well, with Cowboy its pretty the same shit. But somehow pairing is working. its needed only to be debugged. I would try to setup wireless adb connection from the notebook to the android phone and than check the adb log to try to find out what happens during pairing. @Mister_Magister please correct me, when i am wrong, somehow we need to understand what happens in the background to be able to rebuild the same process via Sailfishos app.
@Edz communicating with BTLE device without pairing is possible. Please check the VoltFish App (i have a fork on OpenRepos). VoltFish is Sailfish App for the Mooshimeter BTLE Multimeter. Sailfish connects to this Multimeter via BT address without pairing.