active-backup supervisor setups are no longer planned

README.md

@@ -1,6 +1,8 @@
 # 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! 
 
+This requires CC: Tweaked and Mekanism v10.0+ (10.1 recommended for full feature set).
+
 
 ## [SCADA](https://en.wikipedia.org/wiki/SCADA)
 > Supervisory control and data acquisition (SCADA) is a control system architecture comprising computers, networked data communications and graphical user interfaces for high-level supervision of machines and processes. It also covers sensors and other devices, such as programmable logic controllers, which interface with process plant or machinery.
@@ -23,7 +25,7 @@ There can only be one of these. This server acts as a hybrid of levels 3 & 4 in
 
 ### Supervisory Computers
 
-There can be at most two of these in an active-backup configuration. If a backup is configured, it will act as a hot backup. This means it will be live, all data will be recieved by both it and the active computer, but it will not be commanding anything unless it hears that the active supervisor is shutting down or loses communication with the active supervisor.
+There should be one of these per facility system. Currently, that means only one. In the future, multiple supervisors would provide the capability of coordinating between multiple facilities (like a fission facility, fusion facility, etc).
 
 ### RTUs
 

scada-common/comms.lua

@@ -1,15 +1,10 @@
 PROTOCOLS = {
     MODBUS_TCP = 0,     -- our "MODBUS TCP"-esque protocol
     RPLC = 1,           -- reactor PLC protocol
-    SCADA_MGMT = 2,     -- SCADA supervisor intercommunication, device advertisements, etc
+    SCADA_MGMT = 2,     -- SCADA supervisor management, device advertisements, etc
     COORD_DATA = 3      -- data packets for coordinators to/from supervisory controller
 }
 
-SCADA_SV_MODES = {
-    ACTIVE = 0,         -- supervisor running as primary
-    BACKUP = 1          -- supervisor running as hot backup
-}
-
 RPLC_TYPES = {
     KEEP_ALIVE = 0,     -- keep alive packets
     LINK_REQ = 1,       -- linking requests

supervisor/config.lua

@@ -1,15 +1,6 @@
--- type ('active','backup')
--- 'active' system carries through instructions and control
--- 'backup' system serves as a hot backup, still recieving data 
---      from all PLCs and coordinator(s) while in backup to allow 
---      instant failover if active goes offline without re-sync
-SYSTEM_TYPE = 'active'
 -- scada network listen for PLC's and RTU's
 SCADA_DEV_LISTEN = 16000
--- failover synchronization
-SCADA_FO_LOCAL = 16101
-SCADA_FO_PEER = 16102
 -- listen port for SCADA supervisor access by coordinators
-SCADA_SV_LISTEN = 16201
+SCADA_SV_LISTEN = 16100
 -- expected number of reactors
 NUM_REACTORS = 4

supervisor/startup.lua

@@ -39,15 +39,8 @@ if modem == nil then
     return
 end
 
--- determine active/backup mode
-local mode = comms.SCADA_SV_MODES.BACKUP
-if config.SYSTEM_TYPE == "active" then
-    mode = comms.SCADA_SV_MODES.ACTIVE
-end
-
 -- start comms, open all channels
-local comms = supervisor.superv_comms(config.NUM_REACTORS, modem, config.SCADA_DEV_LISTEN, config.SCADA_FO_LOCAL, config.SCADA_FO_PEER, 
-    config.SCADA_SV_CHANNEL)
+local comms = supervisor.superv_comms(config.NUM_REACTORS, modem, config.SCADA_DEV_LISTEN, config.SCADA_SV_LISTEN)
 
 -- base loop clock (4Hz, 5 ticks)
 local loop_clock = os.startTimer(0.25)
@@ -96,7 +89,6 @@ while true do
     -- check for termination request
     if event == "terminate" or ppm.should_terminate() then
         log._warning("terminate requested, exiting...")
-        -- @todo: attempt failover, alert hot backup
         break
     end
 end

supervisor/supervisor.lua

@@ -11,16 +11,13 @@ local RTU_ADVERT_TYPES = comms.RTU_ADVERT_TYPES
 local SESSION_TYPE = svsessions.SESSION_TYPE
 
 -- supervisory controller communications
-function superv_comms(mode, num_reactors, modem, dev_listen, fo_local, fo_peer, coord_listen)
+function superv_comms(mode, num_reactors, modem, dev_listen, coord_listen)
     local self = {
         mode = mode,
-        fo_seq_num = 0,
         ln_seq_num = 0,
         num_reactors = num_reactors,
         modem = modem,
         dev_listen = dev_listen,
-        fo_rx = fo_local,
-        fo_tx = fo_peer,
         coord_listen = coord_listen,
         reactor_struct_cache = nil
     }
@@ -32,21 +29,11 @@ function superv_comms(mode, num_reactors, modem, dev_listen, fo_local, fo_peer,
         if not self.modem.isOpen(self.dev_listen) then
             self.modem.open(self.dev_listen)
         end
-        if not self.modem.isOpen(self.fo_rx) then
-            self.modem.open(self.fo_rx)
-        end
         if not self.modem.isOpen(self.coord_listen) then
             self.modem.open(self.coord_listen)
         end
     end
 
-    local _send_fo = function (msg)
-        local packet = comms.scada_packet()
-        packet.make(self.fo_seq_num, PROTOCOLS.SCADA_MGMT, msg)
-        self.modem.transmit(self.fo_tx, self.fo_rx, packet.raw())
-        self.fo_seq_num = self.fo_seq_num + 1
-    end
-
     local _send_plc_linking = function (dest, msg)
         local packet = comms.scada_packet()
         packet.make(self.ln_seq_num, PROTOCOLS.RPLC, msg)
@@ -146,13 +133,6 @@ function superv_comms(mode, num_reactors, modem, dev_listen, fo_local, fo_peer,
                 else
                     log._debug("illegal packet type " .. protocol .. " on device listening channel")
                 end
-            -- failover listening channel
-            elseif receiver == self.fo_rx then
-                if protocol == PROTOCOLS.SCADA_MGMT then
-                    -- SCADA management packet
-                else
-                    log._debug("illegal packet type " .. protocol .. " on failover listening channel")
-                end
             -- coordinator listening channel
             elseif reciever == self.coord_listen then
                 if protocol == PROTOCOLS.SCADA_MGMT then