Case study

Wellue O2Ring-S: reconstructing the OxyII BLE protocol

A protocol study and Python client reconstruct the OxyII Bluetooth LE link used by the Wellue O2Ring-S T8520 pulse oximeter. It documents GATT characteristics, framing, CRC-8 and commands for device information, live SpO2 and heart rate, and stored-file transfer.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-08
Evidence class: C2 code & docs, no demo or download

Stars: 13
Last commit: 2026-06-22
Language: Python
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: A Wellue O2Ring-S T8520 and a Bluetooth LE connection are required.
Limits: Real-time waveform and PPG sample data have not been decoded or validated; OTA remains unexercised.
License: MIT license.

Cite

BibTeX

@misc{o2ring-s-protocol-case,
  title = {{Wellue O2Ring-S: reconstructing the OxyII BLE protocol}},
  howpublished = {\url{https://github.com/nglessner/o2ring-s-protocol}},
  url = {https://github.com/nglessner/o2ring-s-protocol},
  urldate = {2026-11-08},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/o2ring-s-protocol-case/}}
}

Plain text

Wellue O2Ring-S: reconstructing the OxyII BLE protocol. https://github.com/nglessner/o2ring-s-protocol (accessed 2026-11-08). Awesome REA entry: https://awesomerea.org/resources/o2ring-s-protocol-case/

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Primary sources

README.md GitHub · nglessner/o2ring-s-protocol · Revision 8a1d603