The connection between the phone and ESP32 is basically a Bluetooth speaker with an additional communication channel for non-audio related information exchange. The other device is a BT/BLE remote control which will send button pushes to the ESP32.
Code: Select all
+-----+ +-----+ +------+
| | ===A2DP===> | | <===SPP===> |Remote|
|Phone| <==AVRCP==> |ESP32| +------+
| | <===SPP===> | |
+-----+ +-----+
Thanks,
Jon