/* Output-side (LED) Arduino code */
  #include "SoftwareSerial.h"
  // RX: Arduino pin 2, XBee pin DOUT.  TX:  Arduino pin 3, XBee pin DIN
  SoftwareSerial XBee(0, 1);
  int LED = 13;
  
  void setup()
  {
    // Baud rate MUST match XBee settings (as set in XCTU)
    XBee.begin(9600);
    pinMode(LED, OUTPUT);
  }
  
  void loop()
  {
    if (XBee.available())  
    { 
      char c = XBee.read();
      if (c == 'H')
      {
        digitalWrite(LED, HIGH);
        delay(50);
      }
      else
      {
        digitalWrite(LED, LOW);
      }
    }
    else
    {
      digitalWrite(LED, LOW);
    }
  }