OnePlus, Oppo and Realme – Connection issues with the Kardena smartwatch

On OnePlus, Oppo and Realme smartphones, power-saving features can restrict the app in the background.
This may interrupt the connection to your Kardena smartwatch.

Common issues

• the smartwatch keeps losing connection
• WhatsApp or other messages are missing
• syncing only happens when you open the app
• the connection isn't automatically restored after a restart

1. Check battery settings

Open the app info for the app you're using.
Check the settings for Battery, Background Activity and Battery Optimisation.
Allow the app to remain active in the background.

2. Allow auto-launch

If your smartphone offers a relevant feature, allow the app to auto-launch or run automatically in the background.

3. Check permissions

In particular, allow the app to access:

• Bluetooth / nearby devices
• Notifications
• Background activity
• location, if applicable

4. Check notification access

Ensure that the app has permission to read notifications andforward them to the smartwatch.

ℹ️ Note:
The exact menu navigation differs between OxygenOS, ColorOS and Realme UI, as well as between different operating system versions.

5. Restart your smartphone and smartwatch

Restart both devices, then open the app.

💡 Tip:
If messages are only delivered while the app is open, this is most likely due to a background activity restriction.

Updated on: 10/09/2026