//vars
unsigned int igUpdateTime;
char val[];

void setup()
{
         Serial.begin(9600);
         Serial1.begin(9600);
         igUpdateTime = millis();
}

void loop()
{
         //Excute loop every 1/2 second
	     if(millis() - igUpdateTime > 500) 
         {
               igUpdateTime = millis();
               
               if (Serial.available() > 0)
               {
                    //Read Data From App
                    val = Serial.read();
               
                    //Send to Arduino Seria Monitor on PC (via USB cable)
                    Serial1.println(val)
               }
         }
}