Serial Port BI

bool ledBinkStatus = false;
//SoftwareSerial inSerial(0, 1); // RX, TX
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  // Keep SDA/D2 OUTPUT to LOW
  pinMode(2, OUTPUT);
  digitalWrite(2, LOW);
  
  // start serial port (On USB)
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  Serial.println("Goodnight moon!");

  Serial1.begin(115200);
  Serial1.println("Good morning!");
}

void loop() {
  if (Serial1.available()) {
    Serial.write(Serial1.read());
    bink();
  }

  if (Serial.available()) {
    Serial1.write(Serial.read());
    bink();
  }
}

void bink() {
  ledBinkStatus = !ledBinkStatus;
  digitalWrite(LED_BUILTIN, ledBinkStatus);   // turn the LED on (HIGH is the voltage level)
}