
+
+-- link RPS command functions
+---@param scram function reactor SCRAM function
+---@param reset function RPS reset function
+function databus.link_rps(scram, reset)
+    dbus_iface.rps_scram = scram
+    dbus_iface.rps_reset = reset
+end
+
+-- transmit a command to the RPS to SCRAM
+function databus.rps_scram() dbus_iface.rps_scram() end
+
+-- transmit a command to the RPS to reset
+function databus.rps_reset() dbus_iface.rps_reset() end
+
+-- transmit firmware versions across the bus
+---@param plc_v string PLC version
+---@param comms_v string comms version
+function databus.tx_versions(plc_v, comms_v)
+    databus.ps.publish("version", plc_v)
+    databus.ps.publish("comms_version", comms_v)
+end
+
+-- transmit unit ID across the bus
+---@param id integer unit ID
+function databus.tx_id(id)
+    databus.ps.publish("unit_id", id)
+end
+
+-- transmit hardware status across the bus
+---@param plc_state plc_state
+function databus.tx_hw_status(plc_state)
+    databus.ps.publish("reactor_dev_state", util.trinary(plc_state.no_reactor, 1, util.trinary(plc_state.reactor_formed, 3, 2)))
+    databus.ps.publish("has_modem", not plc_state.no_modem)
+    databus.ps.publish("degraded", plc_state.degraded)
+    databus.ps.publish("init_ok", plc_state.init_ok)
+end
+
+-- transmit thread (routine) statuses
+---@param thread string thread name
+---@param ok boolean thread state
+function databus.tx_rt_status(thread, ok)
+    databus.ps.publish(util.c("routine__", thread), ok)
+end
+
+-- transmit supervisor link state across the bus
+---@param state integer
+function databus.tx_link_state(state)
+    databus.ps.publish("link_state", state)
+end
+
+-- transmit reactor enable state across the bus
+---@param active boolean reactor active
+function databus.tx_reactor_state(active)
+    databus.ps.publish("reactor_active", active)
+end
+
+-- transmit RPS data across the bus
+---@param tripped boolean RPS tripped
+---@param status table RPS status
+---@param emer_cool_active boolean RPS activated the emergency coolant
+function databus.tx_rps(tripped, status, emer_cool_active)
+    databus.ps.publish("rps_scram", tripped)
+    databus.ps.publish("rps_damage", status[1])
+    databus.ps.publish("rps_high_temp", status[2])
+    databus.ps.publish("rps_low_ccool", status[3])
+    databus.ps.publish("rps_high_waste", status[4])
+    databus.ps.publish("rps_high_hcool", status[5])
+    databus.ps.publish("rps_no_fuel", status[6])
+    databus.ps.publish("rps_fault", status[7])
+    databus.ps.publish("rps_timeout", status[8])
+    databus.ps.publish("rps_manual", status[9])
+    databus.ps.publish("rps_automatic", status[10])
+    databus.ps.publish("rps_sysfail", status[11])
+    databus.ps.publish("emer_cool", emer_cool_active)
+end
+
+-- link a function to receive data from the bus
+---@param field string field name
+---@param func function function to link
+function databus.rx_field(field, func)
+    databus.ps.subscribe(field, func)
+end
+
+return databus

reactor-plc/panel/front_panel.lua

@@ -0,0 +1,142 @@
+--
+-- Main SCADA Coordinator GUI
+--
+
+local util       = require("scada-common.util")
+
+local config     = require("reactor-plc.config")
+local databus    = require("reactor-plc.databus")
+
+local style      = require("reactor-plc.panel.style")
+
+local core       = require("graphics.core")
+local flasher    = require("graphics.flasher")
+
+local Div        = require("graphics.elements.div")
+local Rectangle  = require("graphics.elements.rectangle")
+local TextBox    = require("graphics.elements.textbox")
+
+local PushButton = require("graphics.elements.controls.push_button")
+
+local LED        = require("graphics.elements.indicators.led")
+local LEDPair    = require("graphics.elements.indicators.ledpair")
+local RGBLED     = require("graphics.elements.indicators.ledrgb")
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+local cpair = core.cpair
+local border = core.border
+
+-- create new main view
+---@param panel graphics_element main displaybox
+local function init(panel)
+    local header = TextBox{parent=panel,y=1,text="REACTOR PLC - UNIT ?",alignment=TEXT_ALIGN.CENTER,height=1,fg_bg=style.header}
+    header.register(databus.ps, "unit_id", function (id) header.set_value(util.c("REACTOR PLC - UNIT ", id)) end)
+
+    --
+    -- system indicators
+    --
+
+    local system = Div{parent=panel,width=14,height=18,x=2,y=3}
+
+    local init_ok = LED{parent=system,label="STATUS",colors=cpair(colors.green,colors.red)}
+    local heartbeat = LED{parent=system,label="HEARTBEAT",colors=cpair(colors.green,colors.green_off)}
+    system.line_break()
+
+    init_ok.register(databus.ps, "init_ok", init_ok.update)
+    heartbeat.register(databus.ps, "heartbeat", heartbeat.update)
+
+    local reactor = LEDPair{parent=system,label="REACTOR",off=colors.red,c1=colors.yellow,c2=colors.green}
+    local modem = LED{parent=system,label="MODEM",colors=cpair(colors.green,colors.green_off)}
+    local network = RGBLED{parent=system,label="NETWORK",colors={colors.green,colors.red,colors.orange,colors.yellow,colors.gray}}
+    network.update(5)
+    system.line_break()
+
+    reactor.register(databus.ps, "reactor_dev_state", reactor.update)
+    modem.register(databus.ps, "has_modem", modem.update)
+    network.register(databus.ps, "link_state", network.update)
+
+    local rt_main = LED{parent=system,label="RT MAIN",colors=cpair(colors.green,colors.green_off)}
+    local rt_rps  = LED{parent=system,label="RT RPS",colors=cpair(colors.green,colors.green_off)}
+    local rt_cmtx = LED{parent=system,label="RT COMMS TX",colors=cpair(colors.green,colors.green_off)}
+    local rt_cmrx = LED{parent=system,label="RT COMMS RX",colors=cpair(colors.green,colors.green_off)}
+    local rt_sctl = LED{parent=system,label="RT SPCTL",colors=cpair(colors.green,colors.green_off)}
+    system.line_break()
+
+    rt_main.register(databus.ps, "routine__main", rt_main.update)
+    rt_rps.register(databus.ps, "routine__rps", rt_rps.update)
+    rt_cmtx.register(databus.ps, "routine__comms_tx", rt_cmtx.update)
+    rt_cmrx.register(databus.ps, "routine__comms_rx", rt_cmrx.update)
+    rt_sctl.register(databus.ps, "routine__spctl", rt_sctl.update)
+
+    --
+    -- status & controls
+    --
+
+    local status = Div{parent=panel,width=19,height=18,x=17,y=3}
+
+    local active = LED{parent=status,x=2,width=12,label="RCT ACTIVE",colors=cpair(colors.green,colors.green_off)}
+
+    -- only show emergency coolant LED if emergency coolant is configured for this device
+    if type(config.EMERGENCY_COOL) == "table" then
+        local emer_cool = LED{parent=status,x=2,width=14,label="EMER COOLANT",colors=cpair(colors.yellow,colors.yellow_off)}
+        emer_cool.register(databus.ps, "emer_cool", emer_cool.update)
+    end
+
+    local status_trip_rct = Rectangle{parent=status,width=20,height=3,x=1,border=border(1,colors.lightGray,true),even_inner=true,fg_bg=cpair(colors.black,colors.ivory)}
+    local status_trip = Div{parent=status_trip_rct,width=18,height=1,fg_bg=cpair(colors.black,colors.lightGray)}
+    local scram = LED{parent=status_trip,width=10,label="RPS TRIP",colors=cpair(colors.red,colors.red_off),flash=true,period=flasher.PERIOD.BLINK_250_MS}
+
+    local controls_rct = Rectangle{parent=status,width=17,height=3,x=1,border=border(1,colors.white,true),even_inner=true,fg_bg=cpair(colors.black,colors.ivory)}
+    local controls = Div{parent=controls_rct,width=15,height=1,fg_bg=cpair(colors.black,colors.white)}
+    PushButton{parent=controls,x=1,y=1,min_width=7,text="SCRAM",callback=databus.rps_scram,fg_bg=cpair(colors.black,colors.red),active_fg_bg=cpair(colors.black,colors.red_off)}
+    PushButton{parent=controls,x=9,y=1,min_width=7,text="RESET",callback=databus.rps_reset,fg_bg=cpair(colors.black,colors.yellow),active_fg_bg=cpair(colors.black,colors.yellow_off)}
+
+    active.register(databus.ps, "reactor_active", active.update)
+    scram.register(databus.ps, "rps_scram", scram.update)
+
+    --
+    -- about footer
+    --
+
+    local about   = Rectangle{parent=panel,width=32,height=3,x=2,y=16,border=border(1,colors.ivory),thin=true,fg_bg=cpair(colors.black,colors.white)}
+    local fw_v    = TextBox{parent=about,x=2,y=1,text="FW: v00.00.00",alignment=TEXT_ALIGN.LEFT,height=1}
+    local comms_v = TextBox{parent=about,x=17,y=1,text="NT: v00.00.00",alignment=TEXT_ALIGN.LEFT,height=1}
+
+    fw_v.register(databus.ps, "version", function (version) fw_v.set_value(util.c("FW: ", version)) end)
+    comms_v.register(databus.ps, "comms_version", function (version) comms_v.set_value(util.c("NT: v", version)) end)
+
+    --
+    -- rps list
+    --
+
+    local rps = Rectangle{parent=panel,width=16,height=16,x=36,y=3,border=border(1,colors.lightGray),thin=true,fg_bg=cpair(colors.black,colors.lightGray)}
+    local rps_man  = LED{parent=rps,label="MANUAL",colors=cpair(colors.red,colors.red_off)}
+    local rps_auto = LED{parent=rps,label="AUTOMATIC",colors=cpair(colors.red,colors.red_off)}
+    local rps_tmo  = LED{parent=rps,label="TIMEOUT",colors=cpair(colors.red,colors.red_off)}
+    local rps_flt  = LED{parent=rps,label="PLC FAULT",colors=cpair(colors.red,colors.red_off)}
+    local rps_fail = LED{parent=rps,label="RCT FAULT",colors=cpair(colors.red,colors.red_off)}
+    rps.line_break()
+    local rps_dmg  = LED{parent=rps,label="HI DAMAGE",colors=cpair(colors.red,colors.red_off)}
+    local rps_tmp  = LED{parent=rps,label="HI TEMP",colors=cpair(colors.red,colors.red_off)}
+    rps.line_break()
+    local rps_nof  = LED{parent=rps,label="LO FUEL",colors=cpair(colors.red,colors.red_off)}
+    local rps_wst  = LED{parent=rps,label="HI WASTE",colors=cpair(colors.red,colors.red_off)}
+    rps.line_break()
+    local rps_ccl  = LED{parent=rps,label="LO CCOOLANT",colors=cpair(colors.red,colors.red_off)}
+    local rps_hcl  = LED{parent=rps,label="HI HCOOLANT",colors=cpair(colors.red,colors.red_off)}
+
+    rps_man.register(databus.ps, "rps_manual", rps_man.update)
+    rps_auto.register(databus.ps, "rps_automatic", rps_auto.update)
+    rps_tmo.register(databus.ps, "rps_timeout", rps_tmo.update)
+    rps_flt.register(databus.ps, "rps_fault", rps_flt.update)
+    rps_fail.register(databus.ps, "rps_sysfail", rps_fail.update)
+    rps_dmg.register(databus.ps, "rps_damage", rps_dmg.update)
+    rps_tmp.register(databus.ps, "rps_high_temp", rps_tmp.update)
+    rps_nof.register(databus.ps, "rps_no_fuel", rps_nof.update)
+    rps_wst.register(databus.ps, "rps_high_waste", rps_wst.update)
+    rps_ccl.register(databus.ps, "rps_low_ccool", rps_ccl.update)
+    rps_hcl.register(databus.ps, "rps_high_hcool", rps_hcl.update)
+end
+
+return init

reactor-plc/panel/style.lua

@@ -0,0 +1,41 @@
+--
+-- Graphics Style Options
+--
+
+local core = require("graphics.core")
+
+local style = {}
+
+local cpair = core.cpair
+
+-- GLOBAL --
+
+-- remap global colors
+colors.ivory = colors.pink
+colors.red_off = colors.brown
+colors.yellow_off = colors.magenta
+colors.green_off = colors.lime
+
+style.root = cpair(colors.black, colors.ivory)
+style.header = cpair(colors.black, colors.lightGray)
+
+style.colors = {
+    { c = colors.red,       hex = 0xdf4949 },   -- RED ON
+    { c = colors.orange,    hex = 0xffb659 },
+    { c = colors.yellow,    hex = 0xf9fb53 },   -- YELLOW ON
+    { c = colors.lime,      hex = 0x16665a },   -- GREEN OFF
+    { c = colors.green,     hex = 0x6be551 },   -- GREEN ON
+    { c = colors.cyan,      hex = 0x34bac8 },
+    { c = colors.lightBlue, hex = 0x6cc0f2 },
+    { c = colors.blue,      hex = 0x0096ff },
+    { c = colors.purple,    hex = 0xb156ee },
+    { c = colors.pink,      hex = 0xdcd9ca },   -- IVORY
+    { c = colors.magenta,   hex = 0x85862c },   -- YELLOW OFF
+    -- { c = colors.white,     hex = 0xdcd9ca },
+    { c = colors.lightGray, hex = 0xb1b8b3 },
+    { c = colors.gray,      hex = 0x575757 },
+    -- { c = colors.black,     hex = 0x191919 },
+    { c = colors.brown,     hex = 0x672223 }    -- RED OFF
+}
+
+return style

reactor-plc/plc.lua

@@ -1,9 +1,12 @@
-local comms = require("scada-common.comms")
+local comms   = require("scada-common.comms")
-local const = require("scada-common.constants")
+local const   = require("scada-common.constants")
-local log   = require("scada-common.log")
+local log     = require("scada-common.log")
-local ppm   = require("scada-common.ppm")
+local ppm     = require("scada-common.ppm")
-local types = require("scada-common.types")
+local rsio    = require("scada-common.rsio")
-local util  = require("scada-common.util")
+local types   = require("scada-common.types")
+local util    = require("scada-common.util")
+
+local databus = require("reactor-plc.databus")
 
 local plc = {}
 
@@ -18,11 +21,6 @@ local AUTO_ACK = comms.PLC_AUTO_ACK
 
 local RPS_LIMITS = const.RPS_LIMITS
 
-local print = util.print
-local println = util.println
-local print_ts = util.print_ts
-local println_ts = util.println_ts
-
 -- I sure hope the devs don't change this error message, not that it would have safety implications
 -- I wish they didn't change it to be like this
 local PCALL_SCRAM_MSG = "pcall: Scram requires the reactor to be active."
@@ -34,7 +32,8 @@ local PCALL_START_MSG = "pcall: Reactor is already active."
 ---@nodiscard
 ---@param reactor table
 ---@param is_formed boolean
-function plc.rps_init(reactor, is_formed)
+---@param emer_cool nil|table emergency coolant configuration
+function plc.rps_init(reactor, is_formed, emer_cool)
     local state_keys = {
         high_dmg = 1,
         high_temp = 2,
@@ -54,6 +53,7 @@ function plc.rps_init(reactor, is_formed)
         state = { false, false, false, false, false, false, false, false, false, false, false, false },
         reactor_enabled = false,
         enabled_at = 0,
+        emer_cool_active = nil, ---@type boolean
         formed = is_formed,
         force_disabled = false,
         tripped = false,
@@ -69,9 +69,39 @@ function plc.rps_init(reactor, is_formed)
         end
     end
 
-    -- clear reactor access fault flag
+    -- set emergency coolant control (if configured)
-    local function _clear_fault()
+    ---@param state boolean true to enable emergency coolant, false to disable
-        self.state[state_keys.fault] = false
+    local function _set_emer_cool(state)
+        -- check if this was configured: if it's a table, fields have already been validated.
+        if type(emer_cool) == "table" then
+            local level = rsio.digital_write_active(rsio.IO.U_EMER_COOL, state)
+
+            if level ~= false then
+                if rsio.is_color(emer_cool.color) then
+                    local output = rs.getBundledOutput(emer_cool.side)
+
+                    if rsio.digital_write(level) then
+                        output = colors.combine(output, emer_cool.color)
+                    else
+                        output = colors.subtract(output, emer_cool.color)
+                    end
+
+                    rs.setBundledOutput(emer_cool.side, output)
+                else
+                    rs.setOutput(emer_cool.side, rsio.digital_write(level))
+                end
+
+                if state ~= self.emer_cool_active then
+                    if state then
+                        log.info("RPS: emergency coolant valve OPENED")
+                    else
+                        log.info("RPS: emergency coolant valve CLOSED")
+                    end
+
+                    self.emer_cool_active = state
+                end
+            end
+        end
     end
 
     -- check if the reactor is formed
@@ -348,6 +378,12 @@ function plc.rps_init(reactor, is_formed)
             end
         end
 
+        -- update emergency coolant control if configured
+        _set_emer_cool(self.state[state_keys.low_coolant])
+
+        -- report RPS status
+        databus.tx_rps(self.tripped, self.state, self.emer_cool_active)
+
         return self.tripped, status, first_trip
     end
 
@@ -358,6 +394,8 @@ function plc.rps_init(reactor, is_formed)
     function public.is_tripped() return self.tripped end
     ---@nodiscard
     function public.get_trip_cause() return self.trip_cause end
+    ---@nodiscard
+    function public.is_low_coolant() return self.states[state_keys.low_coolant] end
 
     ---@nodiscard
     function public.is_active() return self.reactor_enabled end
@@ -397,6 +435,9 @@ function plc.rps_init(reactor, is_formed)
         end
     end
 
+    -- link functions with databus
+    databus.link_rps(public.trip_manual, public.reset)
+
     return public
 end
 
@@ -600,8 +641,6 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
         if not reactor.__p_is_faulted() then
             _send(RPLC_TYPE.MEK_STRUCT, mek_data)
             self.resend_build = false
-        else
-            log.error("failed to send structure: PPM fault")
         end
     end
 
@@ -721,7 +760,7 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
                     pkt = mgmt_pkt.get()
                 end
             else
-                log.error("illegal packet type " .. s_pkt.protocol(), true)
+                log.debug("illegal packet type " .. s_pkt.protocol(), true)
             end
         end
 
@@ -733,11 +772,17 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
     ---@param plc_state plc_state PLC state
     ---@param setpoints setpoints setpoint control table
     function public.handle_packet(packet, plc_state, setpoints)
-        if packet.scada_frame.local_port() == local_port then
+        -- print a log message to the terminal as long as the UI isn't running
+        local function println_ts(message) if not plc_state.fp_ok then util.println_ts(message) end end
+
+        local l_port = packet.scada_frame.local_port()
+
+        -- handle packets now that we have prints setup
+        if l_port == local_port then
             -- check sequence number
             if self.r_seq_num == nil then
                 self.r_seq_num = packet.scada_frame.seq_num()
-            elseif self.linked and self.r_seq_num >= packet.scada_frame.seq_num() then
+            elseif self.linked and ((self.r_seq_num + 1) ~= packet.scada_frame.seq_num()) then
                 log.warning("sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. packet.scada_frame.seq_num())
                 return
             else
@@ -881,7 +926,7 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
                             log.debug("RPLC set automatic burn rate packet length mismatch or non-numeric burn rate")
                         end
                     else
-                        log.warning("received unknown RPLC packet type " .. packet.type)
+                        log.debug("received unknown RPLC packet type " .. packet.type)
                     end
                 else
                     log.debug("discarding RPLC packet before linked")
@@ -903,7 +948,7 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
                                 log.debug("re-sent initial status data")
                             elseif est_ack == ESTABLISH_ACK.DENY then
                                 println_ts("received unsolicited link denial, unlinking")
-                                log.info("unsolicited establish request denied")
+                                log.warning("unsolicited establish request denied")
                             elseif est_ack == ESTABLISH_ACK.COLLISION then
                                 println_ts("received unsolicited link collision, unlinking")
                                 log.warning("unsolicited establish request collision")
@@ -912,13 +957,16 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
                                 log.warning("unsolicited establish request version mismatch")
                             else
                                 println_ts("invalid unsolicited link response")
-                                log.error("unsolicited unknown establish request response")
+                                log.debug("unsolicited unknown establish request response")
                             end
 
                             self.linked = est_ack == ESTABLISH_ACK.ALLOW
 
                             -- clear this since this is for something that was unsolicited
                             self.last_est_ack = ESTABLISH_ACK.ALLOW
+
+                            -- report link state
+                            databus.tx_link_state(est_ack + 1)
                         else
                             log.debug("SCADA_MGMT establish packet length mismatch")
                         end
@@ -945,7 +993,7 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
                         println_ts("server connection closed by remote host")
                         log.warning("server connection closed by remote host")
                     else
-                        log.warning("received unsupported SCADA_MGMT packet type " .. packet.type)
+                        log.debug("received unsupported SCADA_MGMT packet type " .. packet.type)
                     end
                 elseif packet.type == SCADA_MGMT_TYPE.ESTABLISH then
                     -- link request confirmation
@@ -982,6 +1030,9 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
 
                         self.linked = est_ack == ESTABLISH_ACK.ALLOW
                         self.last_est_ack = est_ack
+
+                        -- report link state
+                        databus.tx_link_state(est_ack + 1)
                     else
                         log.debug("SCADA_MGMT establish packet length mismatch")
                     end
@@ -992,6 +1043,8 @@ function plc.comms(id, version, modem, local_port, server_port, range, reactor,
                 -- should be unreachable assuming packet is from parse_packet()
                 log.error("illegal packet type " .. protocol, true)
             end
+        else
+            log.debug("received packet on unconfigured channel " .. l_port, true)
         end
     end
 

reactor-plc/renderer.lua

@@ -0,0 +1,78 @@
+--
+-- Graphics Rendering Control
+--
+
+local panel_view = require("reactor-plc.panel.front_panel")
+local style      = require("reactor-plc.panel.style")
+
+local flasher    = require("graphics.flasher")
+
+local DisplayBox = require("graphics.elements.displaybox")
+
+local renderer = {}
+
+local ui = {
+    display = nil
+}
+
+-- start the UI
+function renderer.start_ui()
+    if ui.display == nil then
+        -- reset terminal
+        term.setTextColor(colors.white)
+        term.setBackgroundColor(colors.black)
+        term.clear()
+        term.setCursorPos(1, 1)
+
+        -- set overridden colors
+        for i = 1, #style.colors do
+            term.setPaletteColor(style.colors[i].c, style.colors[i].hex)
+        end
+
+        -- init front panel view
+        ui.display = DisplayBox{window=term.current(),fg_bg=style.root}
+        panel_view(ui.display)
+
+        -- start flasher callback task
+        flasher.run()
+    end
+end
+
+-- close out the UI
+function renderer.close_ui()
+    if ui.display ~= nil then
+        -- stop blinking indicators
+        flasher.clear()
+
+        -- delete element tree
+        ui.display.delete()
+        ui.display = nil
+
+        -- restore colors
+        for i = 1, #style.colors do
+            local r, g, b = term.nativePaletteColor(style.colors[i].c)
+            term.setPaletteColor(style.colors[i].c, r, g, b)
+        end
+
+        -- reset terminal
+        term.setTextColor(colors.white)
+        term.setBackgroundColor(colors.black)
+        term.clear()
+        term.setCursorPos(1, 1)
+    end
+end
+
+-- is the UI ready?
+---@nodiscard
+---@return boolean ready
+function renderer.ui_ready() return ui.display ~= nil end
+
+-- handle a mouse event
+---@param event mouse_interaction|nil
+function renderer.handle_mouse(event)
+    if ui.display ~= nil and event ~= nil then
+        ui.display.handle_mouse(event)
+    end
+end
+
+return renderer

reactor-plc/startup.lua

@@ -4,21 +4,23 @@
 
 require("/initenv").init_env()
 
-local crash   = require("scada-common.crash")
+local comms    = require("scada-common.comms")
-local log     = require("scada-common.log")
+local crash    = require("scada-common.crash")
-local mqueue  = require("scada-common.mqueue")
+local log      = require("scada-common.log")
-local ppm     = require("scada-common.ppm")
+local mqueue   = require("scada-common.mqueue")
-local util    = require("scada-common.util")
+local ppm      = require("scada-common.ppm")
+local rsio     = require("scada-common.rsio")
+local util     = require("scada-common.util")
 
-local config  = require("reactor-plc.config")
+local config   = require("reactor-plc.config")
-local plc     = require("reactor-plc.plc")
+local databus  = require("reactor-plc.databus")
-local threads = require("reactor-plc.threads")
+local plc      = require("reactor-plc.plc")
+local renderer = require("reactor-plc.renderer")
+local threads  = require("reactor-plc.threads")
 
-local R_PLC_VERSION = "v1.0.0"
+local R_PLC_VERSION = "v1.3.1"
 
-local print = util.print
 local println = util.println
-local print_ts = util.print_ts
 local println_ts = util.println_ts
 
 ----------------------------------------
@@ -39,11 +41,20 @@ cfv.assert_type_int(config.LOG_MODE)
 
 assert(cfv.valid(), "bad config file: missing/invalid fields")
 
+-- check emergency coolant configuration
+if type(config.EMERGENCY_COOL) == "table" then
+    if not rsio.is_valid_side(config.EMERGENCY_COOL.side) then
+        assert(false, "bad config file: emergency coolant side unrecognized")
+    elseif config.EMERGENCY_COOL.color ~= nil and not rsio.is_color(config.EMERGENCY_COOL.color) then
+        assert(false, "bad config file: emergency coolant invalid redstone channel color provided")
+    end
+end
+
 ----------------------------------------
 -- log init
 ----------------------------------------
 
-log.init(config.LOG_PATH, config.LOG_MODE)
+log.init(config.LOG_PATH, config.LOG_MODE, config.LOG_DEBUG == true)
 
 log.info("========================================")
 log.info("BOOTING reactor-plc.startup " .. R_PLC_VERSION)
@@ -61,6 +72,10 @@ local function main()
     -- startup
     ----------------------------------------
 
+    -- record firmware versions and ID
+    databus.tx_versions(R_PLC_VERSION, comms.version)
+    databus.tx_id(config.REACTOR_ID)
+
     -- mount connected devices
     ppm.mount_all()
 
@@ -74,6 +89,7 @@ local function main()
         ---@class plc_state
         plc_state = {
             init_ok = true,
+            fp_ok = false,
             shutdown = false,
             degraded = false,
             reactor_formed = true,
@@ -145,17 +161,34 @@ local function main()
         plc_state.no_modem = true
     end
 
+    -- print a log message to the terminal as long as the UI isn't running
+    local function _println_no_fp(message) if not plc_state.fp_ok then println(message) end end
+
     -- PLC init<br>
     --- EVENT_CONSUMER: this function consumes events
     local function init()
-        if plc_state.init_ok then
+        -- just booting up, no fission allowed (neutrons stay put thanks)
-            -- just booting up, no fission allowed (neutrons stay put thanks)
+        if (not plc_state.no_reactor) and plc_state.reactor_formed and smem_dev.reactor.getStatus() then
-            if plc_state.reactor_formed and smem_dev.reactor.getStatus() then
+            smem_dev.reactor.scram()
-                smem_dev.reactor.scram()
+        end
-            end
 
+        -- front panel time!
+        if not renderer.ui_ready() then
+            local message
+            plc_state.fp_ok, message = pcall(renderer.start_ui)
+
+            if not plc_state.fp_ok then
+                renderer.close_ui()
+                println_ts(util.c("UI error: ", message))
+                println("init> running without front panel")
+                log.error(util.c("GUI crashed with error ", message))
+                log.info("init> running in headless mode without front panel")
+            end
+        end
+
+        if plc_state.init_ok then
             -- init reactor protection system
-            smem_sys.rps = plc.rps_init(smem_dev.reactor, plc_state.reactor_formed)
+            smem_sys.rps = plc.rps_init(smem_dev.reactor, plc_state.reactor_formed, config.EMERGENCY_COOL)
             log.debug("init> rps init")
 
             if __shared_memory.networked then
@@ -168,18 +201,26 @@ local function main()
                                                 config.TRUSTED_RANGE, smem_dev.reactor, smem_sys.rps, smem_sys.conn_watchdog)
                 log.debug("init> comms init")
             else
-                println("init> starting in offline mode")
+                _println_no_fp("init> starting in offline mode")
                 log.info("init> running without networking")
             end
 
+            -- notify user of emergency coolant configuration status
+            if config.EMERGENCY_COOL ~= nil then
+                println("init> emergency coolant control ready")
+                log.info("init> running with emergency coolant control available")
+            end
+
             util.push_event("clock_start")
 
-            println("init> completed")
+            _println_no_fp("init> completed")
             log.info("init> startup completed")
         else
-            println("init> system in degraded state, awaiting devices...")
+            _println_no_fp("init> system in degraded state, awaiting devices...")
             log.warning("init> started in a degraded state, awaiting peripheral connections...")
         end
+
+        databus.tx_hw_status(plc_state)
     end
 
     ----------------------------------------
@@ -217,8 +258,15 @@ local function main()
         parallel.waitForAll(main_thread.p_exec, rps_thread.p_exec)
     end
 
+    renderer.close_ui()
+
     println_ts("exited")
     log.info("exited")
 end
 
-if not xpcall(main, crash.handler) then crash.exit() end
+if not xpcall(main, crash.handler) then
+    pcall(renderer.close_ui)
+    crash.exit()
+else
+    log.close()
+end

reactor-plc/threads.lua

@@ -1,15 +1,16 @@
-local log    = require("scada-common.log")
+local log          = require("scada-common.log")
-local mqueue = require("scada-common.mqueue")
+local mqueue       = require("scada-common.mqueue")
-local ppm    = require("scada-common.ppm")
+local ppm          = require("scada-common.ppm")
-local util   = require("scada-common.util")
+local tcallbackdsp = require("scada-common.tcallbackdsp")
+local util         = require("scada-common.util")
+
+local databus      = require("reactor-plc.databus")
+local renderer     = require("reactor-plc.renderer")
+
+local core         = require("graphics.core")
 
 local threads = {}
 
-local print = util.print
-local println = util.println
-local print_ts = util.print_ts
-local println_ts = util.println_ts
-
 local MAIN_CLOCK    = 0.5 -- (2Hz,   10 ticks)
 local RPS_SLEEP     = 250 -- (250ms, 5 ticks)
 local COMMS_SLEEP   = 150 -- (150ms, 3 ticks)
@@ -32,11 +33,15 @@ local MQ__COMM_CMD = {
 ---@param smem plc_shared_memory
 ---@param init function
 function threads.thread__main(smem, init)
+    -- print a log message to the terminal as long as the UI isn't running
+    local function println_ts(message) if not smem.plc_state.fp_ok then util.println_ts(message) end end
+
     ---@class parallel_thread
     local public = {}
 
     -- execute thread
     function public.exec()
+        databus.tx_rt_status("main", true)
         log.debug("main thread init, clock inactive")
 
         -- send status updates at 2Hz (every 10 server ticks) (every loop tick)
@@ -61,6 +66,9 @@ function threads.thread__main(smem, init)
 
             -- handle event
             if event == "timer" and loop_clock.is_clock(param1) then
+                -- blink heartbeat indicator
+                databus.heartbeat()
+
                 -- core clock tick
                 if networked then
                     -- start next clock timer
@@ -133,6 +141,9 @@ function threads.thread__main(smem, init)
                     -- reactor no longer formed
                     plc_state.reactor_formed = false
                 end
+
+                -- update indicators
+                databus.tx_hw_status(plc_state)
             elseif event == "modem_message" and networked and plc_state.init_ok and not plc_state.no_modem then
                 -- got a packet
                 local packet = plc_comms.parse_packet(param1, param2, param3, param4, param5)
@@ -144,6 +155,9 @@ function threads.thread__main(smem, init)
                 -- haven't heard from server recently? shutdown reactor
                 plc_comms.unlink()
                 smem.q.mq_rps.push_command(MQ__RPS_CMD.TRIP_TIMEOUT)
+            elseif event == "timer" then
+                -- notify timer callback dispatcher if no other timer case claimed this event
+                tcallbackdsp.handle(param1)
             elseif event == "peripheral_detach" then
                 -- peripheral disconnect
                 local type, device = ppm.handle_unmount(param1)
@@ -174,6 +188,9 @@ function threads.thread__main(smem, init)
                         end
                     end
                 end
+
+                -- update indicators
+                databus.tx_hw_status(plc_state)
             elseif event == "peripheral" then
                 -- peripheral connect
                 local type, device = ppm.mount(param1)
@@ -237,6 +254,12 @@ function threads.thread__main(smem, init)
                     plc_state.init_ok = true
                     init()
                 end
+
+                -- update indicators
+                databus.tx_hw_status(plc_state)
+            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll" then
+                -- handle a mouse event
+                renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))
             elseif event == "clock_start" then
                 -- start loop clock
                 loop_clock.start()
@@ -263,6 +286,8 @@ function threads.thread__main(smem, init)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("main", false)
+
             -- if status is true, then we are probably exiting, so this won't matter
             -- if not, we need to restart the clock
             -- this thread cannot be slept because it will miss events (namely "terminate" otherwise)
@@ -280,11 +305,15 @@ end
 ---@nodiscard
 ---@param smem plc_shared_memory
 function threads.thread__rps(smem)
+    -- print a log message to the terminal as long as the UI isn't running
+    local function println_ts(message) if not smem.plc_state.fp_ok then util.println_ts(message) end end
+
     ---@class parallel_thread
     local public = {}
 
     -- execute thread
     function public.exec()
+        databus.tx_rt_status("rps", true)
         log.debug("rps thread start")
 
         -- load in from shared memory
@@ -314,15 +343,20 @@ function threads.thread__rps(smem)
                         rps.trip_timeout()
                     end
                 else
-                    -- would do elseif not networked but there is no reason to do that extra operation
                     was_linked = true
                 end
 
-                -- if we tried to SCRAM but failed, keep trying
+                if (not plc_state.no_reactor) and rps.is_formed() then
-                -- in that case, SCRAM won't be called until it reconnects (this is the expected use of this check)
+                    -- check reactor status
 ---@diagnostic disable-next-line: need-check-nil
-                if (not plc_state.no_reactor) and rps.is_formed() and rps.is_tripped() and reactor.getStatus() then
+                    local reactor_status = reactor.getStatus()
-                    rps.scram()
+                    databus.tx_reactor_state(reactor_status)
+
+                    -- if we tried to SCRAM but failed, keep trying
+                    -- in that case, SCRAM won't be called until it reconnects (this is the expected use of this check)
+                    if rps.is_tripped() and reactor_status then
+                        rps.scram()
+                    end
                 end
 
                 -- if we are in standalone mode, continuously reset RPS
@@ -406,6 +440,8 @@ function threads.thread__rps(smem)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("rps", false)
+
             if not plc_state.shutdown then
                 if plc_state.init_ok then smem.plc_sys.rps.scram() end
                 log.info("rps thread restarting in 5 seconds...")
@@ -426,6 +462,7 @@ function threads.thread__comms_tx(smem)
 
     -- execute thread
     function public.exec()
+        databus.tx_rt_status("comms_tx", true)
         log.debug("comms tx thread start")
 
         -- load in from shared memory
@@ -483,6 +520,8 @@ function threads.thread__comms_tx(smem)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("comms_tx", false)
+
             if not plc_state.shutdown then
                 log.info("comms tx thread restarting in 5 seconds...")
                 util.psleep(5)
@@ -502,6 +541,7 @@ function threads.thread__comms_rx(smem)
 
     -- execute thread
     function public.exec()
+        databus.tx_rt_status("comms_rx", true)
         log.debug("comms rx thread start")
 
         -- load in from shared memory
@@ -559,6 +599,8 @@ function threads.thread__comms_rx(smem)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("comms_rx", false)
+
             if not plc_state.shutdown then
                 log.info("comms rx thread restarting in 5 seconds...")
                 util.psleep(5)
@@ -578,6 +620,7 @@ function threads.thread__setpoint_control(smem)
 
     -- execute thread
     function public.exec()
+        databus.tx_rt_status("spctl", true)
         log.debug("setpoint control thread start")
 
         -- load in from shared memory
@@ -637,7 +680,7 @@ function threads.thread__setpoint_control(smem)
                             -- we yielded, check enable again
                             if setpoints.burn_rate_en and (type(current_burn_rate) == "number") and (current_burn_rate ~= setpoints.burn_rate) then
                                 -- calculate new burn rate
-                                local new_burn_rate = current_burn_rate
+                                local new_burn_rate ---@type number
 
                                 if setpoints.burn_rate > current_burn_rate then
                                     -- need to ramp up
@@ -692,6 +735,8 @@ function threads.thread__setpoint_control(smem)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("spctl", false)
+
             if not plc_state.shutdown then
                 log.info("setpoint control thread restarting in 5 seconds...")
                 util.psleep(5)

rtu/config.lua

@@ -17,6 +17,8 @@ config.LOG_PATH = "/log.txt"
 --  0 = APPEND (adds to existing file on start)
 --  1 = NEW (replaces existing file on start)
 config.LOG_MODE = 0
+-- true to log verbose debug messages
+config.LOG_DEBUG = false
 
 -- RTU peripheral devices (named: side/network device name)
 config.RTU_DEVICES = {

rtu/databus.lua

@@ -0,0 +1,74 @@
+--
+-- Data Bus - Central Communication Linking for RTU Front Panel
+--
+
+local psil = require("scada-common.psil")
+local util = require("scada-common.util")
+
+local databus = {}
+
+-- databus PSIL
+databus.ps = psil.create()
+
+---@enum RTU_UNIT_HW_STATE
+local RTU_UNIT_HW_STATE = {
+    OFFLINE = 1,
+    FAULTED = 2,
+    UNFORMED = 3,
+    OK = 4
+}
+
+databus.RTU_UNIT_HW_STATE = RTU_UNIT_HW_STATE
+
+-- call to toggle heartbeat signal
+function databus.heartbeat() databus.ps.toggle("heartbeat") end
+
+-- transmit firmware versions across the bus
+---@param rtu_v string RTU version
+---@param comms_v string comms version
+function databus.tx_versions(rtu_v, comms_v)
+    databus.ps.publish("version", rtu_v)
+    databus.ps.publish("comms_version", comms_v)
+end
+
+-- transmit hardware status for modem connection state
+---@param has_modem boolean
+function databus.tx_hw_modem(has_modem)
+    databus.ps.publish("has_modem", has_modem)
+end
+
+-- transmit unit hardware type across the bus
+---@param uid integer unit ID
+---@param type RTU_UNIT_TYPE
+function databus.tx_unit_hw_type(uid, type)
+    databus.ps.publish("unit_type_" .. uid, type)
+end
+
+-- transmit unit hardware status across the bus
+---@param uid integer unit ID
+---@param status RTU_UNIT_HW_STATE
+function databus.tx_unit_hw_status(uid, status)
+    databus.ps.publish("unit_hw_" .. uid, status)
+end
+
+-- transmit thread (routine) statuses
+---@param thread string thread name
+---@param ok boolean thread state
+function databus.tx_rt_status(thread, ok)
+    databus.ps.publish(util.c("routine__", thread), ok)
+end
+
+-- transmit supervisor link state across the bus
+---@param state integer
+function databus.tx_link_state(state)
+    databus.ps.publish("link_state", state)
+end
+
+-- link a function to receive data from the bus
+---@param field string field name
+---@param func function function to link
+function databus.rx_field(field, func)
+    databus.ps.subscribe(field, func)
+end
+
+return databus

rtu/dev/boilerv_rtu.lua

@@ -5,9 +5,13 @@ local boilerv_rtu = {}
 -- create new boiler (mek 10.1+) device
 ---@nodiscard
 ---@param boiler table
+---@return rtu_device interface, boolean faulted
 function boilerv_rtu.new(boiler)
     local unit = rtu.init_unit()
 
+    -- disable auto fault clearing
+    boiler.__p_disable_afc()
+
     -- discrete inputs --
     unit.connect_di(boiler.isFormed)
 
@@ -50,7 +54,12 @@ function boilerv_rtu.new(boiler)
     -- holding registers --
     -- none
 
-    return unit.interface()
+    -- check if any calls faulted
+    local faulted = boiler.__p_is_faulted()
+    boiler.__p_clear_fault()
+    boiler.__p_enable_afc()
+
+    return unit.interface(), faulted
 end
 
 return boilerv_rtu

rtu/dev/envd_rtu.lua

@@ -5,9 +5,13 @@ local envd_rtu = {}
 -- create new environment detector device
 ---@nodiscard
 ---@param envd table
+---@return rtu_device interface, boolean faulted
 function envd_rtu.new(envd)
     local unit = rtu.init_unit()
 
+    -- disable auto fault clearing
+    envd.__p_disable_afc()
+
     -- discrete inputs --
     -- none
 
@@ -21,7 +25,12 @@ function envd_rtu.new(envd)
     -- holding registers --
     -- none
 
-    return unit.interface()
+    -- check if any calls faulted
+    local faulted = envd.__p_is_faulted()
+    envd.__p_clear_fault()
+    envd.__p_enable_afc()
+
+    return unit.interface(), faulted
 end
 
 return envd_rtu

rtu/dev/imatrix_rtu.lua

@@ -5,9 +5,13 @@ local imatrix_rtu = {}
 -- create new induction matrix (mek 10.1+) device
 ---@nodiscard
 ---@param imatrix table
+---@return rtu_device interface, boolean faulted
 function imatrix_rtu.new(imatrix)
     local unit = rtu.init_unit()
 
+    -- disable auto fault clearing
+    imatrix.__p_disable_afc()
+
     -- discrete inputs --
     unit.connect_di(imatrix.isFormed)
 
@@ -37,7 +41,12 @@ function imatrix_rtu.new(imatrix)
     -- holding registers --
     -- none
 
-    return unit.interface()
+    -- check if any calls faulted
+    local faulted = imatrix.__p_is_faulted()
+    imatrix.__p_clear_fault()
+    imatrix.__p_enable_afc()
+
+    return unit.interface(), faulted
 end
 
 return imatrix_rtu

rtu/dev/redstone_rtu.lua

@@ -11,6 +11,7 @@ local digital_write = rsio.digital_write
 
 -- create new redstone device
 ---@nodiscard
+---@return rtu_rs_device interface, boolean faulted
 function redstone_rtu.new()
     local unit = rtu.init_unit()
 
@@ -33,7 +34,7 @@ function redstone_rtu.new()
     ---@param side string
     ---@param color integer
     function public.link_di(side, color)
-        local f_read = nil
+        local f_read    ---@type function
 
         if color then
             f_read = function ()
@@ -52,8 +53,8 @@ function redstone_rtu.new()
     ---@param side string
     ---@param color integer
     function public.link_do(side, color)
-        local f_read = nil
+        local f_read    ---@type function
-        local f_write = nil
+        local f_write   ---@type function
 
         if color then
             f_read = function ()
@@ -111,7 +112,7 @@ function redstone_rtu.new()
         )
     end
 
-    return public
+    return public, false
 end
 
 return redstone_rtu

rtu/dev/sna_rtu.lua

@@ -5,9 +5,13 @@ local sna_rtu = {}
 -- create new solar neutron activator (SNA) device
 ---@nodiscard
 ---@param sna table
+---@return rtu_device interface, boolean faulted
 function sna_rtu.new(sna)
     local unit = rtu.init_unit()
 
+    -- disable auto fault clearing
+    sna.__p_disable_afc()
+
     -- discrete inputs --
     -- none
 
@@ -32,7 +36,12 @@ function sna_rtu.new(sna)
     -- holding registers --
     -- none
 
-    return unit.interface()
+    -- check if any calls faulted
+    local faulted = sna.__p_is_faulted()
+    sna.__p_clear_fault()
+    sna.__p_enable_afc()
+
+    return unit.interface(), faulted
 end
 
 return sna_rtu

rtu/dev/sps_rtu.lua

@@ -5,9 +5,13 @@ local sps_rtu = {}
 -- create new super-critical phase shifter (SPS) device
 ---@nodiscard
 ---@param sps table
+---@return rtu_device interface, boolean faulted
 function sps_rtu.new(sps)
     local unit = rtu.init_unit()
 
+    -- disable auto fault clearing
+    sps.__p_disable_afc()
+
     -- discrete inputs --
     unit.connect_di(sps.isFormed)
 
@@ -42,7 +46,12 @@ function sps_rtu.new(sps)
     -- holding registers --
     -- none
 
-    return unit.interface()
+    -- check if any calls faulted
+    local faulted = sps.__p_is_faulted()
+    sps.__p_clear_fault()
+    sps.__p_enable_afc()
+
+    return unit.interface(), faulted
 end
 
 return sps_rtu

rtu/dev/turbinev_rtu.lua

@@ -5,9 +5,13 @@ local turbinev_rtu = {}
 -- create new turbine (mek 10.1+) device
 ---@nodiscard
 ---@param turbine table
+---@return rtu_device interface, boolean faulted
 function turbinev_rtu.new(turbine)
     local unit = rtu.init_unit()
 
+    -- disable auto fault clearing
+    turbine.__p_disable_afc()
+
     -- discrete inputs --
     unit.connect_di(turbine.isFormed)
 
@@ -49,7 +53,12 @@ function turbinev_rtu.new(turbine)
     -- holding registers --
     unit.connect_holding_reg(turbine.getDumpingMode, turbine.setDumpingMode)
 
-    return unit.interface()
+    -- check if any calls faulted
+    local faulted = turbine.__p_is_faulted()
+    turbine.__p_clear_fault()
+    turbine.__p_enable_afc()
+
+    return unit.interface(), faulted
 end
 
 return turbinev_rtu

rtu/modbus.lua

@@ -347,11 +347,9 @@ function modbus.new(rtu_dev, use_parallel_read)
             response = { MODBUS_EXCODE.NEG_ACKNOWLEDGE }
         end
 
-        -- default is to echo back
+        -- default is to echo back<br>
-        local func_code = packet.func_code
+        -- but here we echo back with error flag, on success the "error" will be acknowledgement
-
+        local func_code = bit.bor(packet.func_code, MODBUS_FCODE.ERROR_FLAG)
-        -- echo back with error flag, on success the "error" will be acknowledgement
-        func_code = bit.bor(packet.func_code, MODBUS_FCODE.ERROR_FLAG)
 
         -- create reply
         local reply = comms.modbus_packet()
@@ -365,8 +363,8 @@ function modbus.new(rtu_dev, use_parallel_read)
     ---@param packet modbus_frame
     ---@return boolean return_code, modbus_packet reply
     function public.handle_packet(packet)
-        local return_code = true
+        local return_code   ---@type boolean
-        local response = nil
+        local response      ---@type table|MODBUS_EXCODE
 
         if packet.length >= 2 then
             -- handle  by function code

rtu/panel/front_panel.lua

@@ -0,0 +1,121 @@
+--
+-- Main SCADA Coordinator GUI
+--
+
+local util       = require("scada-common.util")
+
+local databus    = require("rtu.databus")
+
+local style      = require("rtu.panel.style")
+
+local core       = require("graphics.core")
+
+local Div        = require("graphics.elements.div")
+local TextBox    = require("graphics.elements.textbox")
+
+local LED        = require("graphics.elements.indicators.led")
+local RGBLED     = require("graphics.elements.indicators.ledrgb")
+
+local TEXT_ALIGN = core.TEXT_ALIGN
+
+local cpair = core.cpair
+
+local UNIT_TYPE_LABELS = {
+    "UNKNOWN",
+    "REDSTONE",
+    "BOILER",
+    "TURBINE",
+    "IND MATRIX",
+    "SPS",
+    "SNA",
+    "ENV DETECTOR"
+}
+
+
+-- create new main view
+---@param panel graphics_element main displaybox
+---@param units table unit list
+local function init(panel, units)
+    TextBox{parent=panel,y=1,text="RTU GATEWAY",alignment=TEXT_ALIGN.CENTER,height=1,fg_bg=style.header}
+
+    --
+    -- system indicators
+    --
+
+    local system = Div{parent=panel,width=14,height=18,x=2,y=3}
+
+    local on = LED{parent=system,label="POWER",colors=cpair(colors.green,colors.red)}
+    local heartbeat = LED{parent=system,label="HEARTBEAT",colors=cpair(colors.green,colors.green_off)}
+    on.update(true)
+    system.line_break()
+
+    heartbeat.register(databus.ps, "heartbeat", heartbeat.update)
+
+    local modem = LED{parent=system,label="MODEM",colors=cpair(colors.green,colors.green_off)}
+    local network = RGBLED{parent=system,label="NETWORK",colors={colors.green,colors.red,colors.orange,colors.yellow,colors.gray}}
+    network.update(5)
+    system.line_break()
+
+    modem.register(databus.ps, "has_modem", modem.update)
+    network.register(databus.ps, "link_state", network.update)
+
+    local rt_main = LED{parent=system,label="RT MAIN",colors=cpair(colors.green,colors.green_off)}
+    local rt_comm = LED{parent=system,label="RT COMMS",colors=cpair(colors.green,colors.green_off)}
+    system.line_break()
+
+    rt_main.register(databus.ps, "routine__main", rt_main.update)
+    rt_comm.register(databus.ps, "routine__comms", rt_comm.update)
+
+    --
+    -- about label
+    --
+
+    local about   = Div{parent=panel,width=15,height=3,x=1,y=18,fg_bg=cpair(colors.lightGray,colors.ivory)}
+    local fw_v    = TextBox{parent=about,x=1,y=1,text="FW: v00.00.00",alignment=TEXT_ALIGN.LEFT,height=1}
+    local comms_v = TextBox{parent=about,x=1,y=2,text="NT: v00.00.00",alignment=TEXT_ALIGN.LEFT,height=1}
+
+    fw_v.register(databus.ps, "version", function (version) fw_v.set_value(util.c("FW: ", version)) end)
+    comms_v.register(databus.ps, "comms_version", function (version) comms_v.set_value(util.c("NT: v", version)) end)
+
+    --
+    -- unit status list
+    --
+
+    local threads = Div{parent=panel,width=8,height=18,x=17,y=3}
+
+    -- display up to 16 units
+    local list_length = math.min(#units, 16)
+
+    -- show routine statuses
+    for i = 1, list_length do
+        TextBox{parent=threads,x=1,y=i,text=util.sprintf("%02d",i),height=1}
+        local rt_unit = LED{parent=threads,x=4,y=i,label="RT",colors=cpair(colors.green,colors.green_off)}
+        rt_unit.register(databus.ps, "routine__unit_" .. i, rt_unit.update)
+    end
+
+    local unit_hw_statuses = Div{parent=panel,height=18,x=25,y=3}
+
+    -- show hardware statuses
+    for i = 1, list_length do
+        local unit = units[i]   ---@type rtu_unit_registry_entry
+
+        -- hardware status
+        local unit_hw = RGBLED{parent=unit_hw_statuses,y=i,label="",colors={colors.red,colors.orange,colors.yellow,colors.green}}
+
+        unit_hw.register(databus.ps, "unit_hw_" .. i, unit_hw.update)
+
+        -- unit name identifier (type + index)
+        local name = util.c(UNIT_TYPE_LABELS[unit.type + 1], " ", unit.index)
+        local name_box = TextBox{parent=unit_hw_statuses,y=i,x=3,text=name,height=1}
+
+        name_box.register(databus.ps, "unit_type_" .. i, function (t)
+            name_box.set_value(util.c(UNIT_TYPE_LABELS[t + 1], " ", unit.index))
+        end)
+
+        -- assignment (unit # or facility)
+        local for_unit = util.trinary(unit.reactor == 0, "\x1a FACIL ", "\x1a UNIT " .. unit.reactor)
+        TextBox{parent=unit_hw_statuses,y=i,x=19,text=for_unit,height=1,fg_bg=cpair(colors.lightGray,colors.ivory)}
+    end
+end
+
+return init

rtu/panel/style.lua

@@ -0,0 +1,41 @@
+--
+-- Graphics Style Options
+--
+
+local core = require("graphics.core")
+
+local style = {}
+
+local cpair = core.cpair
+
+-- GLOBAL --
+
+-- remap global colors
+colors.ivory = colors.pink
+colors.red_off = colors.brown
+colors.yellow_off = colors.magenta
+colors.green_off = colors.lime
+
+style.root = cpair(colors.black, colors.ivory)
+style.header = cpair(colors.black, colors.lightGray)
+
+style.colors = {
+    { c = colors.red,       hex = 0xdf4949 },   -- RED ON
+    { c = colors.orange,    hex = 0xffb659 },
+    { c = colors.yellow,    hex = 0xf9fb53 },   -- YELLOW ON
+    { c = colors.lime,      hex = 0x16665a },   -- GREEN OFF
+    { c = colors.green,     hex = 0x6be551 },   -- GREEN ON
+    { c = colors.cyan,      hex = 0x34bac8 },
+    { c = colors.lightBlue, hex = 0x6cc0f2 },
+    { c = colors.blue,      hex = 0x0096ff },
+    { c = colors.purple,    hex = 0xb156ee },
+    { c = colors.pink,      hex = 0xdcd9ca },   -- IVORY
+    { c = colors.magenta,   hex = 0x85862c },   -- YELLOW OFF
+    -- { c = colors.white,     hex = 0xdcd9ca },
+    { c = colors.lightGray, hex = 0xb1b8b3 },
+    { c = colors.gray,      hex = 0x575757 },
+    -- { c = colors.black,     hex = 0x191919 },
+    { c = colors.brown,     hex = 0x672223 }    -- RED OFF
+}
+
+return style

rtu/renderer.lua

@@ -0,0 +1,79 @@
+--
+-- Graphics Rendering Control
+--
+
+local panel_view = require("rtu.panel.front_panel")
+local style      = require("rtu.panel.style")
+
+local flasher    = require("graphics.flasher")
+
+local DisplayBox = require("graphics.elements.displaybox")
+
+local renderer = {}
+
+local ui = {
+    display = nil
+}
+
+-- start the UI
+---@param units table RTU units
+function renderer.start_ui(units)
+    if ui.display == nil then
+        -- reset terminal
+        term.setTextColor(colors.white)
+        term.setBackgroundColor(colors.black)
+        term.clear()
+        term.setCursorPos(1, 1)
+
+        -- set overridden colors
+        for i = 1, #style.colors do
+            term.setPaletteColor(style.colors[i].c, style.colors[i].hex)
+        end
+
+        -- start flasher callback task
+        flasher.run()
+
+        -- init front panel view
+        ui.display = DisplayBox{window=term.current(),fg_bg=style.root}
+        panel_view(ui.display, units)
+    end
+end
+
+-- close out the UI
+function renderer.close_ui()
+    if ui.display ~= nil then
+        -- stop blinking indicators
+        flasher.clear()
+
+        -- delete element tree
+        ui.display.delete()
+        ui.display = nil
+
+        -- restore colors
+        for i = 1, #style.colors do
+            local r, g, b = term.nativePaletteColor(style.colors[i].c)
+            term.setPaletteColor(style.colors[i].c, r, g, b)
+        end
+
+        -- reset terminal
+        term.setTextColor(colors.white)
+        term.setBackgroundColor(colors.black)
+        term.clear()
+        term.setCursorPos(1, 1)
+    end
+end
+
+-- is the UI ready?
+---@nodiscard
+---@return boolean ready
+function renderer.ui_ready() return ui.display ~= nil end
+
+-- handle a mouse event
+---@param event mouse_interaction|nil
+function renderer.handle_mouse(event)
+    if ui.display ~= nil and event ~= nil then
+        ui.display.handle_mouse(event)
+    end
+end
+
+return renderer

rtu/rtu.lua

@@ -1,10 +1,11 @@
-local comms  = require("scada-common.comms")
+local comms   = require("scada-common.comms")
-local ppm    = require("scada-common.ppm")
+local ppm     = require("scada-common.ppm")
-local log    = require("scada-common.log")
+local log     = require("scada-common.log")
-local types  = require("scada-common.types")
+local types   = require("scada-common.types")
-local util   = require("scada-common.util")
+local util    = require("scada-common.util")
 
-local modbus = require("rtu.modbus")
+local databus = require("rtu.databus")
+local modbus  = require("rtu.modbus")
 
 local rtu = {}
 
@@ -14,11 +15,6 @@ local ESTABLISH_ACK = comms.ESTABLISH_ACK
 local SCADA_MGMT_TYPE = comms.SCADA_MGMT_TYPE
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
 
-local print = util.print
-local println = util.println
-local print_ts = util.print_ts
-local println_ts = util.println_ts
-
 -- create a new RTU unit
 ---@nodiscard
 function rtu.init_unit()
@@ -316,7 +312,7 @@ function rtu.comms(version, modem, local_port, server_port, range, conn_watchdog
                     pkt = mgmt_pkt.get()
                 end
             else
-                log.error("illegal packet type " .. s_pkt.protocol(), true)
+                log.debug("illegal packet type " .. s_pkt.protocol(), true)
             end
         end
 
@@ -328,11 +324,14 @@ function rtu.comms(version, modem, local_port, server_port, range, conn_watchdog
     ---@param units table RTU units
     ---@param rtu_state rtu_state
     function public.handle_packet(packet, units, rtu_state)
+        -- print a log message to the terminal as long as the UI isn't running
+        local function println_ts(message) if not rtu_state.fp_ok then util.println_ts(message) end end
+
         if packet.scada_frame.local_port() == local_port then
             -- check sequence number
             if self.r_seq_num == nil then
                 self.r_seq_num = packet.scada_frame.seq_num()
-            elseif rtu_state.linked and self.r_seq_num >= packet.scada_frame.seq_num() then
+            elseif rtu_state.linked and ((self.r_seq_num + 1) ~= packet.scada_frame.seq_num()) then
                 log.warning("sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. packet.scada_frame.seq_num())
                 return
             else
@@ -347,8 +346,8 @@ function rtu.comms(version, modem, local_port, server_port, range, conn_watchdog
             if protocol == PROTOCOL.MODBUS_TCP then
                 ---@cast packet modbus_frame
                 if rtu_state.linked then
-                    local return_code = false
+                    local return_code   ---@type boolean
-                    local reply = modbus.reply__neg_ack(packet)
+                    local reply         ---@type modbus_packet
 
                     -- handle MODBUS instruction
                     if packet.unit_id <= #units then
@@ -382,7 +381,7 @@ function rtu.comms(version, modem, local_port, server_port, range, conn_watchdog
                     else
                         -- unit ID out of range?
                         reply = modbus.reply__gw_unavailable(packet)
-                        log.error("received MODBUS packet for non-existent unit")
+                        log.debug("received MODBUS packet for non-existent unit")
                     end
 
                     public.send_modbus(reply)
@@ -419,6 +418,9 @@ function rtu.comms(version, modem, local_port, server_port, range, conn_watchdog
                         end
 
                         self.last_est_ack = est_ack
+
+                        -- report link state
+                        databus.tx_link_state(est_ack + 1)
                     else
                         log.debug("SCADA_MGMT establish packet length mismatch")
                     end
@@ -450,7 +452,7 @@ function rtu.comms(version, modem, local_port, server_port, range, conn_watchdog
                         public.send_advertisement(units)
                     else
                         -- not supported
-                        log.warning("received unsupported SCADA_MGMT message type " .. packet.type)
+                        log.debug("received unsupported SCADA_MGMT message type " .. packet.type)
                     end
                 else
                     log.debug("discarding non-link SCADA_MGMT packet before linked")

rtu/startup.lua

@@ -4,6 +4,7 @@
 
 require("/initenv").init_env()
 
+local comms        = require("scada-common.comms")
 local crash        = require("scada-common.crash")
 local log          = require("scada-common.log")
 local mqueue       = require("scada-common.mqueue")
@@ -13,7 +14,9 @@ local types        = require("scada-common.types")
 local util         = require("scada-common.util")
 
 local config       = require("rtu.config")
+local databus      = require("rtu.databus")
 local modbus       = require("rtu.modbus")
+local renderer     = require("rtu.renderer")
 local rtu          = require("rtu.rtu")
 local threads      = require("rtu.threads")
 
@@ -25,13 +28,12 @@ local sna_rtu      = require("rtu.dev.sna_rtu")
 local sps_rtu      = require("rtu.dev.sps_rtu")
 local turbinev_rtu = require("rtu.dev.turbinev_rtu")
 
-local RTU_VERSION = "v0.13.0"
+local RTU_VERSION = "v1.2.1"
 
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
+local RTU_UNIT_HW_STATE = databus.RTU_UNIT_HW_STATE
 
-local print = util.print
 local println = util.println
-local print_ts = util.print_ts
 local println_ts = util.println_ts
 
 ----------------------------------------
@@ -55,7 +57,7 @@ assert(cfv.valid(), "bad config file: missing/invalid fields")
 -- log init
 ----------------------------------------
 
-log.init(config.LOG_PATH, config.LOG_MODE)
+log.init(config.LOG_PATH, config.LOG_MODE, config.LOG_DEBUG == true)
 
 log.info("========================================")
 log.info("BOOTING rtu.startup " .. RTU_VERSION)
@@ -73,6 +75,9 @@ local function main()
     -- startup
     ----------------------------------------
 
+    -- record firmware versions and ID
+    databus.tx_versions(RTU_VERSION, comms.version)
+
     -- mount connected devices
     ppm.mount_all()
 
@@ -81,6 +86,7 @@ local function main()
         -- RTU system state flags
         ---@class rtu_state
         rtu_state = {
+            fp_ok = false,
             linked = false,
             shutdown = false
         },
@@ -113,6 +119,8 @@ local function main()
         return
     end
 
+    databus.tx_hw_modem(true)
+
     ----------------------------------------
     -- interpret config and init units
     ----------------------------------------
@@ -252,6 +260,8 @@ local function main()
                 log.info(util.c("configure> initialized RTU unit #", #units, ": redstone_io (redstone) [1] for ", for_message))
 
                 unit.uid = #units
+
+                databus.tx_unit_hw_status(unit.uid, RTU_UNIT_HW_STATE.OK)
             end
         end
 
@@ -287,11 +297,12 @@ local function main()
 
             local device = ppm.get_periph(name)
 
-            local type = nil            ---@type string|nil
+            local type                  ---@type string|nil
-            local rtu_iface = nil       ---@type rtu_device
+            local rtu_iface             ---@type rtu_device
-            local rtu_type = nil        ---@type RTU_UNIT_TYPE
+            local rtu_type              ---@type RTU_UNIT_TYPE
-            local is_multiblock = false
+            local is_multiblock = false ---@type boolean
             local formed = nil          ---@type boolean|nil
+            local faulted = nil         ---@type boolean|nil
 
             if device == nil then
                 local message = util.c("configure> '", name, "' not found, using placeholder")
@@ -307,7 +318,7 @@ local function main()
             if type == "boilerValve" then
                 -- boiler multiblock
                 rtu_type = RTU_UNIT_TYPE.BOILER_VALVE
-                rtu_iface = boilerv_rtu.new(device)
+                rtu_iface, faulted = boilerv_rtu.new(device)
                 is_multiblock = true
                 formed = device.isFormed()
 
@@ -319,7 +330,7 @@ local function main()
             elseif type == "turbineValve" then
                 -- turbine multiblock
                 rtu_type = RTU_UNIT_TYPE.TURBINE_VALVE
-                rtu_iface = turbinev_rtu.new(device)
+                rtu_iface, faulted = turbinev_rtu.new(device)
                 is_multiblock = true
                 formed = device.isFormed()
 
@@ -331,7 +342,7 @@ local function main()
             elseif type == "inductionPort" then
                 -- induction matrix multiblock
                 rtu_type = RTU_UNIT_TYPE.IMATRIX
-                rtu_iface = imatrix_rtu.new(device)
+                rtu_iface, faulted = imatrix_rtu.new(device)
                 is_multiblock = true
                 formed = device.isFormed()
 
@@ -343,7 +354,7 @@ local function main()
             elseif type == "spsPort" then
                 -- SPS multiblock
                 rtu_type = RTU_UNIT_TYPE.SPS
-                rtu_iface = sps_rtu.new(device)
+                rtu_iface, faulted = sps_rtu.new(device)
                 is_multiblock = true
                 formed = device.isFormed()
 
@@ -355,11 +366,11 @@ local function main()
             elseif type == "solarNeutronActivator" then
                 -- SNA
                 rtu_type = RTU_UNIT_TYPE.SNA
-                rtu_iface = sna_rtu.new(device)
+                rtu_iface, faulted = sna_rtu.new(device)
             elseif type == "environmentDetector" then
                 -- advanced peripherals environment detector
                 rtu_type = RTU_UNIT_TYPE.ENV_DETECTOR
-                rtu_iface = envd_rtu.new(device)
+                rtu_iface, faulted = envd_rtu.new(device)
             elseif type == ppm.VIRTUAL_DEVICE_TYPE then
                 -- placeholder device
                 rtu_type = RTU_UNIT_TYPE.VIRTUAL
@@ -371,6 +382,17 @@ local function main()
                 return false
             end
 
+            if is_multiblock then
+                if not formed then
+                    log.info(util.c("configure> device '", name, "' is not formed"))
+                elseif faulted then
+                    -- sometimes there is a race condition on server boot where it reports formed, but
+                    -- the other functions are not yet defined (that's the theory at least). mark as unformed to attempt connection later
+                    formed = false
+                    log.warning(util.c("configure> device '", name, "' is formed, but initialization had one or more faults: marked as unformed"))
+                end
+            end
+
             ---@class rtu_unit_registry_entry
             local rtu_unit = {
                 uid = 0,                                ---@type integer
@@ -391,10 +413,6 @@ local function main()
 
             table.insert(units, rtu_unit)
 
-            if is_multiblock and not formed then
-                log.info(util.c("configure> device '", name, "' is not formed"))
-            end
-
             local for_message = "facility"
             if for_reactor > 0 then
                 for_message = util.c("reactor ", for_reactor)
@@ -403,6 +421,20 @@ local function main()
             log.info(util.c("configure> initialized RTU unit #", #units, ": ", name, " (", types.rtu_type_to_string(rtu_type), ") [", index, "] for ", for_message))
 
             rtu_unit.uid = #units
+
+            -- report hardware status
+            if rtu_unit.type == RTU_UNIT_TYPE.VIRTUAL then
+                databus.tx_unit_hw_status(rtu_unit.uid, RTU_UNIT_HW_STATE.OFFLINE)
+            else
+                if rtu_unit.is_multiblock then
+                    databus.tx_unit_hw_status(rtu_unit.uid, util.trinary(rtu_unit.formed == true, RTU_UNIT_HW_STATE.OK, RTU_UNIT_HW_STATE.UNFORMED))
+                elseif faulted then
+                    databus.tx_unit_hw_status(rtu_unit.uid, RTU_UNIT_HW_STATE.FAULTED)
+                else
+                    databus.tx_unit_hw_status(rtu_unit.uid, RTU_UNIT_HW_STATE.OK)
+                end
+            end
+
         end
 
         -- we made it through all that trusting-user-to-write-a-config-file chaos
@@ -413,9 +445,23 @@ local function main()
     -- start system
     ----------------------------------------
 
+    local rtu_state = __shared_memory.rtu_state
+
     log.debug("boot> running configure()")
 
     if configure() then
+        -- start UI
+        local message
+        rtu_state.fp_ok, message = pcall(renderer.start_ui, units)
+
+        if not rtu_state.fp_ok then
+            renderer.close_ui()
+            println_ts(util.c("UI error: ", message))
+            println("init> running without front panel")
+            log.error(util.c("GUI crashed with error ", message))
+            log.info("init> running in headless mode without front panel")
+        end
+
         -- start connection watchdog
         smem_sys.conn_watchdog = util.new_watchdog(config.COMMS_TIMEOUT)
         log.debug("startup> conn watchdog started")
@@ -445,8 +491,15 @@ local function main()
         println("configuration failed, exiting...")
     end
 
+    renderer.close_ui()
+
     println_ts("exited")
     log.info("exited")
 end
 
-if not xpcall(main, crash.handler) then crash.exit() end
+if not xpcall(main, crash.handler) then
+    pcall(renderer.close_ui)
+    crash.exit()
+else
+    log.close()
+end

rtu/threads.lua

@@ -4,6 +4,10 @@ local ppm          = require("scada-common.ppm")
 local types        = require("scada-common.types")
 local util         = require("scada-common.util")
 
+local databus      = require("rtu.databus")
+local modbus       = require("rtu.modbus")
+local renderer     = require("rtu.renderer")
+
 local boilerv_rtu  = require("rtu.dev.boilerv_rtu")
 local envd_rtu     = require("rtu.dev.envd_rtu")
 local imatrix_rtu  = require("rtu.dev.imatrix_rtu")
@@ -11,16 +15,12 @@ local sna_rtu      = require("rtu.dev.sna_rtu")
 local sps_rtu      = require("rtu.dev.sps_rtu")
 local turbinev_rtu = require("rtu.dev.turbinev_rtu")
 
-local modbus       = require("rtu.modbus")
+local core         = require("graphics.core")
 
 local threads = {}
 
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
-
+local UNIT_HW_STATE = databus.RTU_UNIT_HW_STATE
-local print = util.print
-local println = util.println
-local print_ts = util.print_ts
-local println_ts = util.println_ts
 
 local MAIN_CLOCK  = 2   -- (2Hz, 40 ticks)
 local COMMS_SLEEP = 100 -- (100ms, 2 ticks)
@@ -29,11 +29,15 @@ local COMMS_SLEEP = 100 -- (100ms, 2 ticks)
 ---@nodiscard
 ---@param smem rtu_shared_memory
 function threads.thread__main(smem)
+    -- print a log message to the terminal as long as the UI isn't running
+    local function println_ts(message) if not smem.rtu_state.fp_ok then util.println_ts(message) end end
+
     ---@class parallel_thread
     local public = {}
 
     -- execute thread
     function public.exec()
+        databus.tx_rt_status("main", true)
         log.debug("main thread start")
 
         -- main loop clock
@@ -57,6 +61,9 @@ function threads.thread__main(smem)
             local event, param1, param2, param3, param4, param5 = util.pull_event()
 
             if event == "timer" and loop_clock.is_clock(param1) then
+                -- blink heartbeat indicator
+                databus.heartbeat()
+
                 -- start next clock timer
                 loop_clock.start()
 
@@ -85,6 +92,8 @@ function threads.thread__main(smem)
                         if device == rtu_dev.modem then
                             println_ts("wireless modem disconnected!")
                             log.warning("comms modem disconnected!")
+
+                            databus.tx_hw_modem(false)
                         else
                             log.warning("non-comms modem disconnected")
                         end
@@ -94,10 +103,11 @@ function threads.thread__main(smem)
                             if units[i].device == device then
                                 -- we are going to let the PPM prevent crashes
                                 -- return fault flags/codes to MODBUS queries
-                                local unit = units[i]
+                                local unit = units[i]   ---@type rtu_unit_registry_entry
                                 local type_name = types.rtu_type_to_string(unit.type)
                                 println_ts(util.c("lost the ", type_name, " on interface ", unit.name))
                                 log.warning(util.c("lost the ", type_name, " unit peripheral on interface ", unit.name))
+                                databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.OFFLINE)
                                 break
                             end
                         end
@@ -116,6 +126,8 @@ function threads.thread__main(smem)
 
                             println_ts("wireless modem reconnected.")
                             log.info("comms modem reconnected")
+
+                            databus.tx_hw_modem(true)
                         else
                             log.info("wired modem reconnected")
                         end
@@ -156,34 +168,49 @@ function threads.thread__main(smem)
                                         resend_advert = false
                                         log.error(util.c("virtual device '", unit.name, "' cannot init to an unknown type (", type, ")"))
                                     end
+
+                                    databus.tx_unit_hw_type(unit.uid, unit.type)
                                 end
 
                                 if unit.type == RTU_UNIT_TYPE.BOILER_VALVE then
                                     unit.rtu = boilerv_rtu.new(device)
                                      -- if not formed, indexing the multiblock functions would have resulted in a PPM fault
                                     unit.formed = util.trinary(device.__p_is_faulted(), false, nil)
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.UNFORMED)
                                 elseif unit.type == RTU_UNIT_TYPE.TURBINE_VALVE then
                                     unit.rtu = turbinev_rtu.new(device)
                                      -- if not formed, indexing the multiblock functions would have resulted in a PPM fault
                                     unit.formed = util.trinary(device.__p_is_faulted(), false, nil)
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.UNFORMED)
                                 elseif unit.type == RTU_UNIT_TYPE.IMATRIX then
                                     unit.rtu = imatrix_rtu.new(device)
                                      -- if not formed, indexing the multiblock functions would have resulted in a PPM fault
                                     unit.formed = util.trinary(device.__p_is_faulted(), false, nil)
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.UNFORMED)
                                 elseif unit.type == RTU_UNIT_TYPE.SPS then
                                     unit.rtu = sps_rtu.new(device)
                                      -- if not formed, indexing the multiblock functions would have resulted in a PPM fault
                                     unit.formed = util.trinary(device.__p_is_faulted(), false, nil)
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.UNFORMED)
                                 elseif unit.type == RTU_UNIT_TYPE.SNA then
                                     unit.rtu = sna_rtu.new(device)
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.OK)
                                 elseif unit.type == RTU_UNIT_TYPE.ENV_DETECTOR then
                                     unit.rtu = envd_rtu.new(device)
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.OK)
                                 else
                                     log.error(util.c("failed to identify reconnected RTU unit type (", unit.name, ")"), true)
                                 end
 
-                                if unit.is_multiblock and (unit.formed == false) then
+                                if unit.is_multiblock then
-                                    log.info(util.c("assuming ", unit.name, " is not formed due to PPM faults while initializing"))
+                                    if (unit.formed == false) then
+                                        log.info(util.c("assuming ", unit.name, " is not formed due to PPM faults while initializing"))
+                                        databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.UNFORMED)
+                                    end
+                                elseif device.__p_is_faulted() then
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.FAULTED)
+                                else
+                                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.OK)
                                 end
 
                                 unit.modbus_io = modbus.new(unit.rtu, true)
@@ -196,12 +223,15 @@ function threads.thread__main(smem)
                                 if resend_advert then
                                     rtu_comms.send_advertisement(units)
                                 else
-                                     rtu_comms.send_remounted(unit.uid)
+                                    rtu_comms.send_remounted(unit.uid)
                                 end
                             end
                         end
                     end
                 end
+            elseif event == "mouse_click" or event == "mouse_up" or event == "mouse_drag" or event == "mouse_scroll" then
+                -- handle a mouse event
+                renderer.handle_mouse(core.events.new_mouse_event(event, param1, param2, param3))
             end
 
             -- check for termination request
@@ -223,6 +253,8 @@ function threads.thread__main(smem)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("main", false)
+
             if not rtu_state.shutdown then
                 log.info("main thread restarting in 5 seconds...")
                 util.psleep(5)
@@ -242,6 +274,7 @@ function threads.thread__comms(smem)
 
     -- execute thread
     function public.exec()
+        databus.tx_rt_status("comms", true)
         log.debug("comms thread start")
 
         -- load in from shared memory
@@ -297,6 +330,8 @@ function threads.thread__comms(smem)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("comms", false)
+
             if not rtu_state.shutdown then
                 log.info("comms thread restarting in 5 seconds...")
                 util.psleep(5)
@@ -317,7 +352,8 @@ function threads.thread__unit_comms(smem, unit)
 
     -- execute thread
     function public.exec()
-        log.debug(util.c("rtu unit thread start -> ", types.rtu_type_to_string(unit.type), "(", unit.name, ")"))
+        databus.tx_rt_status("unit_" .. unit.uid, true)
+        log.debug(util.c("rtu unit thread start -> ", types.rtu_type_to_string(unit.type), " (", unit.name, ")"))
 
         -- load in from shared memory
         local rtu_state    = smem.rtu_state
@@ -351,6 +387,13 @@ function threads.thread__unit_comms(smem, unit)
                         -- received a packet
                         local _, reply = unit.modbus_io.handle_packet(msg.message)
                         rtu_comms.send_modbus(reply)
+
+                        -- check if there was a problem and update the hardware state if so
+                        local frame = reply.get()
+                        if unit.formed and (bit.band(frame.func_code, types.MODBUS_FCODE.ERROR_FLAG) ~= 0) and
+                           (frame.data[1] == types.MODBUS_EXCODE.SERVER_DEVICE_FAIL) then
+                            databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.FAULTED)
+                        end
                     end
                 end
 
@@ -364,7 +407,14 @@ function threads.thread__unit_comms(smem, unit)
 
                 last_f_check = util.time_ms()
 
-                if unit.formed == nil then unit.formed = is_formed end
+                if unit.formed == nil then
+                    unit.formed = is_formed
+                    if is_formed then databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.OK) end
+                end
+
+                if not unit.formed then
+                    databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.UNFORMED)
+                end
 
                 if (not unit.formed) and is_formed then
                     -- newly re-formed
@@ -375,43 +425,53 @@ function threads.thread__unit_comms(smem, unit)
                         ppm.unmount(unit.device)
 
                         local type, device = ppm.mount(iface)
+                        local faulted = false
 
                         if device ~= nil then
                             if type == "boilerValve" and unit.type == RTU_UNIT_TYPE.BOILER_VALVE then
                                 -- boiler multiblock
                                 unit.device = device
-                                unit.rtu = boilerv_rtu.new(device)
+                                unit.rtu, faulted = boilerv_rtu.new(device)
                                 unit.formed = device.isFormed()
                                 unit.modbus_io = modbus.new(unit.rtu, true)
                             elseif type == "turbineValve" and unit.type == RTU_UNIT_TYPE.TURBINE_VALVE then
                                 -- turbine multiblock
                                 unit.device = device
-                                unit.rtu = turbinev_rtu.new(device)
+                                unit.rtu, faulted = turbinev_rtu.new(device)
                                 unit.formed = device.isFormed()
                                 unit.modbus_io = modbus.new(unit.rtu, true)
                             elseif type == "inductionPort" and unit.type == RTU_UNIT_TYPE.IMATRIX then
                                 -- induction matrix multiblock
                                 unit.device = device
-                                unit.rtu = imatrix_rtu.new(device)
+                                unit.rtu, faulted = imatrix_rtu.new(device)
                                 unit.formed = device.isFormed()
                                 unit.modbus_io = modbus.new(unit.rtu, true)
                             elseif type == "spsPort" and unit.type == RTU_UNIT_TYPE.SPS then
                                 -- SPS multiblock
                                 unit.device = device
-                                unit.rtu = sps_rtu.new(device)
+                                unit.rtu, faulted = sps_rtu.new(device)
                                 unit.formed = device.isFormed()
                                 unit.modbus_io = modbus.new(unit.rtu, true)
                             else
-                                log.error("illegal remount of non-multiblock RTU attempted for " .. short_name, true)
+                                log.error("illegal remount of non-multiblock RTU or type change attempted for " .. short_name, true)
                             end
 
-                            rtu_comms.send_remounted(unit.uid)
+                            if unit.formed and faulted then
+                                -- something is still wrong = can't mark as formed yet
+                                unit.formed = false
+                                log.info(util.c("assuming ", unit.name, " is not formed due to PPM faults while initializing"))
+                                databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.UNFORMED)
+                            else
+                                rtu_comms.send_remounted(unit.uid)
+                                databus.tx_unit_hw_status(unit.uid, UNIT_HW_STATE.OK)
+                            end
+
+                            local type_name = types.rtu_type_to_string(unit.type)
+                            log.info(util.c("reconnected the ", type_name, " on interface ", unit.name))
                         else
                             -- fully lost the peripheral now :(
                             log.error(util.c(unit.name, " lost (failed reconnect)"))
                         end
-
-                        log.info(util.c("reconnected the ", unit.type, " on interface ", unit.name))
                     else
                         log.error("failed to get interface of previously connected RTU unit " .. detail_name, true)
                     end
@@ -441,8 +501,10 @@ function threads.thread__unit_comms(smem, unit)
                 log.fatal(util.strval(result))
             end
 
+            databus.tx_rt_status("unit_" .. unit.uid, false)
+
             if not rtu_state.shutdown then
-                log.info(util.c("rtu unit thread ", types.rtu_type_to_string(unit.type), "(", unit.name, " restarting in 5 seconds..."))
+                log.info(util.c("rtu unit thread ", types.rtu_type_to_string(unit.type), " (", unit.name, ") restarting in 5 seconds..."))
                 util.psleep(5)
             end
         end

scada-common/comms.lua

@@ -2,7 +2,7 @@
 -- Communications
 --
 
-local log   = require("scada-common.log")
+local log = require("scada-common.log")
 
 ---@class comms
 local comms = {}
@@ -11,7 +11,7 @@ local insert = table.insert
 
 local max_distance = nil
 
-comms.version = "1.4.0"
+comms.version = "1.4.1"
 
 ---@enum PROTOCOL
 local PROTOCOL = {
@@ -74,7 +74,8 @@ local DEVICE_TYPE = {
     PLC = 0,            -- PLC device type for establish
     RTU = 1,            -- RTU device type for establish
     SV = 2,             -- supervisor device type for establish
-    CRDN = 3            -- coordinator device type for establish
+    CRDN = 3,           -- coordinator device type for establish
+    PKT = 4             -- pocket device type for establish
 }
 
 ---@enum PLC_AUTO_ACK

scada-common/crash.lua

@@ -39,6 +39,7 @@ end
 
 -- final error print on failed xpcall, app exits here
 function crash.exit()
+    log.close()
     util.println("fatal error occured in main application:")
     error(err, 0)
 end

scada-common/crypto.lua

@@ -5,7 +5,6 @@
 local aes128   = require("lockbox.cipher.aes128")
 local ctr_mode = require("lockbox.cipher.mode.ctr")
 local sha1     = require("lockbox.digest.sha1")
-local sha2_224 = require("lockbox.digest.sha2_224")
 local sha2_256 = require("lockbox.digest.sha2_256")
 local pbkdf2   = require("lockbox.kdf.pbkdf2")
 local hmac     = require("lockbox.mac.hmac")
@@ -157,10 +156,6 @@ end
 -- wrap a modem as a secure modem to send encrypted traffic
 ---@param modem table modem to wrap
 function crypto.secure_modem(modem)
-    local self = {
-        modem = modem
-    }
-
     ---@class secure_modem
     ---@field open function
     ---@field isOpen function
@@ -177,17 +172,17 @@ function crypto.secure_modem(modem)
     local public = {}
 
     -- wrap a modem
-    ---@param modem table
+    ---@param reconnected_modem table
 ---@diagnostic disable-next-line: redefined-local
-    function public.wrap(modem)
+    function public.wrap(reconnected_modem)
-        self.modem = modem
+        modem = reconnected_modem
-        for key, func in pairs(self.modem) do
+        for key, func in pairs(modem) do
             public[key] = func
         end
     end
 
     -- wrap modem functions, then we replace transmit
-    public.wrap(self.modem)
+    public.wrap(modem)
 
     -- send a packet with encryption
     ---@param channel integer
@@ -198,9 +193,9 @@ function crypto.secure_modem(modem)
 
         local iv, ciphertext = crypto.encrypt(plaintext)
 ---@diagnostic disable-next-line: redefined-local
-        local hmac = crypto.hmac(iv .. ciphertext)
+        local computed_hmac = crypto.hmac(iv .. ciphertext)
 
-        self.modem.transmit(channel, reply_channel, { hmac, iv, ciphertext })
+        modem.transmit(channel, reply_channel, { computed_hmac, iv, ciphertext })
     end
 
     -- parse in a modem message as a network packet
@@ -217,13 +212,13 @@ function crypto.secure_modem(modem)
         if type(message) == "table" then
             if #message == 3 then
 ---@diagnostic disable-next-line: redefined-local
-                local hmac = message[1]
+                local rx_hmac = message[1]
                 local iv = message[2]
                 local ciphertext = message[3]
 
                 local computed_hmac = crypto.hmac(iv .. ciphertext)
 
-                if hmac == computed_hmac then
+                if rx_hmac == computed_hmac then
                     -- message intact
                     local plaintext = crypto.decrypt(iv, ciphertext)
                     body = textutils.unserialize(plaintext)

scada-common/log.lua

@@ -15,12 +15,10 @@ local MODE = {
 
 log.MODE = MODE
 
--- whether to log debug messages or not
+local logger = {
-local LOG_DEBUG = false
-
-local log_sys = {
     path = "/log.txt",
     mode = MODE.APPEND,
+    debug = false,
     file = nil,
     dmesg_out = nil
 }
@@ -28,30 +26,9 @@ local log_sys = {
 ---@type function
 local free_space = fs.getFreeSpace
 
--- initialize logger
+-----------------------
----@param path string file path
+-- PRIVATE FUNCTIONS --
----@param write_mode MODE
+-----------------------
----@param dmesg_redirect? table terminal/window to direct dmesg to
-function log.init(path, write_mode, dmesg_redirect)
-    log_sys.path = path
-    log_sys.mode = write_mode
-
-    if log_sys.mode == MODE.APPEND then
-        log_sys.file = fs.open(path, "a")
-    else
-        log_sys.file = fs.open(path, "w")
-    end
-
-    if dmesg_redirect then
-        log_sys.dmesg_out = dmesg_redirect
-    else
-        log_sys.dmesg_out = term.current()
-    end
-end
-
--- direct dmesg output to a monitor/window
----@param window table window or terminal reference
-function log.direct_dmesg(window) log_sys.dmesg_out = window end
 
 -- private log write function
 ---@param msg string
@@ -62,8 +39,8 @@ local function _log(msg)
 
     -- attempt to write log
     local status, result = pcall(function ()
-        log_sys.file.writeLine(stamped)
+        logger.file.writeLine(stamped)
-        log_sys.file.flush()
+        logger.file.flush()
     end)
 
     -- if we don't have space, we need to create a new log file
@@ -78,21 +55,57 @@ local function _log(msg)
         end
     end
 
-    if out_of_space or (free_space(log_sys.path) < 100) then
+    if out_of_space or (free_space(logger.path) < 100) then
         -- delete the old log file before opening a new one
-        log_sys.file.close()
+        logger.file.close()
-        fs.delete(log_sys.path)
+        fs.delete(logger.path)
 
         -- re-init logger and pass dmesg_out so that it doesn't change
-        log.init(log_sys.path, log_sys.mode, log_sys.dmesg_out)
+        log.init(logger.path, logger.mode, logger.debug, logger.dmesg_out)
 
         -- leave a message
-        log_sys.file.writeLine(time_stamp .. "recycled log file")
+        logger.file.writeLine(time_stamp .. "recycled log file")
-        log_sys.file.writeLine(stamped)
+        logger.file.writeLine(stamped)
-        log_sys.file.flush()
+        logger.file.flush()
     end
 end
 
+----------------------
+-- PUBLIC FUNCTIONS --
+----------------------
+
+-- initialize logger
+---@param path string file path
+---@param write_mode MODE file write mode
+---@param include_debug boolean whether or not to include debug logs
+---@param dmesg_redirect? table terminal/window to direct dmesg to
+function log.init(path, write_mode, include_debug, dmesg_redirect)
+    logger.path = path
+    logger.mode = write_mode
+    logger.debug = include_debug
+
+    if logger.mode == MODE.APPEND then
+        logger.file = fs.open(path, "a")
+    else
+        logger.file = fs.open(path, "w")
+    end
+
+    if dmesg_redirect then
+        logger.dmesg_out = dmesg_redirect
+    else
+        logger.dmesg_out = term.current()
+    end
+end
+
+-- close the log file handle
+function log.close()
+    logger.file.close()
+end
+
+-- direct dmesg output to a monitor/window
+---@param window table window or terminal reference
+function log.direct_dmesg(window) logger.dmesg_out = window end
+
 -- dmesg style logging for boot because I like linux-y things
 ---@param msg string message
 ---@param tag? string log tag
@@ -107,7 +120,7 @@ function log.dmesg(msg, tag, tag_color)
     tag = util.strval(tag)
 
     local t_stamp = string.format("%12.2f", os.clock())
-    local out = log_sys.dmesg_out
+    local out = logger.dmesg_out
 
     if out ~= nil then
         local out_w, out_h = out.getSize()
@@ -203,7 +216,7 @@ end
 function log.dmesg_working(msg, tag, tag_color)
     local ts_coord = log.dmesg(msg, tag, tag_color)
 
-    local out = log_sys.dmesg_out
+    local out = logger.dmesg_out
     local width = (ts_coord.x2 - ts_coord.x1) + 1
 
     if out ~= nil then
@@ -262,7 +275,7 @@ end
 ---@param msg string message
 ---@param trace? boolean include file trace
 function log.debug(msg, trace)
-    if LOG_DEBUG then
+    if logger.debug then
         local dbg_info = ""
 
         if trace then

scada-common/psil.lua

@@ -2,6 +2,8 @@
 -- Publisher-Subscriber Interconnect Layer
 --
 
+local util = require("scada-common.util")
+
 local psil = {}
 
 -- instantiate a new PSI layer
@@ -36,6 +38,15 @@ function psil.create()
         table.insert(self.ic[key].subscribers, { notify = func })
     end
 
+    -- unsubscribe a function from a given key
+    ---@param key string data key
+    ---@param func function function to unsubscribe
+    function public.unsubscribe(key, func)
+        if self.ic[key] ~= nil then
+            util.filter_table(self.ic[key].subscribers, function (s) return s.notify ~= func end)
+        end
+    end
+
     -- publish data to a given key, passing it to all subscribers if it has changed
     ---@param key string data key
     ---@param value any data value
@@ -51,6 +62,22 @@ function psil.create()
         self.ic[key].value = value
     end
 
+    -- publish a toggled boolean value to a given key, passing it to all subscribers if it has changed<br>
+    -- this is intended to be used to toggle boolean indicators such as heartbeats without extra state variables
+    ---@param key string data key
+    function public.toggle(key)
+        if self.ic[key] == nil then alloc(key) end
+
+        self.ic[key].value = self.ic[key].value == false
+
+        for i = 1, #self.ic[key].subscribers do
+            self.ic[key].subscribers[i].notify(self.ic[key].value)
+        end
+    end
+
+    -- clear the contents of the interconnect
+    function public.purge() self.ic = nil end
+
     return public
 end
 

scada-common/types.lua

@@ -39,6 +39,10 @@ function types.new_radiation_reading(r, u) return { radiation = r, unit = u } en
 ---@return radiation_reading
 function types.new_zero_radiation_reading() return { radiation = 0, unit = "nSv" } end
 
+---@class coordinate_2d
+---@field x integer
+---@field y integer
+
 ---@class coordinate
 ---@field x integer
 ---@field y integer

scada-common/util.lua

@@ -2,6 +2,8 @@
 -- Utility Functions
 --
 
+local cc_strings = require("cc.strings")
+
 ---@class util
 local util = {}
 
@@ -104,58 +106,20 @@ function util.pad(str, n)
     return util.spaces(lpad) .. str .. util.spaces(rpad)
 end
 
--- wrap a string into a table of lines, supporting single dash splits
+-- wrap a string into a table of lines
 ---@nodiscard
 ---@param str string
 ---@param limit integer line limit
 ---@return table lines
-function util.strwrap(str, limit)
+function util.strwrap(str, limit) return cc_strings.wrap(str, limit) end
-    local lines = {}
-    local ln_start = 1
 
-    local first_break = str:find("([%-%s]+)")
+-- luacheck: no unused args
-
-    if first_break ~= nil then
-        lines[1] = string.sub(str, 1, first_break - 1)
-    else
-        lines[1] = str
-    end
-
----@diagnostic disable-next-line: discard-returns
-    str:gsub("(%s+)()(%S+)()",
-        function(space, start, word, stop)
-            -- support splitting SINGLE DASH words
-            word:gsub("(%S+)(%-)()(%S+)()",
-                function (pre, dash, d_start, post, d_stop)
-                    if (stop + d_stop) - ln_start <= limit then
-                        -- do nothing, it will entirely fit
-                    elseif ((start + d_start) + 1) - ln_start <= limit then
-                        -- we can fit including the dash
-                        lines[#lines] = lines[#lines] .. space .. pre .. dash
-                        -- drop the space and replace the word with the post
-                        space = ""
-                        word = post
-                        -- force a wrap
-                        stop = limit + 1 + ln_start
-                        -- change start position for new line start
-                        start = start + d_start - 1
-                    end
-                end)
-            -- can we append this or do we have to start a new line?
-            if stop - ln_start > limit then
-                -- starting new line
-                ln_start = start
-                lines[#lines + 1] = word
-            else lines[#lines] = lines[#lines] .. space .. word end
-        end)
-
-    return lines
-end
 
 -- concatenation with built-in to string
 ---@nodiscard
 ---@vararg any
 ---@return string
+---@diagnostic disable-next-line: unused-vararg
 function util.concat(...)
     local str = ""
     for _, v in ipairs(arg) do str = str .. util.strval(v) end
@@ -169,10 +133,13 @@ util.c = util.concat
 ---@nodiscard
 ---@param format string
 ---@vararg any
+---@diagnostic disable-next-line: unused-vararg
 function util.sprintf(format, ...)
     return string.format(format, table.unpack(arg))
 end
 
+-- luacheck: unused args
+
 -- format a number string with commas as the thousands separator<br>
 -- subtracts from spaces at the start if present for each comma used
 ---@nodiscard

startup.lua

@@ -7,7 +7,7 @@ local println_ts = util.println_ts
 
 println("SCADA BOOTLOADER V" .. BOOTLOADER_VERSION)
 
-local exit_code = false
+local exit_code ---@type boolean
 
 println_ts("BOOT> SCANNING FOR APPLICATIONS...")
 

supervisor/config.lua

@@ -2,14 +2,15 @@ local config = {}
 
 -- scada network listen for PLC's and RTU's
 config.SCADA_DEV_LISTEN = 16000
--- listen port for SCADA supervisor access by coordinators
+-- listen port for SCADA supervisor access
-config.SCADA_SV_LISTEN = 16100
+config.SCADA_SV_CTL_LISTEN = 16100
 -- max trusted modem message distance (0 to disable check)
 config.TRUSTED_RANGE = 0
 -- time in seconds (>= 2) before assuming a remote device is no longer active
 config.PLC_TIMEOUT = 5
 config.RTU_TIMEOUT = 5
 config.CRD_TIMEOUT = 5
+config.PKT_TIMEOUT = 5
 
 -- expected number of reactors
 config.NUM_REACTORS = 4
@@ -27,5 +28,7 @@ config.LOG_PATH = "/log.txt"
 --  0 = APPEND (adds to existing file on start)
 --  1 = NEW (replaces existing file on start)
 config.LOG_MODE = 0
+-- true to log verbose debug messages
+config.LOG_DEBUG = false
 
 return config

supervisor/session/coordinator.lua

@@ -16,16 +16,12 @@ local FAC_COMMAND = comms.FAC_COMMAND
 
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
 
-local SV_Q_CMDS = svqtypes.SV_Q_CMDS
 local SV_Q_DATA = svqtypes.SV_Q_DATA
 
-local print = util.print
 local println = util.println
-local print_ts = util.print_ts
-local println_ts = util.println_ts
 
 -- retry time constants in ms
-local INITIAL_WAIT = 1500
+-- local INITIAL_WAIT = 1500
 local RETRY_PERIOD = 1000
 local PARTIAL_RETRY_PERIOD = 2000
 
@@ -177,12 +173,12 @@ function coordinator.new_session(id, in_queue, out_queue, timeout, facility)
     end
 
     -- handle a packet
-    ---@param pkt crdn_frame
+    ---@param pkt mgmt_frame|crdn_frame
     local function _handle_packet(pkt)
         -- check sequence number
         if self.r_seq_num == nil then
             self.r_seq_num = pkt.scada_frame.seq_num()
-        elseif self.r_seq_num >= pkt.scada_frame.seq_num() then
+        elseif (self.r_seq_num + 1) ~= pkt.scada_frame.seq_num() then
             log.warning(log_header .. "sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. pkt.scada_frame.seq_num())
             return
         else
@@ -194,11 +190,12 @@ function coordinator.new_session(id, in_queue, out_queue, timeout, facility)
 
         -- process packet
         if pkt.scada_frame.protocol() == PROTOCOL.SCADA_MGMT then
+            ---@cast pkt mgmt_frame
             if pkt.type == SCADA_MGMT_TYPE.KEEP_ALIVE then
                 -- keep alive reply
                 if pkt.length == 2 then
                     local srv_start = pkt.data[1]
-                    local coord_send = pkt.data[2]
+                    -- local coord_send = pkt.data[2]
                     local srv_now = util.time()
                     self.last_rtt = srv_now - srv_start
 
@@ -218,6 +215,7 @@ function coordinator.new_session(id, in_queue, out_queue, timeout, facility)
                 log.debug(log_header .. "handler received unsupported SCADA_MGMT packet type " .. pkt.type)
             end
         elseif pkt.scada_frame.protocol() == PROTOCOL.SCADA_CRDN then
+            ---@cast pkt crdn_frame
             if pkt.type == SCADA_CRDN_TYPE.INITIAL_BUILDS then
                 -- acknowledgement to coordinator receiving builds
                 self.acks.builds = true
@@ -414,7 +412,7 @@ function coordinator.new_session(id, in_queue, out_queue, timeout, facility)
                                 _send(SCADA_CRDN_TYPE.FAC_BUILDS, { facility.get_build(cmd.val.type == RTU_UNIT_TYPE.IMATRIX) })
                             end
                         else
-                            log.warning(log_header .. "unsupported data command received in in_queue (this is a bug)")
+                            log.error(log_header .. "unsupported data command received in in_queue (this is a bug)", true)
                         end
                     end
                 end

supervisor/session/plc.lua

@@ -14,10 +14,7 @@ local SCADA_MGMT_TYPE = comms.SCADA_MGMT_TYPE
 local PLC_AUTO_ACK = comms.PLC_AUTO_ACK
 local UNIT_COMMAND = comms.UNIT_COMMAND
 
-local print = util.print
 local println = util.println
-local print_ts = util.print_ts
-local println_ts = util.println_ts
 
 -- retry time constants in ms
 local INITIAL_WAIT      = 1500
@@ -67,7 +64,7 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
         connected = true,
         received_struct = false,
         received_status_cache = false,
-        plc_conn_watchdog = util.new_watchdog(timeout),
+        conn_watchdog = util.new_watchdog(timeout),
         last_rtt = 0,
         -- periodic messages
         periodics = {
@@ -236,7 +233,7 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
 
     -- mark this PLC session as closed, stop watchdog
     local function _close()
-        self.plc_conn_watchdog.cancel()
+        self.conn_watchdog.cancel()
         self.connected = false
     end
 
@@ -276,18 +273,18 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
         if pkt.length == 1 then
             return pkt.data[1]
         else
-            log.warning(log_header .. "RPLC ACK length mismatch")
+            log.debug(log_header .. "RPLC ACK length mismatch")
             return nil
         end
     end
 
     -- handle a packet
-    ---@param pkt rplc_frame
+    ---@param pkt mgmt_frame|rplc_frame
     local function _handle_packet(pkt)
         -- check sequence number
         if self.r_seq_num == nil then
             self.r_seq_num = pkt.scada_frame.seq_num()
-        elseif self.r_seq_num >= pkt.scada_frame.seq_num() then
+        elseif (self.r_seq_num + 1) ~= pkt.scada_frame.seq_num() then
             log.warning(log_header .. "sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. pkt.scada_frame.seq_num())
             return
         else
@@ -296,14 +293,15 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
 
         -- process packet
         if pkt.scada_frame.protocol() == PROTOCOL.RPLC then
+            ---@cast pkt rplc_frame
             -- check reactor ID
             if pkt.id ~= reactor_id then
-                log.warning(log_header .. "RPLC packet with ID not matching reactor ID: reactor " .. reactor_id .. " != " .. pkt.id)
+                log.warning(log_header .. "discarding RPLC packet with ID not matching reactor ID: reactor " .. reactor_id .. " != " .. pkt.id)
                 return
             end
 
             -- feed watchdog
-            self.plc_conn_watchdog.feed()
+            self.conn_watchdog.feed()
 
             -- handle packet by type
             if pkt.type == RPLC_TYPE.STATUS then
@@ -472,11 +470,12 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
                 log.debug(log_header .. "handler received unsupported RPLC packet type " .. pkt.type)
             end
         elseif pkt.scada_frame.protocol() == PROTOCOL.SCADA_MGMT then
+            ---@cast pkt mgmt_frame
             if pkt.type == SCADA_MGMT_TYPE.KEEP_ALIVE then
                 -- keep alive reply
                 if pkt.length == 2 then
                     local srv_start = pkt.data[1]
-                    local plc_send = pkt.data[2]
+                    -- local plc_send = pkt.data[2]
                     local srv_now = util.time()
                     self.last_rtt = srv_now - srv_start
 
@@ -577,7 +576,7 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
     -- check if a timer matches this session's watchdog
     ---@nodiscard
     function public.check_wd(timer)
-        return self.plc_conn_watchdog.is_timer(timer) and self.connected
+        return self.conn_watchdog.is_timer(timer) and self.connected
     end
 
     -- close the connection
@@ -636,7 +635,7 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
                                 _send(RPLC_TYPE.RPS_AUTO_RESET, {})
                             end
                         else
-                            log.warning(log_header .. "unsupported command received in in_queue (this is a bug)")
+                            log.error(log_header .. "unsupported command received in in_queue (this is a bug)", true)
                         end
                     elseif message.qtype == mqueue.TYPE.DATA then
                         -- instruction with body
@@ -683,7 +682,7 @@ function plc.new_session(id, reactor_id, in_queue, out_queue, timeout)
                                 end
                             end
                         else
-                            log.warning(log_header .. "unsupported data command received in in_queue (this is a bug)")
+                            log.error(log_header .. "unsupported data command received in in_queue (this is a bug)", true)
                         end
                     end
                 end

supervisor/session/pocket.lua

@@ -0,0 +1,226 @@
+local comms    = require("scada-common.comms")
+local log      = require("scada-common.log")
+local mqueue   = require("scada-common.mqueue")
+local util     = require("scada-common.util")
+
+local pocket = {}
+
+local PROTOCOL = comms.PROTOCOL
+local SCADA_MGMT_TYPE = comms.SCADA_MGMT_TYPE
+
+local println = util.println
+
+-- retry time constants in ms
+-- local INITIAL_WAIT = 1500
+-- local RETRY_PERIOD = 1000
+
+local POCKET_S_CMDS = {
+}
+
+local POCKET_S_DATA = {
+}
+
+pocket.POCKET_S_CMDS = POCKET_S_CMDS
+pocket.POCKET_S_DATA = POCKET_S_DATA
+
+local PERIODICS = {
+    KEEP_ALIVE = 2000
+}
+
+-- pocket diagnostics session
+---@nodiscard
+---@param id integer session ID
+---@param in_queue mqueue in message queue
+---@param out_queue mqueue out message queue
+---@param timeout number communications timeout
+function pocket.new_session(id, in_queue, out_queue, timeout)
+    local log_header = "diag_session(" .. id .. "): "
+
+    local self = {
+        -- connection properties
+        seq_num = 0,
+        r_seq_num = nil,
+        connected = true,
+        conn_watchdog = util.new_watchdog(timeout),
+        last_rtt = 0,
+        -- periodic messages
+        periodics = {
+            last_update = 0,
+            keep_alive = 0
+        },
+        -- when to next retry one of these requests
+        retry_times = {
+        },
+        -- command acknowledgements
+        acks = {
+        },
+        -- session database
+        ---@class diag_db
+        sDB = {
+        }
+    }
+
+    ---@class diag_session
+    local public = {}
+
+    -- mark this diagnostics session as closed, stop watchdog
+    local function _close()
+        self.conn_watchdog.cancel()
+        self.connected = false
+    end
+
+    -- send a SCADA management packet
+    ---@param msg_type SCADA_MGMT_TYPE
+    ---@param msg table
+    local function _send_mgmt(msg_type, msg)
+        local s_pkt = comms.scada_packet()
+        local m_pkt = comms.mgmt_packet()
+
+        m_pkt.make(msg_type, msg)
+        s_pkt.make(self.seq_num, PROTOCOL.SCADA_MGMT, m_pkt.raw_sendable())
+
+        out_queue.push_packet(s_pkt)
+        self.seq_num = self.seq_num + 1
+    end
+
+    -- handle a packet
+    ---@param pkt mgmt_frame
+    local function _handle_packet(pkt)
+        -- check sequence number
+        if self.r_seq_num == nil then
+            self.r_seq_num = pkt.scada_frame.seq_num()
+        elseif (self.r_seq_num + 1) ~= pkt.scada_frame.seq_num() then
+            log.warning(log_header .. "sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. pkt.scada_frame.seq_num())
+            return
+        else
+            self.r_seq_num = pkt.scada_frame.seq_num()
+        end
+
+        -- feed watchdog
+        self.conn_watchdog.feed()
+
+        -- process packet
+        if pkt.scada_frame.protocol() == PROTOCOL.SCADA_MGMT then
+            ---@cast pkt mgmt_frame
+            if pkt.type == SCADA_MGMT_TYPE.KEEP_ALIVE then
+                -- keep alive reply
+                if pkt.length == 2 then
+                    local srv_start = pkt.data[1]
+                    -- local diag_send = pkt.data[2]
+                    local srv_now = util.time()
+                    self.last_rtt = srv_now - srv_start
+
+                    if self.last_rtt > 750 then
+                        log.warning(log_header .. "DIAG KEEP_ALIVE round trip time > 750ms (" .. self.last_rtt .. "ms)")
+                    end
+
+                    -- log.debug(log_header .. "DIAG RTT = " .. self.last_rtt .. "ms")
+                    -- log.debug(log_header .. "DIAG TT  = " .. (srv_now - diag_send) .. "ms")
+                else
+                    log.debug(log_header .. "SCADA keep alive packet length mismatch")
+                end
+            elseif pkt.type == SCADA_MGMT_TYPE.CLOSE then
+                -- close the session
+                _close()
+            else
+                log.debug(log_header .. "handler received unsupported SCADA_MGMT packet type " .. pkt.type)
+            end
+        end
+    end
+
+    -- PUBLIC FUNCTIONS --
+
+    -- get the session ID
+    ---@nodiscard
+    function public.get_id() return id end
+
+    -- get the session database
+    ---@nodiscard
+    function public.get_db() return self.sDB end
+
+    -- check if a timer matches this session's watchdog
+    ---@nodiscard
+    function public.check_wd(timer)
+        return self.conn_watchdog.is_timer(timer) and self.connected
+    end
+
+    -- close the connection
+    function public.close()
+        _close()
+        _send_mgmt(SCADA_MGMT_TYPE.CLOSE, {})
+        println("connection to pocket diag session " .. id .. " closed by server")
+        log.info(log_header .. "session closed by server")
+    end
+
+    -- iterate the session
+    ---@nodiscard
+    ---@return boolean connected
+    function public.iterate()
+        if self.connected then
+            ------------------
+            -- handle queue --
+            ------------------
+
+            local handle_start = util.time()
+
+            while in_queue.ready() and self.connected do
+                -- get a new message to process
+                local message = in_queue.pop()
+
+                if message ~= nil then
+                    if message.qtype == mqueue.TYPE.PACKET then
+                        -- handle a packet
+                        _handle_packet(message.message)
+                    elseif message.qtype == mqueue.TYPE.COMMAND then
+                        -- handle instruction
+                    elseif message.qtype == mqueue.TYPE.DATA then
+                        -- instruction with body
+                    end
+                end
+
+                -- max 100ms spent processing queue
+                if util.time() - handle_start > 100 then
+                    log.warning(log_header .. "exceeded 100ms queue process limit")
+                    break
+                end
+            end
+
+            -- exit if connection was closed
+            if not self.connected then
+                println("connection to pocket diag session " .. id .. " closed by remote host")
+                log.info(log_header .. "session closed by remote host")
+                return self.connected
+            end
+
+            ----------------------
+            -- update periodics --
+            ----------------------
+
+            local elapsed = util.time() - self.periodics.last_update
+
+            local periodics = self.periodics
+
+            -- keep alive
+
+            periodics.keep_alive = periodics.keep_alive + elapsed
+            if periodics.keep_alive >= PERIODICS.KEEP_ALIVE then
+                _send_mgmt(SCADA_MGMT_TYPE.KEEP_ALIVE, { util.time() })
+                periodics.keep_alive = 0
+            end
+
+            self.periodics.last_update = util.time()
+
+            ---------------------
+            -- attempt retries --
+            ---------------------
+
+            -- local rtimes = self.retry_times
+        end
+
+        return self.connected
+    end
+
+    return public
+end
+
+return pocket

supervisor/session/rtu.lua

@@ -22,10 +22,7 @@ local PROTOCOL = comms.PROTOCOL
 local SCADA_MGMT_TYPE = comms.SCADA_MGMT_TYPE
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
 
-local print = util.print
 local println = util.println
-local print_ts = util.print_ts
-local println_ts = util.println_ts
 
 local PERIODICS = {
     KEEP_ALIVE = 2000
@@ -50,7 +47,7 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
         seq_num = 0,
         r_seq_num = nil,
         connected = true,
-        rtu_conn_watchdog = util.new_watchdog(timeout),
+        conn_watchdog = util.new_watchdog(timeout),
         last_rtt = 0,
         -- periodic messages
         periodics = {
@@ -78,9 +75,7 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
         end
 
         for i = 1, #self.advert do
-            local unit     = nil ---@type unit_session|nil
+            local unit = nil    ---@type unit_session|nil
-            local rs_in_q  = nil ---@type mqueue|nil
-            local tbv_in_q = nil ---@type mqueue|nil
 
             ---@type rtu_advertisement
             local unit_advert = {
@@ -123,26 +118,31 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
                 if unit_advert.reactor > 0 then
                     local target_unit = self.fac_units[unit_advert.reactor] ---@type reactor_unit
 
+                    -- unit RTUs
                     if u_type == RTU_UNIT_TYPE.REDSTONE then
                         -- redstone
                         unit = svrs_redstone.new(id, i, unit_advert, self.modbus_q)
                         if type(unit) ~= "nil" then target_unit.add_redstone(unit) end
                     elseif u_type == RTU_UNIT_TYPE.BOILER_VALVE then
-                        -- boiler (Mekanism 10.1+)
+                        -- boiler
                         unit = svrs_boilerv.new(id, i, unit_advert, self.modbus_q)
                         if type(unit) ~= "nil" then target_unit.add_boiler(unit) end
                     elseif u_type == RTU_UNIT_TYPE.TURBINE_VALVE then
-                        -- turbine (Mekanism 10.1+)
+                        -- turbine
                         unit = svrs_turbinev.new(id, i, unit_advert, self.modbus_q)
                         if type(unit) ~= "nil" then target_unit.add_turbine(unit) end
                     elseif u_type == RTU_UNIT_TYPE.ENV_DETECTOR then
                         -- environment detector
                         unit = svrs_envd.new(id, i, unit_advert, self.modbus_q)
                         if type(unit) ~= "nil" then target_unit.add_envd(unit) end
+                    elseif u_type == RTU_UNIT_TYPE.VIRTUAL then
+                        -- skip virtual units
+                        log.debug(util.c(log_header, "skipping virtual RTU unit #", i))
                     else
                         log.error(util.c(log_header, "bad advertisement: encountered unsupported reactor-specific RTU type ", type_string))
                     end
                 else
+                    -- facility RTUs
                     if u_type == RTU_UNIT_TYPE.REDSTONE then
                         -- redstone
                         unit = svrs_redstone.new(id, i, unit_advert, self.modbus_q)
@@ -161,6 +161,9 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
                         -- environment detector
                         unit = svrs_envd.new(id, i, unit_advert, self.modbus_q)
                         if type(unit) ~= "nil" then facility.add_envd(unit) end
+                    elseif u_type == RTU_UNIT_TYPE.VIRTUAL then
+                        -- skip virtual units
+                        log.debug(util.c(log_header, "skipping virtual RTU unit #", i))
                     else
                         log.error(util.c(log_header, "bad advertisement: encountered unsupported reactor-independent RTU type ", type_string))
                     end
@@ -168,8 +171,8 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
             end
 
             if unit ~= nil then
-                table.insert(self.units, unit)
+                self.units[i] = unit
-            else
+            elseif u_type ~= RTU_UNIT_TYPE.VIRTUAL then
                 _reset_config()
                 log.error(util.c(log_header, "bad advertisement: error occured while creating a unit (type is ", type_string, ")"))
                 break
@@ -179,13 +182,11 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
 
     -- mark this RTU session as closed, stop watchdog
     local function _close()
-        self.rtu_conn_watchdog.cancel()
+        self.conn_watchdog.cancel()
         self.connected = false
 
         -- mark all RTU unit sessions as closed so the reactor unit knows
-        for i = 1, #self.units do
+        for _, unit in pairs(self.units) do unit.close() end
-            self.units[i].close()
-        end
     end
 
     -- send a MODBUS packet
@@ -219,7 +220,7 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
         -- check sequence number
         if self.r_seq_num == nil then
             self.r_seq_num = pkt.scada_frame.seq_num()
-        elseif self.r_seq_num >= pkt.scada_frame.seq_num() then
+        elseif (self.r_seq_num + 1) ~= pkt.scada_frame.seq_num() then
             log.warning(log_header .. "sequence out-of-order: last = " .. self.r_seq_num .. ", new = " .. pkt.scada_frame.seq_num())
             return
         else
@@ -227,22 +228,23 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
         end
 
         -- feed watchdog
-        self.rtu_conn_watchdog.feed()
+        self.conn_watchdog.feed()
 
         -- process packet
         if pkt.scada_frame.protocol() == PROTOCOL.MODBUS_TCP then
+            ---@cast pkt modbus_frame
             if self.units[pkt.unit_id] ~= nil then
                 local unit = self.units[pkt.unit_id]    ---@type unit_session
----@diagnostic disable-next-line: param-type-mismatch
                 unit.handle_packet(pkt)
             end
         elseif pkt.scada_frame.protocol() == PROTOCOL.SCADA_MGMT then
+            ---@cast pkt mgmt_frame
             -- handle management packet
             if pkt.type == SCADA_MGMT_TYPE.KEEP_ALIVE then
                 -- keep alive reply
                 if pkt.length == 2 then
                     local srv_start = pkt.data[1]
-                    local rtu_send = pkt.data[2]
+                    -- local rtu_send = pkt.data[2]
                     local srv_now = util.time()
                     self.last_rtt = srv_now - srv_start
 
@@ -290,7 +292,7 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
     ---@nodiscard
     ---@param timer number
     function public.check_wd(timer)
-        return self.rtu_conn_watchdog.is_timer(timer) and self.connected
+        return self.conn_watchdog.is_timer(timer) and self.connected
     end
 
     -- close the connection
@@ -347,9 +349,7 @@ function rtu.new_session(id, in_queue, out_queue, timeout, advertisement, facili
 
             local time_now = util.time()
 
-            for i = 1, #self.units do
+            for _, unit in pairs(self.units) do unit.update(time_now) end
-                self.units[i].update(time_now)
-            end
 
             ----------------------
             -- update periodics --

supervisor/session/rtu/redstone.lua

@@ -12,7 +12,6 @@ local MODBUS_FCODE = types.MODBUS_FCODE
 
 local IO_PORT = rsio.IO
 local IO_LVL = rsio.IO_LVL
-local IO_DIR = rsio.IO_DIR
 local IO_MODE = rsio.IO_MODE
 
 local TXN_READY = -1
@@ -121,8 +120,7 @@ function redstone.new(session_id, unit_id, advert, out_queue)
                 local io_f = {
                     ---@nodiscard
                     read = function () return rsio.digital_is_active(port, self.phy_io.digital_in[port].phy) end,
-                    ---@param active boolean
+                    write = function () end
-                    write = function (active) end
                 }
 
                 self.db.io[port] = io_f
@@ -155,8 +153,7 @@ function redstone.new(session_id, unit_id, advert, out_queue)
                     ---@nodiscard
                     ---@return integer
                     read = function () return self.phy_io.analog_in[port].phy end,
-                    ---@param value integer
+                    write = function () end
-                    write = function (value) end
                 }
 
                 self.db.io[port] = io_f