* Add simple battery sensor
* Add test for battery sensor based on a real device
* Vary icon based on battery state
* Add test for battery sensory
* Read other battery related states from accessory
* Add a device class to the battery sensor
* Respect the low battery flag from the device
* Start preparing for homekit_controller config entries
* Review feedback
* Review feedback
* Only use the vol.strip validator for pairing_code
* CV not required now
* Changes from review
* Changes after review