Detect MAC addresses over local wifi connection

As I’m starting to use Cayenne (RPi3) to use as a home automation system (before I was using PLC), this “geofencing” idea is just great! At this moment I have a 3 level self made security system, depending on the range away from my home (level 1 warning = x meters from my home, etc.). We need to disable or enable the alarm system every time by our self’s.
Would be a great feature to create a secured (friend) list of mobile phones to automate the security system.

Any idea of this is feasible to program?

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