# garmin-proto-lab: reconstructing Garmin watch communication

> garmin-proto-lab reconstructs Garmin watch-facing GFDI communication in a Python compatibility client using findings from Garmin Connect's Android package. Its specification covers BLE routing, pairing, authentication, MultiLink transport, file access and FIT validation; the author reports offline implementation and tests, with live watch checks remaining.

- Type: Case study
- Targets: App · Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/seofernando25/garmin-proto-lab>
- Primary source: <https://github.com/seofernando25/garmin-proto-lab/blob/e029827ed41c97cfab86eecc7d485291009e56f2/spec/PROTOCOL.md>
- Catalog page: <https://awesomerea.org/resources/garmin-proto-lab-case/>
- Record JSON: <https://awesomerea.org/resources/garmin-proto-lab-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/garmin-proto-lab-case/index.md)

## Requirements & limits

- **Prerequisites:** Requires Python 3.11 or newer; live BLE work uses the optional hardware dependencies and a Garmin watch.
- **Testing evidence:** Physical-watch checks for discovery, pairing, reconnect and data downloads remain pending.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/seofernando25/garmin-proto-lab/blob/e029827ed41c97cfab86eecc7d485291009e56f2/spec/PROTOCOL.md>
2. <https://github.com/seofernando25/garmin-proto-lab/blob/e029827ed41c97cfab86eecc7d485291009e56f2/README.md>
3. <https://github.com/seofernando25/garmin-proto-lab/blob/e029827ed41c97cfab86eecc7d485291009e56f2/docs/RESEARCH_METHOD.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.