Arduino NTP REQUEST with ethercard library

#include <EtherCard.h>

#include <Wire.h>
#include "RTClib.h"

#define TIME_ZONE               +1
#define INTERVAL                1000

static byte mymac[] = {0x00,0x1A,0x4B,0x38,0x0C,0x5C};
byte Ethernet::buffer[700];

static byte ntpServer[] = {193,204,114,232};
static byte srcPort = 0;
unsigned long lastTime = 0;

uint32_t timeStamp;
boolean requestSent;
boolean timeSet;

void setup () {

  Serial.begin(57600);
  Serial.println("NTP Demo");
  Serial.println();
  requestSent = false;
  timeSet = false;
  connessione_eth();
}


 void loop() {
  richiesta_ntp();
  }

void connessione_eth(){

    if (!ether.begin(sizeof Ethernet::buffer, mymac, 4))
    Serial.println( "Failed to access Ethernet controller");
 else
   Serial.println("Ethernet controller initialized");

  if (!ether.dhcpSetup())
    Serial.println("Failed to get configuration from DHCP");
  else
    Serial.println("DHCP configuration done");

  ether.printIp("IP Address:\t", ether.myip);
  ether.printIp("Netmask   :\t", ether.mymask);
  ether.printIp("Gateway   :\t", ether.gwip);

}

void richiesta_ntp(){

 ether.packetLoop(ether.packetReceive());

    if(requestSent && ether.ntpProcessAnswer(&timeStamp, srcPort)) {
      Serial.println("NTP answer received");
      Serial.println();
      Serial.print("Timestamp: ");
      Serial.println(timeStamp);
      Serial.println();
      requestSent = false;
      timeSet = true;
    }

  if (!timeSet){
    unsigned long time = millis();
    if(time - lastTime > INTERVAL) {
      lastTime = time;
      ether.ntpRequest(ntpServer, srcPort);
      Serial.println("NTP request sent");
      requestSent = true;

    }
  }
}