I am sharing my finding, maybe someone find it useful.
After upgrading to z2m v 1.31.0 my home assistant log started to log following error:
Exception in message_received when handling msg on 'zigbee2mqtt/0x5c0272fffedd2137': '{"child_lock":null,"current_heating_setpoint":21,"deadzone_temperature":null,"heat":"OFF","last_seen":"2023-06-07T17:42:17+02:00","linkquality":163,"local_temperature":23,"local_temperature_calibration":null,"max_temperature_limit":null,"min_temperature_limit":null,"preset":"hold","preset_mode":"hold","program":null,"running_state":"idle","sensor":null,"system_mode":"off"}' Traceback (most recent call last): File "/srv/hass311/lib/python3.11/site-packages/homeassistant/components/mqtt/debug_info.py", line 44, in wrapper msg_callback(msg) File "/srv/hass311/lib/python3.11/site-packages/homeassistant/components/mqtt/sensor.py", line 321, in message_received _update_state(msg) File "/srv/hass311/lib/python3.11/site-packages/homeassistant/components/mqtt/sensor.py", line 272, in _update_state payload = self._template(msg.payload, PayloadSentinel.DEFAULT) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/srv/hass311/lib/python3.11/site-packages/homeassistant/components/mqtt/models.py", line 251, in async_render_with_possible_json_value rendered_payload = self._value_template.async_render_with_possible_json_value( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/srv/hass311/lib/python3.11/site-packages/homeassistant/helpers/template.py", line 716, in async_render_with_possible_json_value return _render_with_context(self.template, compiled, **variables).strip() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/srv/hass311/lib/python3.11/site-packages/homeassistant/helpers/template.py", line 2164, in _render_with_context return template.render(**kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^ File "/srv/hass311/lib/python3.11/site-packages/jinja2/environment.py", line 1301, in render self.environment.handle_exception() File "/srv/hass311/lib/python3.11/site-packages/jinja2/environment.py", line 936, in handle_exception raise rewrite_traceback_stack(source=source) File "<template>", line 1, in top-level template code File "/srv/hass311/lib/python3.11/site-packages/jinja2/filters.py", line 870, in do_truncate if len(s) <= length + leeway: ^^^^^^ TypeError: object of type 'NoneType' has no len()
Upgrading to 1.31.1 didn’t help.
Then I find out that program sensor in home assistant config device is unknown. Previously this sensor showed thermostat’s program choosed.
I disabled this sensor and entries in log stopped comming.
Obviously, in 1.31.0 structure of message is changed and this somehow results with this problem.
