Fascinating, I've done exactly this! I based mine on a collection of ESP8266 modules talking to again, a Flask app. They'd watch for both DHCP broadcast packet

Fascinating, I've done exactly this! I based mine on a collection of ESP8266 modules talking to again, a Flask app. They'd watch for both DHCP broadcast packets and also the visibility of the device on it's own radio. It also would regularly try to ping known devices to track "sessions". What plans do you have, what tech are you using, and where can I follow along?