Here I found/share now the solution for the BT watch 
https://forum.sailfishos.org/t/broken-pairing-no-connection-with-bluetooth-car-kit-10-iii-4-4-0-68/12366/10
- I install a special BT package with:
pkcon install bluez5-tools - with root or sudo I can use follow comannd lines:
sudo bluetoothctl connect D1:6C:9F:4F:9B:9C
sudo bluetoothctl disconnect D1:6C:9F:4F:9B:9C - I am happy, now only the problem how can I close an open app complete with app cover is open!
