           byte header = createHeader(comBack);
           byte pingback[4] = { header, productID[0], productID[1], productID[2] };
 
-          Serial.write(pingback, 4);
+          tWrite(pingback, 4);
         }
       }
     }


byte handshakeMessage[] = { B00000101, 0x0, 0x0, 0x10 };

byte productID[] = { 0x0, 0x0, 0x10 };

int ledPin = 13;


void setup() {
  Serial.begin(9600, SERIAL_8O1);
  pinMode(ledPin, OUTPUT);

  DDRB = DDRB | B00110000;
}

void loop() {
