COVID-19 sparked initiatives to digitalize contact tracing. Apple and Google, among others, proposed the use of Bluetooth Low Energy (BLE) beacons through mobile phone apps. This project is an exploration of BLE.
At the center is a sensor. Circles indicate BLE ADV_NONCONN_IND beacons the sensor received from surrounding devices. The distance from the center is an (extremely rough) approximation based on the beacon's signal strength. The size of the circle indicates the size of transmitted data. More information here.
If you do not see any data, the sensor might be restarting, or it was powered off to save energy and bandwidth consumption.
©2020 Claudio "nex" Guarnieri.