Bug(FB): IndexError on model 570000ZF - compact message format not handled

[DyllyTheSylly]

HA core version

2025.12.2

Intergration version

0.6.10

Device type and model

Electric Heater 570000ZF (0)

Used App

Home Assistant

The description of problem

Device Info

• Model: 570000ZF (Electric Heater)
• Device Type: FB
• Integration Version: [check your version]
• Home Assistant Version: 2025.x.x

Problem

The FB device message parser crashes with IndexError: bytearray index out of range when processing messages from this heater model.

Root Cause

The parser assumes all FB devices send 14+ byte message bodies (to read body[13]), but this model sends compact 6-byte messages.

Error Messages

[Paste your 4 error messages from the log]

Message Examples

• aa12fb0000000000020404a41000070200002c (6-byte body)
• aa12fb0000000000020404a51000070100002c (6-byte body)

Proposed Fix

Add length check in message.py line 157:

if len(body) >= 14:
    self.current_temperature = body[13] - 20
else:
    self.current_temperature = None

Additional Context

Oscillation control is available in the Midea app but not exposed in HA. Byte 4/5 of the compact message format may contain oscillation state.

The logs

s6-rc: info: service s6rc-oneshot-runner: starting
s6-rc: info: service s6rc-oneshot-runner successfully started
s6-rc: info: service fix-attrs: starting
s6-rc: info: service fix-attrs successfully started
s6-rc: info: service legacy-cont-init: starting
s6-rc: info: service legacy-cont-init successfully started
s6-rc: info: service legacy-services: starting
services-up: info: copying legacy longrun home-assistant (no readiness notification)
s6-rc: info: service legacy-services successfully started
2025-12-10 14:12:55.791 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration ble_monitor which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.796 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration midea_ac_lan which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.800 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration meross_lan which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.803 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration alexa_media which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.806 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration tplink_router which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.809 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration goveelife which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.813 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration hacs which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.815 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration ble_monitor which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.818 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration midea_ac_lan which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.820 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration meross_lan which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.823 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration alexa_media which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.826 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration tplink_router which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.828 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration goveelife which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:12:55.831 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration hacs which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2025-12-10 14:13:13.963 ERROR (MainThread) [homeassistant.components.panel_custom] Unable to register panel Supervisor: Overwriting panel hassio
2025-12-10 14:13:38.360 ERROR (MainThread) [simplipy] Unknown device type: 21
2025-12-10 14:13:54.309 ERROR (MainThread) [homeassistant.helpers.event] Error while processing template: Template<template=({{ states('input_text.dyly_book_pro_charging') | int }}) renders=2>
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/template/init.py", line 461, in async_render
render_result = render_with_context(self.template, compiled, **kwargs)
File "/usr/src/homeassistant/homeassistant/helpers/template/context.py", line 45, in render_with_context
return template.render(**kwargs)
~~~~~~~~~~~~~~~^^^^^^^^^^
File "/usr/local/lib/python3.13/site-packages/jinja2/environment.py", line 1295, in render
self.environment.handle_exception()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.13/site-packages/jinja2/environment.py", line 942, in handle_exception
raise rewrite_traceback_stack(source=source)
File "", line 1, in top-level template code
File "/usr/src/homeassistant/homeassistant/helpers/template/init.py", line 1570, in forgiving_int_filter
raise_no_default("int", value)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/helpers/template/helpers.py", line 24, in raise_no_default
raise ValueError(
...<2 lines>...
)
ValueError: Template error: int got invalid input 'unknown' when rendering template '{{ states('input_text.dyly_book_pro_charging') | int }}' but no default was specified

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/template/init.py", line 579, in async_render_to_info
render_info._result = self.async_render( # noqa: SLF001
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
variables, strict=strict, log_fn=log_fn, **kwargs
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/usr/src/homeassistant/homeassistant/helpers/template/init.py", line 463, in async_render
raise TemplateError(err) from err
homeassistant.exceptions.TemplateError: ValueError: Template error: int got invalid input 'unknown' when rendering template '{{ states('input_text.dyly_book_pro_charging') | int }}' but no default was specified
2025-12-10 14:13:54.329 ERROR (MainThread) [homeassistant.components.template.template_entity] TemplateError('ValueError: Template error: int got invalid input 'unknown' when rendering template '{{ states('input_text.dyly_book_pro_charging') | int }}' but no default was specified') while processing template 'Template<template=({{ states('input_text.dyly_book_pro_charging') | int }}) renders=4>' for attribute '_attr_native_value' in entity 'sensor.dyly_book_pro_battery_level'
2025-12-10 14:13:56.166 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.spotify does not support any media_player features
2025-12-10 14:13:56.305 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.spotify does not support any media_player features
2025-12-10 14:13:56.314 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_plex_for_ios_iphone does not support any media_player features
2025-12-10 14:13:56.315 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_plex_for_roku_roku_bae does not support any media_player features
2025-12-10 14:13:56.315 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_plex_for_ios_ipad does not support any media_player features
2025-12-10 14:13:56.315 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_plex_web_chrome_osx does not support any media_player features
2025-12-10 14:13:56.316 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_plex_web_chrome_osx_2 does not support any media_player features
2025-12-10 14:13:56.316 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_plex_for_roku_roku_boo does not support any media_player features
2025-12-10 14:13:56.316 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_joshua_g57_plex_for_android_tv_aftkm does not support any media_player features
2025-12-10 14:13:56.316 ERROR (MainThread) [homeassistant.components.homekit.util] media_player.plex_plex_for_ios_ipad_2 does not support any media_player features
2025-12-10 14:18:39.007 WARNING (MainThread) [homeassistant.components.websocket_api.http.connection] [281472441525536] Dylan ha-Bbore from 127.0.0.1 (Home Assistant/2025.11.2 (io.robbie.HomeAssistant; build:2025.1537; macOS 26.1.0)): Disconnected: Received error message during command phase: No PONG received after 27.5 seconds
2025-12-10 14:19:03.074 ERROR (Space Heater) [midealocal.device] [151732605888844] Error in process message aa12fb0000000000020404a41000070200002c, model 570000ZF, subtype 0, device protocol 3, message procol 2
Traceback (most recent call last):
File "/usr/local/lib/python3.13/site-packages/midealocal/device.py", line 491, in parse_message
status = self.process_message(bytes(decrypted))
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/init.py", line 87, in process_message
message = MessageFBResponse(msg)
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 175, in init
self.set_body(FBGeneralMessageBody(super().body))
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 157, in init
self.current_temperature = body[13] - 20
~~~~^^^^
IndexError: bytearray index out of range
2025-12-10 14:19:09.262 ERROR (Space Heater) [midealocal.device] [151732605888844] Error in process message aa12fb0000000000020404a51000070100002c, model 570000ZF, subtype 0, device protocol 3, message procol 2
Traceback (most recent call last):
File "/usr/local/lib/python3.13/site-packages/midealocal/device.py", line 491, in parse_message
status = self.process_message(bytes(decrypted))
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/init.py", line 87, in process_message
message = MessageFBResponse(msg)
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 175, in init
self.set_body(FBGeneralMessageBody(super().body))
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 157, in init
self.current_temperature = body[13] - 20
~~~~^^^^
IndexError: bytearray index out of range
2025-12-10 14:19:13.766 ERROR (Space Heater) [midealocal.device] [151732605888844] Error in process message aa12fb0000000000020404a710000706000025, model 570000ZF, subtype 0, device protocol 3, message procol 2
Traceback (most recent call last):
File "/usr/local/lib/python3.13/site-packages/midealocal/device.py", line 491, in parse_message
status = self.process_message(bytes(decrypted))
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/init.py", line 87, in process_message
message = MessageFBResponse(msg)
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 175, in init
self.set_body(FBGeneralMessageBody(super().body))
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 157, in init
self.current_temperature = body[13] - 20
~~~~^^^^
IndexError: bytearray index out of range
2025-12-10 14:19:15.771 ERROR (Space Heater) [midealocal.device] [151732605888844] Error in process message aa12fb0000000000020404a81000070000002a, model 570000ZF, subtype 0, device protocol 3, message procol 2
Traceback (most recent call last):
File "/usr/local/lib/python3.13/site-packages/midealocal/device.py", line 491, in parse_message
status = self.process_message(bytes(decrypted))
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/init.py", line 87, in process_message
message = MessageFBResponse(msg)
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 175, in init
self.set_body(FBGeneralMessageBody(super().body))
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/local/lib/python3.13/site-packages/midealocal/devices/fb/message.py", line 157, in init
self.current_temperature = body[13] - 20
~~~~^^^^
IndexError: bytearray index out of range
2025-12-10 14:20:33.005 WARNING (MainThread) [homeassistant.components.websocket_api.http.connection] [281473178548032] Dylan ha-Bbore from 127.0.0.1 (Home Assistant/2025.11.2 (io.robbie.HomeAssistant; build:2025.1537; macOS 26.1.0)): Disconnected: Received error message during command phase: No PONG received after 27.5 seconds