// TEST RECEPTION/ ENVOI UDP
 
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
 
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 1, 102);
unsigned int localPort = 8888;
 
char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet,
char ReplyBuffer[] = "acknowledged";       // a string to send back
 
EthernetUDP Udp;
 
void setup() {
  Ethernet.begin(mac,ip);
  Udp.begin(localPort);
  Serial.begin(9600);
}
 
void loop() {
  int packetSize = Udp.parsePacket();
  if(packetSize)
  {
    Serial.print("Received packet of size ");
    Serial.println(packetSize);
    Serial.print("From ");
    IPAddress remote = Udp.remoteIP();
    for (int i =0; i < 4; i++)
    {
      Serial.print(remote[i], DEC);
      if (i < 3)
      {
        Serial.print(".");
      }
    }
    Serial.print(", port ");
    Serial.println(Udp.remotePort());
 
    // read the packet into packetBufffer
    Udp.read(packetBuffer,UDP_TX_PACKET_MAX_SIZE);
    Serial.println("Contents:");
    Serial.println(packetBuffer);
 
    // send a reply, to the IP address and port that sent us the packet we received
    //Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
    Udp.beginPacket(Udp.remoteIP(), 5000);
    Udp.write(ReplyBuffer);
    Udp.endPacket();
  }
  delay(10);
}