Academic framework for tracking personal BLE devices via Apple's Find My network (~13k stars, AGPL-3.0). It ships ESP32 (and nRF51822) firmware that advertises as a Find My beacon, so an ESP32 can act as a DIY 'AirTag' — the AirTag/Find-My beacon spoof/emulation path on cheap hardware. Authorised research only; covertly placing a Find My beacon to track a person is unlawful.