I finally figured out how to pair and map my recently purchased controllers SN30pro BT + M30 2.4GhZ with the mister.
BUT: After a Reset the connection to the controllers are lost again, although the settings of the controllers are saved in the config / inputs folder.
I have to do a hard restart and do the pairing and mapping all over again. Its not even possible to pair again after a regular reset, I have to turn off the device and reboot.
UPDATE: Works now.