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local proto = Proto("t937", "T-937/M Serial Control")
local FUN_TABLE = {
[0x01] = "O_CONNECT",
[0x02] = "O_TEMPS",
[0x03] = "O_READ",
[0x06] = "O_ACK_WRITE",
[0x08] = "C_SET_HEAT",
[0x0d] = "C_SET_COOL",
[0x10] = "C_STARTSTOP",
[0x11] = "C_REQ_READ",
[0x20] = "C_WRITE",
[0xf1] = "C_ACK_CONNECT",
[0xf2] = "C_ACK_READ",
}
proto.experts.checksum = ProtoExpert.new("t937.checksum",
"T937 Checksum Error",
expert.group.CHECKSUM, expert.severity.ERROR
)
proto.fields.addr = ProtoField.uint16("t937.address", "Address", base.HEX)
proto.fields.fun = ProtoField.uint8("t937.function", "Function", base.HEX, FUN_TABLE)
proto.fields.len = ProtoField.uint8("t937.length", "Data Length", base.DEC)
proto.fields.checksum = ProtoField.uint16("t937.checksum", "Message Checksum", base.HEX)
proto.fields.conn_status = ProtoField.uint16("t937.conn_status", "Connection Status", base.HEX, {
[0x0100] = "CONNECTING",
[0x0200] = "CONNECTED",
})
proto.fields.temp1 = ProtoField.uint16("t937.temp1", "Chamber Temp 1", base.UNIT_STRING, {"°C"})
proto.fields.temp2 = ProtoField.uint16("t937.temp2", "Chamber Temp 2", base.UNIT_STRING, {"°C"})
proto.fields.temp3 = ProtoField.uint16("t937.temp3", "Control Board Temp", base.UNIT_STRING, {"°C"})
proto.fields.pwm = ProtoField.uint8("t937.pwm", "PWM", base.HEX)
proto.fields.pwm_mode = ProtoField.uint8("t937.pwm_mode", "PWM Mode", base.HEX, {
[0x44] = "ON",
[0x88] = "OFF",
})
proto.fields.profile = ProtoField.uint8("t937.profile_num", "Profile Number", base.DEC)
proto.fields.profile_dur = ProtoField.uint16("t937.profile_dur", "Profile Duration", base.UNIT_STRING, {"s"})
proto.fields.profile_temps = ProtoField.ubytes("t937.profile_temps", "Profile Temperatures")
proto.fields.startstop = ProtoField.uint8("t937.startstop", "Start/Stop", base.HEX, {
[0x11] = "START",
[0x22] = "STOP",
})
proto.fields.data = ProtoField.bytes("t937.data", "Raw Data")
local function try_dissect(bytes, pinfo, tree)
-- minimum len is header + checksum
if bytes:len() < 4 + 2 then return end
local raw_len = bytes:uint(3, 1)
if bytes:len() < 4 + raw_len + 2 then return end
local buffer = bytes:subset(0, 4+raw_len+2):tvb("T-937 Frame")
local sub = tree:add(proto, buffer())
local i = 0
sub:add_packet_field(proto.fields.addr, buffer(0, 2), ENC_BIG_ENDIAN)
local funf, fun, i = sub:add_packet_field(proto.fields.fun, buffer(2, 1), ENC_BIG_ENDIAN)
sub:add_packet_field(proto.fields.len, buffer(3, 1), ENC_BIG_ENDIAN)
local data = buffer(4, raw_len)
sub:add_packet_field(proto.fields.data, data, ENC_BIG_ENDIAN)
local csf, cs = sub:add_packet_field(proto.fields.checksum, buffer(4+raw_len), ENC_BIG_ENDIAN)
local sum = 0
for i=0,4+raw_len-1 do
sum = sum + buffer(i, 1):uint()
end
if sum ~= cs then
csf:add_proto_expert_info(proto.experts.checksum, string.format(
"expected 0x%04x, got 0x%04x", cs, sum
))
end
local fun_name = FUN_TABLE[fun]
pinfo.cols.info:set("T937 " .. (fun_name or ""))
if fun_name then
sub = sub:add(data, fun_name)
end
if fun_name == "O_CONNECT"
or fun_name == "C_ACK_CONNECT" then
sub:add(proto.fields.conn_status, data())
elseif fun_name == "O_TEMPS" then
sub:add(proto.fields.temp1, data(0,2))
sub:add(proto.fields.temp2, data(2,2))
sub:add(proto.fields.temp3, data(4,2))
elseif fun_name == "C_PWM_HEAT"
or fun_name == "C_PWM_COOL" then
sub:add(proto.fields.pwm, data(0,1))
sub:add(proto.fields.pwm_mode, data(1,1))
elseif fun_name == "C_STARTSTOP"
or fun_name == "C_REQ_READ" then
sub:add(proto.fields.profile, data(0,1), data(0,1):uint()+1)
sub:add(proto.fields.startstop, data(1,1))
elseif fun_name == "C_WRITE"
or fun_name == "O_READ" then
local len = data(0,2):uint() * 3
sub:add(proto.fields.profile, data(2,1), data(2,1):uint()+1)
sub:add(proto.fields.profile_dur, data(9,2), len)
sub:add(proto.fields.profile_temps, data(4,2))
end
return buffer:len()
end
local state
function proto.init()
state = {
error = {},
rest = {
[P2P_DIR_SENT] = ByteArray.new(),
[P2P_DIR_RECV] = ByteArray.new(),
},
buffers = {},
last_number = -1,
}
end
function proto.dissector(_buf, pinfo, tree)
local buffers = state.buffers[pinfo.number]
if buffers then
for _,buffer in ipairs(buffers) do
try_dissect(buffer, pinfo, tree)
end
return true
end
local err = state.error[pinfo.p2p_dir]
if err then
if state.last_number == pinfo.number then
error(err)
else
return
end
end
if state.last_number >= pinfo.number then
error(string.format(
"dissection order not increasing: %d >= %d",
state.last_number, pinfo.number
))
end
local rest = state.rest[pinfo.p2p_dir]
rest:append(_buf:bytes())
buffers = {}
while rest:len() > 0 do
local ok, len = pcall(try_dissect, rest, pinfo, tree)
if not ok then
state.error[pinfo.p2p_dir] = len
state.last_number = pinfo.number
print(len)
error(len)
elseif not len then
break
end
table.insert(buffers, rest:subset(0, len))
if len == rest:len() then
rest = ByteArray.new()
break
end
rest = rest:subset(len, rest:len() - len)
end
state.rest[pinfo.p2p_dir] = rest
state.buffers[pinfo.number] = buffers
state.last_number = pinfo.number
return true
end
pcall(proto.register_heuristic, proto, "ch340.serial_data", proto.dissector)
pcall(proto.register_heuristic, proto, "pl2303.serial_data", proto.dissector)
DissectorTable.get("rtacser.data"):add_for_decode_as(proto)
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