# License: GNU GPL v2.0
String COMMAND_GET_ID = "get_id\n";
String DEVICE_ID = "USB_TEST_1";

String received;

void setup() {
  Serial.begin(115200);
  Serial.setTimeout(100);
}

void loop() {
  received = Serial.readString();
  if (received == COMMAND_GET_ID) {
    Serial.println(DEVICE_ID);
  }
}