The WHOOP records all night and stores in in a buffer until requested. Here's what's actually in that buffer, the field map that I misunderstood, and the command that

Six nights, 356,000 records, thirteen algorithm variants, and a surprisingly honest answer from the data. In the previous posts I documented the WHOOP's proprietary BLE protocol, built a passive daemon

How a Raspberry Pi, two Nordic dongles, and a carefully-timed Bluetooth toggle revealed an undocumented protocol variant. The WHOOP is a fascinating device to reverse-engineer because it almost looks open. It

After a chest strap that leaked its ECG by accident and a band that hid everything behind one undocumented byte, here's the device that comes with a manual, and what I

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