FitTrack2/FitnessSync/specs/002-fitbit-garmin-sync/research.md

Research: Fitbit/Garmin Data Sync

Date: 2025-12-24

This document outlines the research performed for the Fitbit/Garmin data sync feature.

garth Library for Garmin Communication

Decision: The garth library will be used for all communication with the Garmin Connect API.

Rationale:

• The user's initial technical specification explicitly mentioned and provided examples using garth.
• The library appears to be actively maintained and provides the necessary functionality for fetching activities and health metrics.
• It handles the authentication flow with Garmin, which is a complex part of the integration.

Alternatives considered:

• garminconnect: The user's requirements.txt includes this library, but the technical details provided in the prompt favored garth. garth seems to be a more modern library for interacting with the Garmin API.

Key Findings from User Prompt & garth Documentation:

• The user's prompt provided detailed code snippets for using garth to fetch DailySteps and DailyHRV. This will serve as a strong starting point for the implementation.
• The garth library offers a variety of other metric types that can be explored for future enhancements (e.g., stress, sleep).
• Authentication is handled by the garth.client.Garth class, which needs to be configured with the user's credentials. The application already has a mechanism for storing API tokens, which will be used to store the Garmin credentials.

API Endpoint Design

Decision: The API endpoints will be implemented as described in the user's initial technical specification.

Rationale: The user provided a complete and well-defined set of API endpoints, including request/response models and URL paths. This design is consistent with a standard RESTful API and meets all the requirements of the feature.

Alternatives considered: None. The user's specification was clear and complete.