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#41 PLC connection closing

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This commit is contained in:
Mikayla Fischler
2022-05-02 12:06:04 -04:00
parent b280201446
commit 5ce3f84dfa
3 changed files with 64 additions and 12 deletions
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52
reactor-plc/plc.lua
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@@ -197,6 +197,7 @@ end
function comms_init(id, modem, local_port, server_port, reactor, iss)
local self = {
id = id,
open = false,
seq_num = 0,
r_seq_num = nil,
modem = modem,
@@ -218,14 +219,29 @@ function comms_init(id, modem, local_port, server_port, reactor, iss)
-- PRIVATE FUNCTIONS --
local _send = function (msg_type, msg)
local s_pkt = comms.scada_packet()
local r_pkt = comms.rplc_packet()
if self.open then
local s_pkt = comms.scada_packet()
local r_pkt = comms.rplc_packet()
r_pkt.make(self.id, msg_type, msg)
s_pkt.make(self.seq_num, PROTOCOLS.RPLC, r_pkt.raw_sendable())
r_pkt.make(self.id, msg_type, msg)
s_pkt.make(self.seq_num, PROTOCOLS.RPLC, r_pkt.raw_sendable())
self.modem.transmit(self.s_port, self.l_port, s_pkt.raw_sendable())
self.seq_num = self.seq_num + 1
self.modem.transmit(self.s_port, self.l_port, s_pkt.raw_sendable())
self.seq_num = self.seq_num + 1
end
end
local _send_mgmt = function (msg_type, msg)
if self.open then
local s_pkt = comms.scada_packet()
local m_pkt = comms.mgmt_packet()
m_pkt.make(msg_type, msg)
s_pkt.make(self.seq_num, PROTOCOLS.RPLC, m_pkt.raw_sendable())
self.modem.transmit(self.s_port, self.l_port, s_pkt.raw_sendable())
self.seq_num = self.seq_num + 1
end
end
-- variable reactor status information, excluding heating rate
@@ -425,6 +441,9 @@ function comms_init(id, modem, local_port, server_port, reactor, iss)
self.r_seq_num = packet.scada_frame.seq_num()
end
-- mark connection as open
self.open = true
-- feed the watchdog first so it doesn't uhh...eat our packets
conn_watchdog.feed()
@@ -555,19 +574,34 @@ function comms_init(id, modem, local_port, server_port, reactor, iss)
log._debug("discarding non-link packet before linked")
end
elseif packet.scada_frame.protocol() == PROTOCOLS.SCADA_MGMT then
-- @todo
-- handle session close
if packet.type == SCADA_MGMT_TYPES.CLOSE then
self.open = false
conn_watchdog.cancel()
unlink()
else
log._warning("received unknown SCADA_MGMT packet type " .. packet.type)
end
end
end
end
local is_scrammed = function () return self.scrammed end
local is_linked = function () return self.linked end
local is_closed = function () return not self.open end
local unlink = function ()
self.linked = false
self.r_seq_num = nil
end
local close = function ()
self.open = false
conn_watchdog.cancel()
unlink()
_send_mgmt(SCADA_MGMT_TYPES.CLOSE, {})
end
return {
reconnect_modem = reconnect_modem,
reconnect_reactor = reconnect_reactor,
@@ -579,6 +613,8 @@ function comms_init(id, modem, local_port, server_port, reactor, iss)
send_iss_alarm = send_iss_alarm,
is_scrammed = is_scrammed,
is_linked = is_linked,
unlink = unlink
is_closed = is_closed,
unlink = unlink,
close = close
}
end