Through the AT command set the bluetooth module to the host, but sometimes send the AT + ROLE=0 (host configuration instruction), no return parameter, to the bluetooth module to electricity is parameter, this is what reason, I changed a bluetooth module, it's the same situation, can appear sometimes sometimes but not

CodePudding user response:

Tests found that should be the child after power equipment, the host send the AT command as a command to device, so don't get back parameters, causes to restart the bluetooth host module to use the AT command