Echo cancelling may be difficult to achieve with good performance within the ESP32. If that is indeed the case, then perhaps the ES7243 ADC on the LyraT-Mini development board, for example, can be replaced with Fortemedia FM1288 device (or similar) that has inbuilt DSP specifically for Echo Cancelli...

Can't find any code either. Looks from the hardware schematics of the Espressif audio development boards that the Mic signal and speaker feedback signal were intended to occupy the left and right channels of I2S, and the processing intended to occur within the ESP32 for AEC. However, I have been una...