Add hvac_action for thermostats

[Macstar1601]

It would be great if you could add the hvac_action to the thermostats so that you can see whether it is heating or cooling. Currently you can't see what the thermostat is doing.

Like this, for example:

https://github.com/albertogeniola/meross-homeassistant/blob/master/custom_components/meross_cloud/climate.py#L20

def hvac_action(self) -> Optional[str]:
if not self._device.is_on():
return HVACAction.OFF
elif self._device.is_heating:
return HVACAction.HEATING
elif self._device.mode == HVACAction.COOLING:
return HVACAction.COOLING
else:
return HVACAction.IDLE

[oliverlinsenmaier]

That would be really good! :)
I wasn't sure what the cause of this is, but this seems to be the problem.
On actions, there should only be "on", "off" and "eco". The mode will be normally set by the free@home system and can't be overwritten. In my system this comes from a binary sensor telling the F@H system in which mode the heat pump is operating. And I don't want to change that (there are already 2 systems involved, I don't want HA interfere with my heating right now).
BTW, this issue is also discussed here:
Current heating action for climate devices #167
Thermostats detected incorrectly with hvac_mode "heat_cool" #146