#184 WIP supervisor front panel

supervisor/databus.lua

@@ -0,0 +1,44 @@
+--
+-- Data Bus - Central Communication Linking for Supervisor Front Panel
+--
+
+local psil = require("scada-common.psil")
+
+local databus = {}
+
+local dbus_iface = {
+    ps = psil.create(),
+    session_entries = { rtu = {}, plc = {}, coord = {}, diag = {} }
+}
+
+-- call to toggle heartbeat signal
+function databus.heartbeat() dbus_iface.ps.toggle("heartbeat") end
+
+-- transmit firmware versions across the bus
+---@param plc_v string supervisor version
+---@param comms_v string comms version
+function databus.tx_versions(plc_v, comms_v)
+    dbus_iface.ps.publish("version", plc_v)
+    dbus_iface.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)
+    dbus_iface.ps.publish("has_modem", has_modem)
+end
+
+function databus.tx_svs_connection(type, data)
+end
+
+function databus.tx_svs_disconnection(type, data)
+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)
+    dbus_iface.ps.subscribe(field, func)
+end
+
+return databus