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#1 PLC does not shut down if failed link, repeatedly tries to maintain link as part of main loop

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This commit is contained in:
Mikayla Fischler 2022-04-02 11:22:44 -04:00
parent 36fb4587a1
commit a77946ce2c
2 changed files with 87 additions and 92 deletions
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134
reactor-plc/plc.lua
View File

@ -1,53 +1,5 @@
-- #REQUIRES comms.lua
function scada_link(plc_comms)
local linked = false
local link_timeout = os.startTimer(5)
plc_comms.send_link_req()
print_ts("sent link request")
repeat
local event, p1, p2, p3, p4, p5 = os.pullEvent()
-- handle event
if event == "timer" and param1 == link_timeout then
-- no response yet
print("...no response");
elseif event == "modem_message" then
-- server response? cancel timeout
if link_timeout ~= nil then
os.cancelTimer(link_timeout)
end
local packet = plc_comms.parse_packet(p1, p2, p3, p4, p5)
if packet then
-- handle response
local response = plc_comms.handle_link(packet)
if response == nil then
print_ts("invalid link response, bad channel?\n")
break
elseif response == comms.RPLC_LINKING.COLLISION then
print_ts("...reactor PLC ID collision (check config), exiting...\n")
break
elseif response == comms.RPLC_LINKING.ALLOW then
print_ts("...linked!\n")
linked = true
plc_comms.send_rs_io_conns()
plc_comms.send_struct()
plc_comms.send_status()
print_ts("sent initial data\n")
else
print_ts("...denied, exiting...\n")
break
end
end
end
until linked
return linked
end
-- Internal Safety System
-- identifies dangerous states and SCRAMs reactor if warranted
-- autonomous from main control
@ -253,7 +205,8 @@ function rplc_comms(id, modem, local_port, server_port, reactor)
s_port = server_port,
l_port = local_port,
reactor = reactor,
status_cache = nil
status_cache = nil,
linked = false
}
-- PRIVATE FUNCTIONS --
@ -342,32 +295,60 @@ function rplc_comms(id, modem, local_port, server_port, reactor)
return pkt
end
-- handle a linking packet
local handle_link = function (packet)
if packet.type == RPLC_TYPES.LINK_REQ then
return packet.data[1] == RPLC_LINKING.ALLOW
else
return nil
end
end
-- handle an RPLC packet
local handle_packet = function (packet)
if packet.type == RPLC_TYPES.KEEP_ALIVE then
-- keep alive request received, nothing to do except feed watchdog
elseif packet.type == RPLC_TYPES.MEK_STRUCT then
-- request for physical structure
send_struct()
elseif packet.type == RPLC_TYPES.RS_IO_CONNS then
-- request for redstone connections
send_rs_io_conns()
elseif packet.type == RPLC_TYPES.RS_IO_GET then
elseif packet.type == RPLC_TYPES.RS_IO_SET then
elseif packet.type == RPLC_TYPES.MEK_SCRAM then
elseif packet.type == RPLC_TYPES.MEK_ENABLE then
elseif packet.type == RPLC_TYPES.MEK_BURN_RATE then
elseif packet.type == RPLC_TYPES.ISS_GET then
elseif packet.type == RPLC_TYPES.ISS_CLEAR then
if packet ~= nil then
if packet.scada_frame.protocol() == PROTOCOLS.RPLC then
if self.linked then
if packet.type == RPLC_TYPES.KEEP_ALIVE then
-- keep alive request received, nothing to do except feed watchdog
elseif packet.type == RPLC_TYPES.LINK_REQ then
-- link request confirmation
log._debug("received link request response after already being linked")
elseif packet.type == RPLC_TYPES.MEK_STRUCT then
-- request for physical structure
send_struct()
elseif packet.type == RPLC_TYPES.RS_IO_CONNS then
-- request for redstone connections
send_rs_io_conns()
elseif packet.type == RPLC_TYPES.RS_IO_GET then
elseif packet.type == RPLC_TYPES.RS_IO_SET then
elseif packet.type == RPLC_TYPES.MEK_SCRAM then
elseif packet.type == RPLC_TYPES.MEK_ENABLE then
elseif packet.type == RPLC_TYPES.MEK_BURN_RATE then
elseif packet.type == RPLC_TYPES.ISS_GET then
elseif packet.type == RPLC_TYPES.ISS_CLEAR then
end
elseif packet.type == RPLC_TYPES.LINK_REQ then
-- link request confirmation
local link_ack = packet.data[1]
if link_ack == RPLC_LINKING.ALLOW then
print_ts("...linked!\n")
log._debug("rplc link request approved")
plc_comms.send_rs_io_conns()
plc_comms.send_struct()
plc_comms.send_status()
log._debug("sent initial status data")
elseif link_ack == RPLC_LINKING.DENY then
print_ts("...denied, retrying...\n")
log._debug("rplc link request denied")
elseif link_ack == RPLC_LINKING.COLLISION then
print_ts("reactor PLC ID collision (check config), retrying...\n")
log._warning("rplc link request collision")
else
print_ts("invalid link response, bad channel? retrying...\n")
log._error("unknown rplc link request response")
end
self.linked = link_ack == RPLC_LINKING.ALLOW
else
log._("discarding non-link packet before linked")
end
elseif packet.scada_frame.protocol() == PROTOCOLS.SCADA_MGMT then
end
end
end
@ -427,12 +408,17 @@ function rplc_comms(id, modem, local_port, server_port, reactor)
_send(sys_status)
end
local linked = function () return self.linked end
local unlink = function () self.linked = false end
return {
parse_packet = parse_packet,
handle_link = handle_link,
handle_packet = handle_packet,
send_link_req = send_link_req,
send_struct = send_struct,
send_status = send_status
send_status = send_status,
linked = linked,
unlink = unlink
}
end

45
reactor-plc/startup.lua
View File

@ -14,13 +14,14 @@ local R_PLC_VERSION = "alpha-v0.1.0"
local print_ts = util.print_ts
print(">> Reactor PLC " .. R_PLC_VERSION .. " <<")
-- mount connected devices
ppm.mount_all()
local reactor = ppm.get_device("fissionReactor")
local modem = ppm.get_device("modem")
print(">> Reactor PLC " .. R_PLC_VERSION .. " <<")
-- we need a reactor and a modem
if reactor == nil then
print("Fission reactor not found, exiting...");
@ -44,19 +45,19 @@ end
local plc_comms = plc.rplc_comms(config.REACTOR_ID, modem, config.LISTEN_PORT, config.SERVER_PORT, reactor)
-- attempt server connection
-- exit application if connection is denied
if ~plc.scada_link(plc_comms) then
return
end
-- comms watchdog, 3 second timeout
local conn_watchdog = watchdog.new_watchdog(3)
-- loop clock (10Hz, 2 ticks)
-- send status updates at 4Hz (every 5 ticks)
local loop_tick = os.startTimer(0.05)
local ticks_to_update = 5
-- send status updates at ~3.33Hz (every 6 server ticks) (every 3 loop ticks)
-- send link requests at 0.5Hz (every 40 server ticks) (every 20 loop ticks)
local UPDATE_TICKS = 3
local LINK_TICKS = 20
-- start by linking
local ticks_to_update = LINK_TICKS
-- runtime variables
local control_state = false
@ -70,13 +71,12 @@ while true do
-- try to scram reactor if it is still connected
if reactor.scram() then
print_ts("[fatal] PLC lost a peripheral: successful SCRAM, now exiting...\n")
print_ts("[fatal] PLC lost a peripheral: successful SCRAM\n")
else
print_ts("[fatal] PLC lost a peripheral: failed SCRAM, now exiting...\n")
print_ts("[fatal] PLC lost a peripheral: failed SCRAM\n")
end
-- send an alarm: plc_comms.send_alarm(ALARMS.PLC_PERI_DC) ?
return
end
-- check safety (SCRAM occurs if tripped)
@ -87,11 +87,20 @@ while true do
-- handle event
if event == "timer" and param1 == loop_tick then
-- basic event tick, send updated data if it is time (4Hz)
-- basic event tick, send updated data if it is time (~3.33Hz)
-- iss was already checked (main reason for this tick rate)
ticks_to_update = ticks_to_update - 1
if ticks_to_update == 0 then
plc_comms.send_status(control_state, iss_tripped)
ticks_to_update = 5
if plc_comms.linked() then
if ticks_to_update <= 0 then
plc_comms.send_status(control_state, iss_tripped)
ticks_to_update = UPDATE_TICKS
end
else
if ticks_to_update <= 0 then
plc_comms.send_link_req()
ticks_to_update = LINK_TICKS
end
end
elseif event == "modem_message" then
-- got a packet
@ -100,9 +109,9 @@ while true do
local packet = plc_comms.parse_packet(p1, p2, p3, p4, p5)
plc_comms.handle_packet(packet)
elseif event == "timer" and param1 == conn_watchdog.get_timer() then
-- haven't heard from server recently? shutdown reactor
plc_comms.unlink()
iss.trip_timeout()
print_ts("[alert] server timeout, reactor disabled\n")
elseif event == "terminate" then