Hello everybody,

I'd like to connect my BTM222-bluetooth module to my arduino.
I can connect to the module after pairing it with my laptop or mobile.
When I send data to the btm222, it directly transfers the data to the UART (I can see that on the Oscilloscope). Standard settings are 19200baud 8N1.
So generally the module works...

But when it comes to changing the settings via AT commands, the module doesn't respond to anything.

I tried AT, AT?, +++ ...but nothing worked. Does anybody has some hints for me?
Is the module in some kind of idle state or something?

Thanks a lot!

Are you sending the AT codes to the BT tx/rx pins or wireless ?