UDP.begin()

Initializes the ethernet UDP library and network settings.

EthernetUDP.begin(localPort);

localPort: the local port to listen on (int)

None

#include <SPI.h>        
#include <Ethernet.h>
#include <EthernetUdp.h>
 
// 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);
}
 
void loop() {
}

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