SoftwareSerial mySerial(10, 11); // RX, TX

void setup() {

  Serial.begin(9600);
  while (!Serial) {
    ;
  }


  Serial.println("Goodnight moon!");


  mySerial.begin(115200);
  mySerial.println("Hello, world?");

}

void loop() {
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }

   if (Serial.available()) {
    mySerial.write(Serial.read());
  }


}