Is it possible to send data while receiving audio with a bluetooth module
The Bluetooth protocol is full duplex.
But as far as I can see the A2DP doesn't support this.


  ....from the A2DP profile to the Handsfree Profile in order to run full
  duplex audio (this is not possible in A2DP)...
  
  A2PD is designed to uni-directionally transfer an audio stream in up to 2
  channel stereo, either to or from the Bluetooth host.