A demo of sending udp packets, using Pollin AVR NETIO board, Arduino 1.0.1, avr-netino project

avrnetio_udpsend.ino

// 
// Environment: Pollin AVR NETIO board, Arduino 1.0.1, avr-netino (https://code.google.com/p/avr-netino/)
//
// This is a demo of sending udp packets 
// 2012-07-08 <Thomas.Mohaupt@gmail.com> http://creativecommons.org/licenses/by-sa/3.0/
// Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
// 
// On destination site you can receive the packets e.g. with 
//   nc -4ul 7777
// 
// Note: The udp packets are always send via the gateway (see below)

#include <EtherCard.h>

static unsigned int NETIO_CSPIN_ENC28J60 = 28;

byte macMy[]         = {0x00, 0x22, 0xF9, 0x01, 0x30, 0xDA };
byte ipMy[]          = {10, 0, 0, 52};
byte ipDestination[] = {10, 0, 0, 2};
byte ipGateway[]     = {10, 0, 0, 254};

unsigned int portMy = 8888; 
unsigned int portDestination = 7777; 

byte Ethernet::buffer[220];

char msg[] = {"Hello World"};

void setup() {
  ether.begin(sizeof Ethernet::buffer, macMy, NETIO_CSPIN_ENC28J60);
  
  // In the udp packet a destination mac must be inserted. But the EtherCard library 
  // will only insert the gateway mac in the udp packet. 
  // So the gateway needs to be specified here even if destination is in same subnet.
  ether.staticSetup(ipMy, ipGateway);

  // wait until arp request to gateway is finished
  while (ether.clientWaitingGw())
    ether.packetLoop(ether.packetReceive());
}

void loop() {
  ether.sendUdp(msg, sizeof msg, portMy, ipDestination, portDestination);
}