void setup()
{
// Start the serial ports ...
Serial.begin( 9600 );
while( !Serial ){;}  // Wait for serial port (for Leonardo only).
xbeeSerial.begin( 9600 );
// ... and set the serial port for the XBee radio.
xbee.setSerial( xbeeSerial );
// Set a non-zero frame id to receive Status packets.
xbee.setAcknowledgement(true);
}

void loop()
{
// Each SimpleZigBeeRadio instance contains two
// SimpleZigBeePacket instances, one for storing incoming
// messages and one for preparing outgoing messages.
// This example will not send any messages to the network.
// Rather, the coordinator will receive messages and display
// the contents to the hardware serial port.

// While data is waiting in the XBee serial port ...
while( xbee.available() )
{
// ... read the data.
xbee.read();
// If a complete message is available, display the contents
if( xbee.isComplete() ){
Serial.print("nIncoming Message: ");
printPacket( xbee.getIncomingPacketObject() );

}
}


delay(10); // Small delay for stability
// That's it! The coordinator is ready to go.
}



 // Function for printing the complete contents of a packet //

void printPacket(SimpleZigBeePacket & p)
{
Serial.print( START, HEX );
Serial.print(' ');
Serial.print( p.getLengthMSB(), HEX );
Serial.print(' ');
Serial.print( p.getLengthLSB(), HEX );
Serial.print(' ');
// Frame Type and Frame ID are stored in Frame Data
uint8_t checksum = 0;
for( int i=0; i<p.getFrameLength(); i++){
Serial.print( p.getFrameData(i), HEX );
Serial.print(' ');
checksum += p.getFrameData(i);
}
// Calculate checksum based on summation of frame bytes
checksum = 0xff - checksum;
Serial.print(checksum, HEX );
Serial.println();
}