Withings to Garmin Connect Bridge

I want to sync my Withings Body Scale with Garmin Connect. However, a direct connection is not possible and the workaround by connecting Withings -> MyFitnessPal -> Garmin Connect does not work reliably for me. Therefore, i write this script to sync my weight data to GC from Withings using the respective APIs. This is intended to run in a Docker container and be scheduled to run by the host system.

Build

Build the docker image with

docker build -t withings-garmin-bridge .

Usage

Run with

docker run -e UPDATE_INTERVAL=0 -v /path/to/config:/app -p 5681:5681 --rm withings-garmin-bridge

-e UPDATE_INTERVAL=0: disables the automatic update. The script will run once and exit. This is useful for testing or initial registering. The interval time is set in seconds. Additionally, you can set LOG_LEVEL to DEBUG to get more information (default: INFO)
-v /path/to/config:/app: /path/to/config should contain the secrets.yaml file as described below and should be writable by the user running the container
-p 5681:5681 The port 5681 is used for the local webserver to receive the OAuth callback from Withings.
--rm Remove the container after it exits. All persistent data is saved in /path/to/config

Behavior

Only new data since the last sync will be uploaded to Garmin. Therefore, just run the program regularly.
When running for the first time, necessay tokens will be requested from Withings and Garmin. The tokens will be saved in the .tokenstore folder. It might be useful to generate the keys on your local system and copy the secrets.yaml, the .tokenstore folder and the .last_sync.txt to your server where the container will be running in the long term.

Secrets, Keys etc...

Withings

Create a Withings account, if you don't have one
Create a Withings developer account and login to the developer portal. The company name is not important.
Create an Application with Public API Integration
Target Environment: Development, Name and description are not important. Callback URL: http://127.0.0.1:5681
IMPORTANT: Save the client_id and secret in the secrets.yaml as shown below
When you run the script for the first time, you will be asked to authorize the application. Follow the instructions in the console.

The used port can be changed, but make sure to change it in the secrets.yaml file and in the Withings Dashboard!

Garmin Connect

For connecting to Garmin just add your credentials to the secrets.yaml file as described below.

Secrets.yaml

Generate a secrets.yaml file with the following content:

garmin:
  email: <YOUR EMAIL>
  password: <YOUR PASSWORD>
withings:♫
  client_id: <YOUR CLIENT_ID>
  secret: <YOUR SECRET>
  callback_uri: http://127.0.0.1:5681 # this line is optional

blamcodes/WithingsGCBridge