void setup() {

  Serial.begin(115200);

  // RX = GPIO44
  // TX = GPIO43
  Serial1.begin(115200, SERIAL_8N1, 44, 43);

  delay(1000);

  Serial.println("Barduino UART receiver ready");
}

void loop() {

  if (Serial1.available()) {

    String msg = Serial1.readStringUntil('\n');

    msg.trim();

    Serial.print("Received: ");
    Serial.println(msg);
  }
}