//Sender 
#include <XBee.h>
XBee xbee = XBee();

void setup() 
{
  Serial.begin(9600);
  // Tell XBee to use Hardware Serial. It's also possible to use SoftwareSerial
  xbee.setSerial(Serial);
}

void loop() 
{
  uint8_t payload[] = { 'H', 'e', 'y' };
  XBeeAddress64 addr64 = XBeeAddress64(0x0000, 0xFFFF);
  ZBTxRequest zbTx = ZBTxRequest(addr64, payload, sizeof(payload));
  xbee.send(zbTx);
  delay(3000);
}

//Receiver 
#include <XBee.h>
XBee xbee = XBee();
ZBRxResponse rx = ZBRxResponse();

void setup() 
{
  Serial.begin(9600);
  Serial.println("Boot...");

  Serial1.begin(9600);
  xbee.begin(Serial1); 
 
}

void loop() 
{
  xbee.readPacket();
  if (xbee.getResponse().isAvailable()) 
  {
    Serial.println("Got Something.");
    xbee.getResponse().getZBRxResponse(rx);
    
    for (int i = 0; i < rx.getDataLength(); i++) 
    { 
           Serial.write(rx.getData(i)); 
    } 
    Serial.println(" ");
  }
}