I had a problem connecting wu-bt10 midi adapter (on CASIO PX-S1100) to phone in Chordana Play for Piano. It was necessary to enable the location on the phone. By default, I have it turned off, I turn it on only when necessary. I allowed the application access to the location, but did not include the location itself. When I turned it on, the adapter immediately appeared in the list Bluetooth Midi Device and the connection was successful.