Using BluetoothSerial.h with arduino-audio-tools

[rbagdazian]

I have had great success in using your ESP32-A2DP and arduino-audio-tools libraries to implement a bluetooth based sound system with some additional internal features. I would like to be able to create an android/IOS app that communicates via BluetoothSerial for controlling some of the functionality in my system. Can BluetoothSerial protocol be used simultaneously when the ESP32-A2DP stack is running to support audio transport from a smartphone? Any thoughts on this are greatly appreciated!

[pschatzmann]

Just give it a try: You might need to call set_spp_active(true) first

[pschatzmann]

Why don't you just analyse the error message and backtrace ?
I guess you are just running out of resources (e.g. RAM)

[rbagdazian]

Yes, it may be a resources issue. The crash dump shows that the failure is occurring somewhere deep in the bluetooth stack. I thought it was odd, since when using ESP32-A2DP together with the arduino-audio-tools things are working fine, but when not using the A2DP part of the bluetooth stack, and instead using both sides of the I2S channel in master mode, the problem arises. I would have thought that the a2dp bt stack would use a lot more memory resources than the i2s drivers would. I'll spend some time digging into the esp bluetooth code where the failure is occurring to see what's happening. Thanks!

[pschatzmann]

You might also try if using PSRAM helps

[rbagdazian]

I'll give that a try. I've used the heap_caps_malloc function elsewhere for some of my custom code to avoid these kinds of memory issues. Thank you!

[rbagdazian]

That fixed the problem! I had to use a fairly small value for the limit (1024) but everything is working as it should be now.
Thank you again!