Migrate to native unit of measurement

[tetienne]

Fix #547

See https://developers.home-assistant.io/docs/core/entity/sensor

[iMicknl]

Looks good! However, should you not make changes here as well:

ha-tahoma/custom_components/tahoma/sensor.py

Lines 338 to 349 in d46a4af

	def state(self):
	"""Return the value of the sensor."""
	state = self.device.states.get(self.entity_description.key)
	if not state:
	return None
	# Transform the value with a lambda function
	if hasattr(self.entity_description, "value"):
	return self.entity_description.value(state.value)
	return state.value

[tetienne]

Good question. I will check.

[tetienne]

@iMicknl Ready to be merged.

[dhover]

I've upgraded to 2.7.1 but I still get the error:

Logger: homeassistant.components.sensor
Source: components/sensor/init.py:151
Integration: Sensor (documentation, issues)
First occurred: 1:36:56 PM (1 occurrences)
Last logged: 1:36:56 PM

custom_components.tahoma.sensor is setting 'unit_of_measurement' on an instance of SensorEntityDescription, this is not valid and will be unsupported from Home Assistant 2021.11. Please report it to the custom component author.