#define RXD2 26
#define TXD2 27

void setup() {
  Serial.begin(115200);
  //Serial1.begin(9600, SERIAL_8N1, RXD2, TXD2);
  Serial2.begin(9600, SERIAL_8N1, RXD2, TXD2);
  pinMode(17, OUTPUT);
  digitalWrite(17, LOW);
  delay(50);
  digitalWrite(17, HIGH);
  delay(50);
  digitalWrite(17, LOW);
  Serial.println("Serial Txd is on pin: " + String(TX));
  Serial.println("Serial Rxd is on pin: " + String(RX));
}

void loop() { //Choose Serial1 or Serial2 as required
  while (Serial2.available()) {
    Serial.print(char(Serial2.read()));
  }
}