The WHOOP records all night and uploads nothing until you ask. Here's what's actually in that buffer, the field map that everyone — me included — got slightly wrong, and the

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

How a Raspberry Pi, two Nordic dongles, and a carefully-timed Bluetooth toggle revealed a protocol variant that no public documentation mentions. The WHOOP is a fascinating device to reverse-engineer because 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 just tells you how it works, and

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