EvilJazz
On the recent 2.1.1 something apparently changed for Jolla C (because it is the only device which is using Bluez 5 for now) regarding bluetooth controls. When I use my bluetooth headset, play/stop music buttons stopped working with QuasarMX.
Another developer is investigating it for his music player but you may like to have a look also:
https://together.jolla.com/question/...isv2-controls/
(second answer by r0kk3rz)