Have you seen this?

[bondango]

https://github.com/bondango/China-Blue-tooth-Audio-Devices/blob/master/13618%20BK3266SR%20Commands.xls

[araczkowski]

@bondango thx looks promising - I will soon check this more detail :)

[felixdreinulldrei]

Hi,
have you been able to check that list? I'm able to send the commands from your main list to the serial device. And it works. But I have not been able to make it work with the list shared by bondango. But it may depend on my low terminal skills for sending hex codes?! Maybe someone can give me some tips. Thanks for your work. It helped me a lot!