serial-passtrought-arduino.ino

uint32_t baud;
uint32_t old_baud;



void loop() {
  // put your main code here, to run repeatedly:
  baud = Serial.baud();
  if (baud != old_baud) {
    SerialTTL.begin(baud);
    while (!SerialTTL);
    old_baud = baud;
  }

  if (Serial.available() > 0)
  {
    char c = Serial.read();
    SerialTTL.write(c);
  }

  if (SerialTTL.available() > 0) {
    char c = SerialTTL.read();
    Serial.write(c);
  }
}