Hacking Bluetooth Sports Tech for Fun and Profit — Part 2: Raw ECG From an £80 Chest Strap

Reverse-engineering the Wahoo TRACKR HR — no documentation, no SDK, no authentication. Just a BLE connection and methodical curiosity. The Wahoo TRACKR HR is a rechargeable chest strap heart rate monitor. It costs around £80, it supports Bluetooth and ANT+, and — as I discovered — it will