What will be used for transferring of audio data?

[kingsimba]

I don't know about audio or I2S. Asked just out of curiosity.
Are you planning to use ESP-NOW to transfer audio data? Does it have enough bandwidth?

[nielsnl68]

My intention is to use the code from: https://github.com/atomic14/esp32-walkie-talkie for the audio part. That worked.
Have a look at this vlog: https://www.youtube.com/watch?v=d_h38X4_eQQ

[kingsimba]

The code in esp32-walkie-talkie is using broadcast packet. https://github.com/atomic14/esp32-walkie-talkie/blob/451b8718c7ccf2d2ba74da97ea4933ba091c260c/lib/transport/src/EspNowTransport.cpp#L67

Because there are at most 250 bytes for one ESP-NOW packet. At 8000Hz-16bit, there will be 8000*2/250 = 64 packets / second.
At this rate, I think the packet loss ratio is acceptable. But if more than 2 or 3 people are broadcasting at the same time, I think it will be problematic.