Using unofficial drop-in packages for `@fitbit/sdk-build-targets` on the Fitbit Versa 4 is possible through an unofficial approach. This method involves sideloading third-party applications onto the device. Here's a detailed overview of how to achieve this:
Background
Fitbit has not officially supported third-party app development for the Versa 4 and Sense 2 through their public SDK. However, developers have found ways to sideload apps using unofficial methods.Steps to Use Unofficial Packages
1. Enable Developer Bridge and USB Debugging:
- Connect your Versa 4 to a charger and access its settings.
- Navigate to Developer Bridge and toggle USB Debugging on. This step is crucial for connecting the device to a computer for sideloading apps[3].
2. Set Up Environment Flags:
- On your computer, set the `FITBIT_QA_COMMANDS` environment flag to enable the device's USB host to be discoverable. This can be done using the command `export FITBIT_QA_COMMANDS=1` in a terminal[1].
3. Build Your App:
- Clone or create a project that uses the unofficial drop-in package for `@fitbit/sdk-build-targets`.
- Navigate to your project directory and run `yarn install` followed by `yarn build` to prepare your app for installation[1].
4. Install the App:
- Use the Fitbit Developer Bridge to connect your device to your computer.
- Run the command to install your app on the device. This typically involves using a command like `fitbit$ build-and-install` after setting up the bridge[1].
Considerations
- Compatibility Issues: The official SDK for Versa 3 (Atlas) is not compatible with the Versa 4. You need to adjust your project settings to target the Versa 4 correctly[3].- Stability and Support: Since this is an unofficial method, there might be stability issues or unexpected behavior. Additionally, Fitbit does not officially support third-party development for these devices, so future updates could break compatibility[3][4].
- Sharing Apps: Apps can be shared via private links, but they are not available in the public app gallery[7][9].
Conclusion
While it is possible to use unofficial drop-in packages for `@fitbit/sdk-build-targets` on the Fitbit Versa 4, it requires careful setup and may involve risks due to the lack of official support. Developers must be prepared for potential issues and limitations in functionality and compatibility.Citations:
[1] https://github.com/cmengler/fitbit-app-versa4
[2] https://www.reddit.com/r/fitbit/comments/dck2iq/how_to_build_for_versa_2/
[3] https://stackoverflow.com/questions/73916842/how-can-i-enable-versa-4-usb-debugging
[4] https://community.fitbit.com/t5/SDK-Development/Unofficial-approach-to-sideload-app-on-Versa-4/td-p/5338575
[5] https://community.fitbit.com/t5/SDK-Development/Custom-faces-on-Versa-4/td-p/5501874/page/2
[6] https://store.google.com/us/product/fitbit_versa_4?hl=en-US
[7] https://www.reddit.com/r/fitbit/comments/185gtd7/barcodes_app_for_versa_4_sense_2_store_barcodes/
[8] https://grapheneos.org/releases
[9] https://www.reddit.com/r/fitbit/comments/1cvquad/qr_codes_app_for_versa_4_sense_2/