hello all
can someone pls help me about my code ? it is edited example of udp ntp client and when i run it, serial monitor displays nothing ... my arduino hardware is arduino uno with ethernet shield on it and in it is connected ethernet cable. i need static ip as is defined in code and i have uploaded Ethernet to 2.0.0 from github which works. do someone help me ? sory my english 
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {0xDE,0xAD,0xBE,0xEF,0xFE,0xED};
IPAddress ip(192,168,243,253);
IPAddress gateway(192,168,240,2);Â
IPAddress subnet(255, 255, 252, 0);
IPAddress dns (192,168,240,55);
unsigned int localPort = 8888;Â Â Â // local port to listen for UDP packets
const char timeServer[] = "time.nist.gov"; // time.nist.gov NTP server
const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message
byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets
// A UDP instance to let us send and receive packets over UDP
EthernetUDP Udp;
void setup() {
 // You can use Ethernet.init(pin) to configure the CS pin
 //Ethernet.init(10); // Most Arduino shields
 //Ethernet.init(5); // MKR ETH shield
 //Ethernet.init(0); // Teensy 2.0
 //Ethernet.init(20); // Teensy++ 2.0
 //Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
 //Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
 // Open serial communications and wait for port to open:
 Serial.begin(9600);
 Ethernet.begin(mac, ip, dns, gateway, subnet);
 // start Ethernet and UDP
 if (Ethernet.begin(mac) == 0) {
  Serial.println("Failed to configure Ethernet using DHCP");
  // Check for Ethernet hardware present
  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
   Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
  } else if (Ethernet.linkStatus() == LinkOFF) {
   Serial.println("Ethernet cable is not connected.");
  }
  // no point in carrying on, so do nothing forevermore:
  while (true) {
   delay(1);
  }
 }
 Udp.begin(localPort);
}
void loop() {
 sendNTPpacket(timeServer); // send an NTP packet to a time server
 // wait to see if a reply is available
 delay(1000);
 if (Udp.parsePacket()) {
  // We've received a packet, read the data from it
  Udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer
  // the timestamp starts at byte 40 of the received packet and is four bytes,
  // or two words, long. First, extract the two words:
  unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
  unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
  // combine the four bytes (two words) into a long integer
  // this is NTP time (seconds since Jan 1 1900):
  unsigned long secsSince1900 = highWord << 16 | lowWord;
  Serial.print("Seconds since Jan 1 1900 = ");
  Serial.println(secsSince1900);
  // now convert NTP time into everyday time:
  Serial.print("Unix time = ");
  // Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
  const unsigned long seventyYears = 2208988800UL;
  // subtract seventy years:
  unsigned long epoch = secsSince1900 - seventyYears;
  // print Unix time:
  Serial.println(epoch);
  // print the hour, minute and second:
  Serial.print("The UTC time is ");   // UTC is the time at Greenwich Meridian (GMT)
  Serial.print((epoch % 86400L) / 3600); // print the hour (86400 equals secs per day)
  Serial.print(':');
  if (((epoch % 3600) / 60) < 10) {
   // In the first 10 minutes of each hour, we'll want a leading '0'
   Serial.print('0');
  }
  Serial.print((epoch % 3600) / 60); // print the minute (3600 equals secs per minute)
  Serial.print(':');
  if ((epoch % 60) < 10) {
   // In the first 10 seconds of each minute, we'll want a leading '0'
   Serial.print('0');
  }
  Serial.println(epoch % 60); // print the second
 }
 // wait ten seconds before asking for the time again
 delay(10000);
 Ethernet.maintain();
}
// send an NTP request to the time server at the given address
void sendNTPpacket(const char * address) {
 // set all bytes in the buffer to 0
 memset(packetBuffer, 0, NTP_PACKET_SIZE);
 // Initialize values needed to form NTP request
 // (see URL above for details on the packets)
 packetBuffer[0] = 0b11100011; // LI, Version, Mode
 packetBuffer[1] = 0;  // Stratum, or type of clock
 packetBuffer[2] = 6;  // Polling Interval
 packetBuffer[3] = 0xEC; // Peer Clock Precision
 // 8 bytes of zero for Root Delay & Root Dispersion
 packetBuffer[12] = 49;
 packetBuffer[13] = 0x4E;
 packetBuffer[14] = 49;
 packetBuffer[15] = 52;
 // all NTP fields have been given values, now
 // you can send a packet requesting a timestamp:
 Udp.beginPacket(address, 123); // NTP requests are to port 123
 Udp.write(packetBuffer, NTP_PACKET_SIZE);
 Udp.endPacket();
}