Battery optimization settings can affect data transmission between your mobile phone and tado°. This can affect the working of Geofencing.
Samsung provides a pre-installed Smart manager App on its mobile devices on Android 6 (Marshmallow). Unfortunately, this app by default restricts all installed applications on the mobile phone. To disable battery optimization for the tado° app, please follow these steps:
Open the Smart manager app on your mobile phone
Enter the Battery section
Press the Detail button in the App optimisation section and select the tado° app from the list
Change the app optimization to Disabled for