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more dissector improvements

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This commit is contained in:
Allen Hill
2026-06-13 11:58:47 -07:00
parent 051d8dbe99
commit 819058c8a0
1 changed files with 202 additions and 58 deletions
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scripts/packet-analysis/avclan_plugin.lua
+202 -58
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@@ -20,9 +20,77 @@
local iebusproto = Proto("iebus", "IEBus protocol")
local f_unicast = ProtoField.bool("iebus.unicast", "Unicast", base.NONE, { [1] = "false", [2] = "true" })
local f_controller_addr = ProtoField.uint16("iebus.controller", "Controller address", base.HEX, nil, 0x0FFF)
local f_peripheral_addr = ProtoField.uint16("iebus.peripheral", "Peripheral address", base.HEX, nil, 0x0FFF)
-- 12-bit IEBus network (bus) addresses. Sourced from the ADDR_* table in
-- GadgetNutt/AVC-LAN-Module-Builder (src/avclan-registers.h).
local known_addresses = {
[0x178] = "NAV_W_CONTROLS",
[0x180] = "AUDIO_ECU",
[0x190] = "AUDIO_HU",
[0x1A0] = "DVD_P",
[0x1B0] = "REAR_TV",
[0x1B4] = "SINGLE_DIN_NAV",
[0x1B8] = "DISPLAY_SW",
[0x1C0] = "REAR_CTRL_SW",
[0x1C2] = "EURO_GW_ECU",
[0x1C4] = "RUSSIA_GW_ECU",
[0x1C6] = "GW_ECU",
[0x1C8] = "FM_MULTI_DISPLAY",
[0x1CC] = "STEERING_SW",
[0x1D0] = "MULTI_CD_DECODER",
[0x1D4] = "DISPLAY",
[0x1D6] = "CLOCK",
[0x1D8] = "FR_CONTROLLED_SW",
[0x1DC] = "NAV_REM_CTRL",
[0x1E0] = "CD_CH_COMMANDER",
[0x1E4] = "CONSOLIDATED_SW",
[0x1E8] = "MD_CH_COMMANDER",
[0x1EC] = "BODY_COMPUTER",
[0x1F0] = "AMP_RADIO_TUNER",
[0x1F2] = "XM_RADIO_TUNER",
[0x1F4] = "RSA",
[0x1F6] = "RSE_M",
[0x1FF] = "BROADCAST",
[0x200] = "NAV_ECU",
[0x210] = "ATIS",
[0x220] = "VICS",
[0x230] = "TV_TUNER",
[0x240] = "HW_CD_CH",
[0x250] = "HW_DVD_CH",
[0x260] = "TEL_INFO_ECU",
[0x280] = "CAMERA_CTRLR",
[0x300] = "RADIO",
[0x320] = "CASSETTE",
[0x330] = "CASSETTE_NO_CH",
[0x340] = "CD_P",
[0x360] = "1DIN_CD_CH",
[0x380] = "MD_P",
[0x3A0] = "MD_CH",
[0x3C0] = "DAT",
[0x3E0] = "DCC",
[0x3F8] = "TEL_ECU",
[0x400] = "EQUALIZER",
[0x440] = "DSP",
[0x480] = "HW_AMP",
[0x500] = "GPS_RECEIVER",
[0x510] = "ATIS_DECODER",
[0x520] = "FM_MULTI_DECODER",
[0x528] = "RADIO_WAVE_BEACON",
[0x52C] = "OPTICAL_BEACON",
[0x540] = "CD_CH",
[0x560] = "MD_CH_2",
[0x580] = "CDROM_CH",
[0x5A0] = "MDROM_CH",
[0x5C0] = "TEL_INFO",
[0x5C8] = "MAYDAY",
[0x600] = "AC_ECU",
[0x680] = "BODY_ECU",
[0xD19] = "TURN_SIGNAL",
[0xFFF] = "BROADCAST",
}
local f_unicast = ProtoField.bool("iebus.unicast", "Unicast", base.NONE, { [1] = "true", [2] = "false" })
local f_controller_addr = ProtoField.uint16("iebus.controller", "Controller address", base.HEX, known_addresses, 0x0FFF)
local f_peripheral_addr = ProtoField.uint16("iebus.peripheral", "Peripheral address", base.HEX, known_addresses, 0x0FFF)
local f_control = ProtoField.uint8("iebus.control", "Control field", base.HEX)
local f_length = ProtoField.uint8("iebus.length", "Data length", base.DEC)
local f_data = ProtoField.bytes("iebus.data", "Frame data", base.SPACE)
@@ -76,6 +144,8 @@ function iebusproto.dissector(buffer, pinfo, tree)
local subtree = tree:add(iebusproto, buffer(), "IEBus frame")
subtree:add(f_unicast, buffer(0,1))
subtree:add(f_controller_addr, buffer(1,2))
subtree:add(f_peripheral_addr, buffer(3,2))
pinfo.cols.src = buffer(1,2):bytes():tohex():sub(2,-1)
pinfo.cols.dst = buffer(3,2):bytes():tohex():sub(2,-1)
@@ -109,20 +179,26 @@ end
local known_devices = {
[0x00] = "LAN",
[0x01] = "COMM_CTRL",
[0x11] = "COMMUNICATION v1",
-- [0x02] = "COM_EXT", -- @GadgetNutt
[0x11] = "COMMUNICATION v1", -- @GadgetNutt reads 0x11 as COM_MASTER
[0x12] = "COMMUNICATION v2",
[0x21] = "SW",
[0x23] = "SW_NAME",
[0x21] = "SW", -- @GadgetNutt reads 0x21 as SW_AUDIO
[0x23] = "SW_NAME", -- @GadgetNutt reads 0x23 as SW_SHIFT
[0x24] = "SW_CONVERTING",
[0x25] = "CMD_SW",
[0x25] = "CMD_SW", -- @GadgetNutt reads 0x25 as SW
[0x31] = "STATUS",
-- 0x32 corroborated by @GadgetNutt (INFO_DISPLAY2); sends status report f1 to STATUS (32 31 f1 00 00) [CQ-TS7471LC_bootup]
[0x32] = "INFO_DISPLAY2",
[0x28] = "BEEP_HU",
[0x29] = "BEEP_SPEAKERS",
[0x34] = "FRONT_PSNG_MONITOR",
-- [0x40] = "TV_TUNER", -- @GadgetNutt
[0x43] = "CD_CHANGER2",
-- [0x50] = "CD_50", [0x52] = "CD_52", -- @GadgetNutt (CD variants, unconfirmed)
[0x55] = "BLUETOOTH_TEL",
[0x56] = "INFO_DRAWING",
[0x58] = "NAV_ECU",
[0x58] = "NAV_ECU", -- @GadgetNutt reads 0x58 as NAV_GPS
-- [0x5A] = "FM_MULTIPLEX_VICS", [0x5B] = "BEACON", -- @GadgetNutt
[0x5C] = "CAMERA",
[0x5D] = "CLIMATE_DRAWING",
[0x5E] = "AUDIO_DRAWING",
@@ -131,9 +207,14 @@ local known_devices = {
[0x61] = "TAPE_DECK",
[0x62] = "CD",
[0x63] = "CD_CHANGER",
-- [0x64] = "MD", [0x65] = "MD_CH", -- @GadgetNutt (MiniDisc)
[0x74] = "AUDIO_AMP",
[0x80] = "GPS",
-- [0x82] = "FM_MULTIPLEX_DATA", [0x83] = "OPTICAL_BEACON", [0x84] = "RADIO_WAVE_BEACON", -- @GadgetNutt
[0x85] = "VOICE_CTRL",
-- [0x9A] = "FM_MULTIPLEX_TUNER", [0xA4] = "??", -- @GadgetNutt (0xA4 also seen in the A4 01 DB heartbeat)
-- 0xc0 corroborated by @GadgetNutt (XM_TUNER, cf. ADDR XM_RADIO_TUNER); exchanges 0xef/0xff with CMD_SW, sends 0xfe to STATUS [douglasheld2-log.pcap]
[0xC0] = "XM_TUNER",
[0xE0] = "CLIMATE_CTRL_DEV",
[0xE5] = "TRIP_INFO",
}
@@ -143,77 +224,104 @@ local f_from_device = ProtoField.uint8("avclan.from_device", "From device", base
local f_to_device = ProtoField.uint8("avclan.to_device", "To device", base.HEX, known_devices)
local f_active_device = ProtoField.uint8("avclan.active_device", "Active device", base.HEX, known_devices)
-- Action conventions:
-- - REQ/RESP pairs differ by 0x10, where the REQ is the lesser
-- - Opposite pairs (e.g. disc up/down, enable/disable, etc.) differ by 0x01, where the "enable" like action is the lesser
-- - Separate pairs are often (but not always) separated by 0x01
local known_actions = {
-- LAN related
[0x01] = "LAN_INIT",
[0x58] = "LAN_INIT_COMPLETE", -- Probably not fully correct label pair (based on values), but seem related functionally/sequentially
-- [0x5f] = "??", -- COMM_CTRL self-broadcast (01 01 5f 00), frequent in douglasheld2-log.pcap [but abnormal traffic]
[0x00] = "LIST_FUNCTIONS_REQ",
[0x10] = "LIST_FUNCTIONS_RESP",
[0x01] = "RESTART_LAN",
-- -- [0x02]/[0x12] REQ/RESP pair, COMM_v2 <-> COMM_CTRL. The 0x12 resp carries a
-- -- device list, so likely a richer enumeration than 0x00/0x10. (0x12 collides
-- -- with the COMMUNICATION v2 device id.) [CQ-TS7471LC_bootup]
-- -- @GadgetNutt corroborates the enumeration reading: 0x02=DEVICES_RESPONSE,
-- -- 0x12=DEVICES_REQUEST ("devices I want to hear"), 0x13=DEVICES_BROADCAST.
-- [0x02] = "??_REQ", -- 12 01 02 [19 00 16 06 19 0d]
-- [0x12] = "??_RESP", -- 01 12 12 60 63 43 64 65 40 32 5e ...
-- [0x13] = "DEVICES_BROADCAST", -- @GadgetNutt: peripheral broadcasts its logical-device list (b <me> 1FF 01 11 13 ...)
[0x08] = "LANCHECK_END_REQ",
[0x18] = "LANCHECK_END_RESP",
[0x0a] = "LANCHECK_SCAN_REQ",
[0x1a] = "LANCHECK_SCAN_RESP",
[0x0c] = "LANCHECK_REQ",
[0x1c] = "LANCHECK_RESP",
-- [0x0d] = "LANCHECK_??_REQ", -- Observed in @marcin's code; no captured examples
-- [0x1d] = "LANCHECK_??_RESP",
[0x20] = "PING_REQ",
[0x30] = "PING_RESP",
-- Used when HU is switching between Radio and CD
[0x43] = "DISABLE_FUNCTION_REQ",
[0x53] = "DISABLE_FUNCTION_RESP",
[0x42] = "ENABLE_FUNCTION_REQ",
[0x52] = "ENABLE_FUNCTION_RESP",
[0x43] = "DISABLE_FUNCTION_REQ",
[0x53] = "DISABLE_FUNCTION_RESP",
[0x45] = "ADVERTISE_FUNCTION",
[0x46] = "GENERAL_QUERY",
[0x78] = "SCREEN_PRESS",
[0x60] = "BEEP",
-- Physical interface
-- Physical actions
[0x50] = "INSERTION",
[0x51] = "EJECTION",
[0x59] = "BACKLIGHT_ADJUST",
[0x60] = "BEEP",
[0x78] = "SCREEN_PRESS",
[0x80] = "EJECT",
-- [0x8e] = "??", -- COMM_v2->CD (12 62 8e, no payload) [CQ-TS7471LC_bootup]
[0x90] = "DISC_UP",
[0x91] = "DISC_DOWN",
[0x9c] = "PWRVOL_KNOB_RIGHTHAND_TURN",
[0x9d] = "PWRVOL_KNOB_LEFTHAND_TURN",
[0x94] = "TRACK_SEEK_UP",
[0x95] = "TRACK_SEEK_DOWN",
[0x98] = "TRACK_FAST_FORWARD",
[0x99] = "TRACK_REWIND",
[0xa6] = "CD_ENABLE_SCAN",
[0xa7] = "CD_DISABLE_SCAN",
[0xa9] = "CD_ENABLE_DISK_SCAN",
[0xaa] = "CD_DISABLE_DISK_SCAN",
[0x9c] = "PWRVOL_KNOB_RIGHTHAND_TURN",
[0x9d] = "PWRVOL_KNOB_LEFTHAND_TURN",
[0x9f] = "TAPE_NOT_READY", -- Uncertain; observed by @marcin
[0xa0] = "CD_ENABLE_REPEAT",
[0xa1] = "CD_DISABLE_REPEAT",
[0xa3] = "CD_ENABLE_DISK_REPEAT",
[0xa4] = "CD_DISABLE_DISK_REPEAT",
[0xa6] = "CD_ENABLE_SCAN",
[0xa7] = "CD_DISABLE_SCAN",
[0xa9] = "CD_ENABLE_DISK_SCAN",
[0xaa] = "CD_DISABLE_DISK_SCAN",
[0xb0] = "CD_ENABLE_RANDOM",
[0xb1] = "CD_DISABLE_RANDOM",
[0xb3] = "CD_ENABLE_DISK_RANDOM",
[0xb4] = "CD_DISABLE_DISK_RANDOM",
[0x9f] = "TAPE_NOT_READY",
-- Info-display / trip-computer functions. @GadgetNutt names these; cluster
-- around TRIP_INFO/INFO_DISPLAY and the A4 01 DB heartbeat. Unconfirmed here.
-- [0xb7] = "STATUS_B7", -- @GadgetNutt
-- [0xd9] = "INFO_D9", -- @GadgetNutt (info display, unidentified)
-- [0xdb] = "AVG_KMH_INFO", -- @GadgetNutt (average km/h)
-- [0xdc] = "INFO_DC", -- @GadgetNutt (unidentified)
-- [0xdd] = "FUEL_RANGE_INFO", -- @GadgetNutt
-- [0xde] = "TRIP_TIME_INFO", -- @GadgetNutt
-- CD functions
-- Events
[0x50] = "INSERTION",
[0x51] = "EJECTION",
-- Peripheral state communication request/response
[0xe0] = "INITIAL_REPORT_REQ",
[0xf0] = "INITIAL_REPORT_RESP",
[0xe2] = "PLAYBACK_REQ",
[0xf2] = "PLAYBACK_RESP",
[0xe4] = "LOADING_REQ",
[0xf4] = "LOADING_RESP",
[0xed] = "TRACK_NAME_REQ",
[0xfd] = "TRACK_NAME_RESP",
-- Requests
[0xe0] = "INITIAL_REPORT_REQUEST",
[0xe2] = "PLAYBACK_REQUEST",
[0xe4] = "LOADING_REQUEST2",
[0xed] = "REQUEST_TRACK_NAME",
-- Numerically goes here, but message length (short) tracks more with a LAN related pair
-- (Also this was observed early in a capture)
-- [0xef] = "??_REQ", -- Observed in broadcast(?) message 190 => 1f1 00 25 c0 ef [douglasheld2-log.pcap]
-- [0xff] = "??_RESP", -- Observed in broadcast(?) message 1f1 => 190 00 c0 25 ff 00 [douglasheld2-log.pcap]
-- Reports
[0xf0] = "INITIAL_REPORT_RESPONSE",
[0xf1] = "STATUS_REPORT",
[0xf2] = "PLAYBACK_REPORT",
[0xf3] = "LOADING_STATUS_REPORT",
[0xf4] = "LOADING_RESPONSE2",
-- Unprompted peripheral state announcements
[0xf1] = "PLAYBACK_STATUS",
[0xf3] = "LOADING_STATUS",
[0xf9] = "REPORT_TOC",
[0xfd] = "REPORT_TRACK_NAME",
-- [0xfe] = "??", -- dev 0xc0->STATUS (c0 31 fe 00), status-announcement-like [douglasheld2-log.pcap]
}
local known_actions_names = invert(known_actions)
@@ -402,6 +510,14 @@ avclanproto.fields = {
local pe_unhandled_msg = ProtoExpert.new("avclan.expert", "Message not decoded",
expert.group.UNDECODED, expert.severity.WARN)
-- Parsed-but-unrecognized header values: the frame structure is understood, only
-- the device/action byte is absent from our lookup tables. NOTE severity (vs the
-- WARN above) keeps these distinct from genuinely undecodable payloads, and the
-- dedicated abbreviations make each independently filterable in Wireshark.
local pe_unknown_device = ProtoExpert.new("avclan.unknown_device.expert", "Unknown device address",
expert.group.UNDECODED, expert.severity.NOTE)
local pe_unknown_action = ProtoExpert.new("avclan.unknown_action.expert", "Unknown action",
expert.group.UNDECODED, expert.severity.NOTE)
-- local pe_lan_check = ProtoExpert.new("avclan.lan.expert", "")
local pe_ping_req = ProtoExpert.new("avclan.ping_req.expert", "Ping request",
expert.group.SEQUENCE, expert.severity.CHAT)
@@ -410,6 +526,8 @@ local pe_ping_resp = ProtoExpert.new("avclan.ping_resp.expert", "Ping response",
avclanproto.experts = {
pe_unhandled_msg,
pe_unknown_device,
pe_unknown_action,
pe_ping_req,
pe_ping_resp,
}
@@ -431,6 +549,27 @@ local function mark_undecoded(tree, range)
tree:add(range, "Undecoded bytes"):add_proto_expert_info(pe_unhandled_msg)
end
-- Add a device-address field (from/to/active), attaching an expert note when the
-- byte isn't a known device so the frame is filterable via
-- `avclan.unknown_device.expert`. Returns the item so callers can chain off it.
local function add_device(tree, field, range)
local item = tree:add(field, range)
if known_devices[range:uint()] == nil then
item:add_proto_expert_info(pe_unknown_device)
end
return item
end
-- Add the action field, attaching an expert note when the byte isn't a known
-- action (filterable via `avclan.unknown_action.expert`). Returns the item.
local function add_action(tree, range)
local item = tree:add(f_action, range)
if known_actions[range:uint()] == nil then
item:add_proto_expert_info(pe_unknown_action)
end
return item
end
-- ---------------------------------------------------------------------------
-- Per-message decoders.
--
@@ -445,7 +584,7 @@ end
-- tone/level control; these codes collide with physical-interface actions, so
-- the CMD_SW -> AUDIO_AMP device pair disambiguates them.
local function decode_cmd_sw(subtree, buffer, offset, to_device)
subtree:add(f_action, buffer(offset+2,1))
add_action(subtree, buffer(offset+2,1))
local action = field_action().value
if to_device == known_devices_names["AUDIO_AMP"] then
local amptree = subtree:add(avclanproto, buffer(offset+2,-1), "Device: Audio amplifier control")
@@ -471,10 +610,10 @@ end
-- COMMUNICATION v1/v2 source.
local function decode_from_comm(subtree, buffer, offset, to_device)
if to_device == known_devices_names["COMM_CTRL"] then
subtree:add(f_action, buffer(offset+2,1))
add_action(subtree, buffer(offset+2,1))
local action = field_action().value
if action == known_actions_names["ADVERTISE_FUNCTION"] then
subtree:add(f_active_device, buffer(offset+3,1))
add_device(subtree, f_active_device, buffer(offset+3,1))
elseif action == known_actions_names["PING_REQ"] then
subtree:add(f_ping_count, buffer(offset+3,1))
subtree:add_proto_expert_info(pe_ping_req, "Ping request " .. buffer(offset+3,1):uint())
@@ -486,7 +625,7 @@ local function decode_from_comm(subtree, buffer, offset, to_device)
-- Control actions addressed to a peripheral rather than COMM_CTRL, e.g.
-- function enable/disable (COMM_v1/v2 -> CD_CHANGER, 0x42/0x43). These
-- are understood apart from a trailing 0x01 of unknown meaning.
subtree:add(f_action, buffer(offset+2,1))
add_action(subtree, buffer(offset+2,1))
end
end
@@ -494,7 +633,7 @@ end
local function decode_from_commctrl(subtree, buffer, offset, to_device)
if to_device == known_devices_names["COMMUNICATION v1"] or
to_device == known_devices_names["COMMUNICATION v2"] then
local action_tree = subtree:add(f_action, buffer(offset+2,1))
local action_tree = add_action(subtree, buffer(offset+2,1))
local action = field_action().value
if action == known_actions_names["PING_RESP"] then
subtree:add(f_ping_count, buffer(offset+3,1))
@@ -515,7 +654,7 @@ local function decode_from_commctrl(subtree, buffer, offset, to_device)
subtree:add_proto_expert_info(pe_unhandled_msg)
end
elseif to_device == known_devices_names["COMM_CTRL"] then
local action_tree = subtree:add(f_action, buffer(offset+2,1))
local action_tree = add_action(subtree, buffer(offset+2,1))
local action = field_action().value
if action == known_actions_names["BACKLIGHT_ADJUST"] then
local backlight = subtree:add(f_backlight, buffer(offset+3,1))
@@ -524,9 +663,9 @@ local function decode_from_commctrl(subtree, buffer, offset, to_device)
elseif to_device == known_actions_names["LANCHECK_SCAN_REQ"] or
to_device == known_actions_names["LANCHECK_REQ"] or
to_device == known_actions_names["LANCHECK_END_REQ"] then
subtree:add(f_action, buffer(offset+1,1))
add_action(subtree, buffer(offset+1,1))
elseif to_device == 0x00 then
subtree:add(f_action, buffer(offset+2,1))
add_action(subtree, buffer(offset+2,1))
else
subtree:add_proto_expert_info(pe_unhandled_msg)
end
@@ -534,7 +673,7 @@ end
-- Beep request (any source -> BEEP_SPEAKERS), action 0x60 with a duration byte.
local function decode_beep(subtree, buffer, offset)
subtree:add(f_action, buffer(offset+2,1))
add_action(subtree, buffer(offset+2,1))
local action = field_action().value
if action == known_actions_names["BEEP"] then
subtree:add(f_beep_duration, buffer(offset+3,1))
@@ -585,8 +724,8 @@ end
-- CD / CD_CHANGER source: payload depends on the report action.
local function decode_cd(subtree, buffer, offset, action)
if action == known_actions_names["STATUS_REPORT"] or
action == known_actions_names["PLAYBACK_REPORT"] then
if action == known_actions_names["PLAYBACK_STATUS"] or
action == known_actions_names["PLAYBACK_RESP"] then
local cdtree = subtree:add(avclanproto, buffer(offset,9), "Device: CD player")
local cd_slots = cdtree:add(f_cd_slots, buffer(offset+3,1))
cd_slots:add(f_cd_slot1, buffer(offset+3,1))
@@ -619,8 +758,8 @@ local function decode_cd(subtree, buffer, offset, action)
cd_flags:add(f_cd_flag_repeat, buffer(offset+9,1))
cd_flags:add(f_cd_flag_disk_scan, buffer(offset+9,1))
cd_flags:add(f_cd_flag_scan, buffer(offset+9,1))
elseif action == known_actions_names["LOADING_STATUS_REPORT"] or
action == known_actions_names["LOADING_RESPONSE2"] then
elseif action == known_actions_names["LOADING_STATUS"] or
action == known_actions_names["LOADING_RESP"] then
local cdtree = subtree:add(avclanproto, buffer(offset,9), "Device: CD player")
local available_slots = cdtree:add(f_cd_slots, buffer(offset+4,1))
available_slots:add(f_cd_slot1, buffer(offset+4,1))
@@ -664,9 +803,9 @@ local function decode_cd(subtree, buffer, offset, action)
end
end
-- TAPE_DECK source: tape state dump on STATUS_REPORT.
-- TAPE_DECK source: tape state dump on PLAYBACK_STATUS
local function decode_tape(subtree, buffer, offset, action)
if action == known_actions_names["STATUS_REPORT"] then
if action == known_actions_names["PLAYBACK_STATUS"] then
local tapetree = subtree:add(avclanproto, buffer(offset,4), "Device: Tape deck")
tapetree:add(f_tape_present, buffer(offset+3,1))
@@ -729,8 +868,8 @@ function avclanproto.dissector(buffer, pinfo, tree)
if buffer(7,1):uint() == 0 then
offset = 8
end
subtree:add(f_from_device, buffer(offset+0,1))
subtree:add(f_to_device, buffer(offset+1,1))
add_device(subtree, f_from_device, buffer(offset+0,1))
add_device(subtree, f_to_device, buffer(offset+1,1))
local from_device = field_from_device().value
local to_device = field_to_device().value
@@ -746,11 +885,16 @@ function avclanproto.dissector(buffer, pinfo, tree)
decode_beep(subtree, buffer, offset)
elseif from_device == known_devices_names["STATUS"] and
known_devices[to_device] ~= nil then
subtree:add(f_action, buffer(offset+2,1))
add_action(subtree, buffer(offset+2,1))
elseif device_decoders[from_device] then
subtree:add(f_action, buffer(offset+2,1))
add_action(subtree, buffer(offset+2,1))
device_decoders[from_device](subtree, buffer, offset, field_action().value)
else
-- Unknown source/dest: the [from, to, action] header layout still holds
-- even when we can't decode the body, so surface the action.
if buffer:len() > offset+2 then
add_action(subtree, buffer(offset+2,1))
end
subtree:add_proto_expert_info(pe_unhandled_msg)
end
end