On phones running Android 8.0 (API level 26) and higher, it's possible to use companion device pairing. It is recommended to use this setting, especially on Android 10 and higher as without it for example the Find phone feature cannot work correctly.
After the device is paired using this method, the device can leverage the REQUEST_COMPANION_RUN_IN_BACKGROUND permission to start the app from the background. This provides a better way for Gadgetbridge to keep its service running, read more about background service stability here.
In the future there might be a possibility to use companion device pairing to perform a Bluetooth (or Wi-Fi) scan of nearby devices, without requiring the ACCESS_FINE_LOCATION or BLUETOOTH_ADMIN permission. This would minimize the number of permissions needed. Currently, these permissions are still required. See more details here: https://developer.android.com/guide/topics/connectivity/companion-device-pairing
To utilize this in Gadgetbridge, enable "CompanionDevice Pairing" in the settings:
Settings > Developer Options > Discovery and Pairing options > CompanionDevice Pairing
and add your new device via the 
icon.
Pairing existing devices as companion
For devices already in Gadgetbridge, you must re-pair (re-bond) them:
- Connect to the device:
- Go to the Debug activity:
- Click the "Pair current device as companion" button:
- Select OK on the Link question:
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Smart Device Related
- Bangle.js
- Casio devices
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- Amazfit GTR Mini
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- Sony Wena 3
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Wireless Earbuds
Others
- iTag Keyring trackers
- Nut Keyring trackers
- UM25 USB Voltage meter
- VESC BLDC controller VESC
- Flipper Zero Multi-tool Device for Geeks
- Roidmi Roidmi/Mojietu FM Trans.
- Vibratissimo Private toy
- Shell Racing Toy RC cars
Full list of supported devices
Development
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- Support for a new Device
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- Translating Gadgetbridge
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Feature Discussion
FAQ
