#include <SPI.h>
    #include <Ethernet.h>
    #include <EthernetUdp.h>          // UDP library from: bjoern@cs.stanford.edu 12/30/2008


    // Enter a MAC address and IP address for your controller below.
    // The IP address will be dependent on your local network:
    byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
    IPAddress ip(192, 168, 1, 177);

    unsigned int localPort = 8888;      // local port to listen on

    // An EthernetUDP instance to let us send and receive packets over UDP
    EthernetUDP Udp;

    void setup() {
      // start the Ethernet and UDP:
      Ethernet.begin(mac,ip);
      Udp.begin(localPort);

      Serial.begin(9600);
    }

    void loop() {
      // if there's data available, read a packet
      int packetSize = Udp.parsePacket();
      if(packetSize)
      {
        Serial.print("Received packet of size ");
        Serial.println(packetSize);
      }
      delay(10);
    }