There is a Light State Machine PR that has not yet been merged into OH Core. Currently the HomeKit binding is a reference implementation of this state machine by incorporating a copy of the code. However once the OH Core PR will have been merged into OH Core, the copy of the code should be removed from the HomeKit binding.

openhab/openhab-core#4995

Signed-off-by: Andrew Fiddian-Green software@whitebear.ch