# GarminHRM600: reconstructing HRM 600 BLE and stored-file exchanges

> GarminHRM600 implements a direct BLE client for the Garmin HRM 600 heart-rate strap using documented Multi-Link, GFDI and protobuf FileSyncService exchanges. Its CLI streams heart rate and Running Dynamics, downloads stored FIT files and reconstructs absolute timestamps from the strap's event clock and file identifiers. A protocol reference records message layouts and the author's probe results.

- Type: Case study
- Targets: 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/mskerwiderski/GarminHRM600>
- Primary source: <https://github.com/mskerwiderski/GarminHRM600/blob/c48b98e3c26f421d2bad30b525cf37d13d268f0d/README.md>
- Catalog page: <https://awesomerea.org/resources/garminhrm600-case/>
- Record JSON: <https://awesomerea.org/resources/garminhrm600-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/garminhrm600-case/index.md)

## Requirements & limits

- **Prerequisites:** Python 3.12 or newer and a BLE-capable machine; developed and tested on macOS.
- **Prerequisites:** A worn HRM 600 strap that is disconnected from other central devices; first connection requires pairing.
- **Testing evidence:** The author reports hardware testing with HRM 600 firmware 5.20.0.
- **License:** MIT License; adapted portions retain attribution under the upstream MIT terms.

## Primary sources

1. <https://github.com/mskerwiderski/GarminHRM600/blob/c48b98e3c26f421d2bad30b525cf37d13d268f0d/README.md>
2. <https://github.com/mskerwiderski/GarminHRM600/blob/c48b98e3c26f421d2bad30b525cf37d13d268f0d/docs/gfdi-filetransfer.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.