Reverse-engineered BLE protocol reference for the Wellue O2Ring-S (T8520), with a working Python reference implementation.
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Updated
May 2, 2026 - Python
Reverse-engineered BLE protocol reference for the Wellue O2Ring-S (T8520), with a working Python reference implementation.
Reverse engineer the Wellue O2Ring-S T8520 Bluetooth LE protocol to stream live SpO2 data and download stored files without the vendor app.
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