It’s hard to find a good solutions for presence, after testing with wifi connections and z-wave/kaku remotes i tried it with bluetooth beacon on a keychain. The result is working perfectly.
Install the beacon app (appstore).
Buy a beacon (i use a Tile Pro (2 devices for 60 euro, deliverd in the netherlands within 24hours ;-).
Add the beacon to homey: result
name it to a person and add it to the keychain of this person.
Now you can make a flow when this beacon is in range of homey to set a variable (presence of a person yes/no) (better logic) to yes.
And a flow when it’s out of range to set on no.
Questions, let me know.