AirThings hardware sometimes omits data

[WillCodeForCats]

Describe the bug Sometimes the airthings hardware does not include a given data point in a polling cycle with Home Assistant that it previously has, which causes a key not to be populated and raises an uncaught exception within in Home Assistant. It's relatively uncommon and does not persist long, but it does happen.

To Reproduce Steps to reproduce the behavior:

1) Let an Airthings BLE device run and observe it until it randomly happens.

Additional context Claimed to be a library bug although I don't really think it is, and I believe it could be handled gracefully (and trivially) within HA by a simple try/except when returning native_value for the sensor.

Ref: https://github.com/home-assistant/core/pull/96735

Logs:

Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 229, in _handle_refresh_interval
await self._async_refresh(log_failures=True, scheduled=True)
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 374, in _async_refresh
self.async_update_listeners()
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 164, in async_update_listeners
update_callback()
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 431, in _handle_coordinator_update
self.async_write_ha_state()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 742, in async_write_ha_state
self._async_write_ha_state()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 810, in _async_write_ha_state
state = self._stringify_state(available)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 748, in _stringify_state
if (state := self.state) is None:
^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 478, in state
value = self.native_value
^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/components/airthings_ble/sensor.py", line 186, in native_value
return self.coordinator.data.sensors[self.entity_description.key]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'illuminance'

Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 229, in _handle_refresh_interval
await self._async_refresh(log_failures=True, scheduled=True)
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 374, in _async_refresh
self.async_update_listeners()
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 164, in async_update_listeners
update_callback()
File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 431, in _handle_coordinator_update
self.async_write_ha_state()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 742, in async_write_ha_state
self._async_write_ha_state()
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 810, in _async_write_ha_state
state = self._stringify_state(available)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 748, in _stringify_state
if (state := self.state) is None:
^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 478, in state
value = self.native_value
^^^^^^^^^^^^^^^^^
File "/usr/src/homeassistant/homeassistant/components/airthings_ble/sensor.py", line 186, in native_value
return self.coordinator.data.sensors[self.entity_description.key]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'radon_1day_level'

[vincegio]

Thanks for this issue and the PR you sent to core, sent a reply so we'll keep this issue open until we get an answer from them there :+1:

[WillCodeForCats]

Marked https://github.com/home-assistant/core/pull/96735 as ready, hopefully it will be accepted this time.

[WillCodeForCats]

Closing because this was never a library bug and the PR is stuck facing constant delays in spite of my efforts to quickly address them.