UDP test

updtest.ino

#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>

EthernetUDP udp;

void setup() {
  byte mac[] = { 0x90, 0xA2, 0xDA, 0x0F, 0x36, 0x7D }; //MAC address of Arduino Ethernet
  IPAddress ip(192, 168, 2, 177);     //static IP-address of Arduino Ethernet
  Ethernet.begin(mac,ip);
  udp.begin(8888); // local port to listen on
}

void loop() {
  udp.beginPacket("192.168.2.123",8888);
  udp.write("Hello World!\n");
  udp.endPacket();
  delay(500);
}