luacheck fixes

coordinator/coordinator.lua

@@ -1,6 +1,5 @@
 local comms       = require("scada-common.comms")
 local log         = require("scada-common.log")
-local ppm         = require("scada-common.ppm")
 local util        = require("scada-common.util")
 local types       = require("scada-common.types")
 
@@ -252,15 +251,15 @@ function coordinator.comms(version, nic, wl_nic, sv_watchdog)
     local public = {}
 
     -- switch the current active NIC
-    ---@param _nic nic
-    function public.switch_nic(_nic)
+    ---@param act_nic nic
+    function public.switch_nic(act_nic)
         nic.closeAll()
 
         -- configure receive channels
-        _nic.closeAll()
-        _nic.open(config.CRD_Channel)
+        act_nic.closeAll()
+        act_nic.open(config.CRD_Channel)
 
-        nic = _nic
+        nic = act_nic
     end
 
     -- try to connect to the supervisor if not already linked

coordinator/startup.lua

@@ -116,7 +116,8 @@ if not disp_ok then
             disp_ok, disp_err = backplane.init_displays(config)
 
             if not disp_ok then
-                println("monitor configuration invalid, please reconfigure")
+                println(disp_err)
+                println("please reconfigure")
                 return
             end
         end

reactor-plc/plc.lua

@@ -833,15 +833,15 @@ function plc.comms(version, nic, reactor, rps, conn_watchdog)
     local public = {}
 
     -- switch the current active NIC
-    ---@param _nic nic
-    function public.switch_nic(_nic)
+    ---@param act_nic nic
+    function public.switch_nic(act_nic)
         nic.closeAll()
 
         -- configure receive channels
-        _nic.closeAll()
-        _nic.open(config.PLC_Channel)
+        act_nic.closeAll()
+        act_nic.open(config.PLC_Channel)
 
-        nic = _nic
+        nic = act_nic
     end
 
     -- reconnect a newly connected reactor

rtu/rtu.lua

@@ -362,15 +362,15 @@ function rtu.comms(version, nic, conn_watchdog)
     local public = {}
 
     -- switch the current active NIC
-    ---@param _nic nic
-    function public.switch_nic(_nic)
+    ---@param act_nic nic
+    function public.switch_nic(act_nic)
         nic.closeAll()
 
         -- configure receive channels
-        _nic.closeAll()
-        _nic.open(config.RTU_Channel)
+        act_nic.closeAll()
+        act_nic.open(config.RTU_Channel)
 
-        nic = _nic
+        nic = act_nic
     end
 
     -- unlink from the server

rtu/startup.lua

@@ -94,7 +94,7 @@ local function main()
         },
 
         -- system objects
-        ---@class rtu_sys 
+        ---@class rtu_sys
         rtu_sys = {
             rtu_comms = nil,     ---@type rtu_comms
             conn_watchdog = nil, ---@type watchdog