Update entity state when ZHA device becomes available

[dmulcahey]

This PR causes the entities created by zha to get updated when the associated zigbee device becomes available on the network.

[MartinHjelmare]

What are the reasons for keeping the device entity around? Could it be replaced with a couple of sensors and binary sensors?

[dmulcahey]

@MartinHjelmare no, we’ll end up with duplicates that way. They’re being used currently to deduplicate battery sensors.

[MartinHjelmare]

But why can't it be part of the sensor and binary sensor platforms? Can't we just do the same deduplication there?

[dmulcahey]

Can that be something that is addressed in the future? I can explore doing that but I’d like to do it after this wave of changes

[MartinHjelmare]

Sure, but if we introduce new features now that we plan to break soon, we should think about not doing that, I think.

[dmulcahey]

Agreed... this functionality is technically already there. This just tweaks the existing functionality to ensure it functions as it was designed

[MartinHjelmare]

Ok. 👍

[dmulcahey]

@MartinHjelmare all set