BT auto connect after audio source was out of range or disabled

[akula3]

Hi,
I'm trying to do auto playback when audio source is back in the connection area.
It is working like I planned so far, but only after booting ESP.
If I go out of the connection area, I have to initiate the connection from audio source manually.
Is there a way to auto connect the audio source without reboot ESP?

#include "BluetoothA2DPSink.h"

BluetoothA2DPSink a2dp_sink;
bool bt_connected = false;
bool bt_prev_stat = true;

// for esp_a2d_connection_state_t see https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/bluetooth/esp_a2dp.html#_CPPv426esp_a2d_connection_state_t
void connection_state_changed(esp_a2d_connection_state_t state, void *ptr){
  Serial.println(a2dp_sink.to_str(state));
  if (a2dp_sink.to_str(state)=="Connected"){
    bt_connected = true;
  } else {
    if (a2dp_sink.to_str(state)=="Disconnected"){
      bt_connected = false;
    }
  }
}
void setup() {
  Serial.begin(115200);
  a2dp_sink.start("MyMusic");
  delay(15000);
}


void loop() {
  a2dp_sink.set_on_connection_state_changed(connection_state_changed);
  // auto playback if bt connected
  if (bt_connected && bt_connected!=bt_prev_stat){
    Serial.print(bt_connected);
    Serial.print("/");
    Serial.println(bt_prev_stat);
    bt_prev_stat = bt_connected;
    a2dp_sink.play();
  }
  // auto bt connection, when bt source was out of range and is back again
  if (!bt_connected){
    Serial.print(bt_connected);
    Serial.print("/");
    Serial.println(bt_prev_stat);
    bt_prev_stat = bt_connected;
//    a2dp_sink.disconnect();
    a2dp_sink.end(false);
    a2dp_sink.start("MyMusic");
    delay(10000);
//    a2dp_sink.connect_to_last_device();
  }

[pschatzmann]

I don't think you can solve this in a sketch. You would really need to investigate what's going on and why this is not working. You might switch the log level to debug.
It might be that the ESP32 did not notice the lost connection and therefore is not discoverable
Or that the Phone is rejecting any reconnect requests

Unfortunately this is not a priority for me since this is non of my use cases

You might also try with the latest Arduino ESP32 Version which is 2.0.1