git clone https://github.com/nopnop2002/esp-idf-uart2bt
cd esp-idf-uart2bt/classic_bt
idf.py set-target esp32
idf.py menuconfig
idf.py flash

git clone https://github.com/nopnop2002/esp-idf-uart2bt
cd esp-idf-uart2bt/ble
idf.py set-target {esp32/esp32s3/esp32c3}
idf.py menuconfig
idf.py flash

unsigned long lastMillis = 0;

void setup() {
  Serial.begin(115200);
}

void loop() {
  while (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    Serial.println(command);
  }

  if(lastMillis + 1000 <= millis()){
    Serial.print("Hello World ");
    Serial.println(millis());
    lastMillis += 1000;
  }

  delay(1);
}