Somewhere deep on my todo list is building a grid of ESP32s around the place reporting BLE signal strengths to a central node which can then do triangulation to

Somewhere deep on my todo list is building a grid of ESP32s around the place reporting BLE signal strengths to a central node which can then do triangulation to work out where people are based on devices they typically carry with them (I for example am almost always wearing an Apple Watch, and carrying my phone).