Shall write it today. Don't know how useful it'll be to people. Plan is to turn on door/hallway (Hue) lights when my phone's mac address shows up after having been gone for 15 mins (I have a low lease duration, which gives better granularity). Then poll a (Hue) motion sensor on the stairs to know when the lights can be turned off.

Shall also have to do some stuff to correlate brightness with time of day.