Nice! I started on something similar (project's resting atm). The approach I took was to look for the phone Wi-Fi MAC addresses on the LAN, as in the article. I

Nice! I started on something similar (project's resting atm). The approach I took was to look for the phone Wi-Fi MAC addresses on the LAN, as in the article. In my case I couldn't get logs from the router, so I pinged the IP space 192.168.0.x, which would update the ARP table and then I could check that one. If a host is unreachable, it is removed from the ARP table. I was hoping for something like `ping` but lower, on Wi-fi MAC level, but alas.