This worked for me. You did have some errors in that code that did not manifest themselves first pass, but did on a second. I moved the Udp.begin() to setup() and commented out the Udp.stop(). I also used my server code.
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <utility/w5100.h>
void ShowSockStatus()
{
for (int i = 0; i < MAX_SOCK_NUM; i++) {
Serial.print("Socket#");
Serial.print(i);
uint8_t s = W5100.readSnSR(i);
Serial.print(":0x");
Serial.print(s,16);
Serial.print(" ");
Serial.print(W5100.readSnPORT(i));
Serial.print(" D:");
uint8_t dip[4];
W5100.readSnDIPR(i, dip);
for (int j=0; j<4; j++) {
Serial.print(dip[j],10);
if (j<3) Serial.print(".");
}
Serial.print("(");
Serial.print(W5100.readSnDPORT(i));
Serial.println(")");
}
}
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
EthernetServer server(80);
IPAddress timeServer(198,55,111,50);
IPAddress ip(192,168,2,2);
IPAddress gateway(192,168,2, 1);
IPAddress subnet(255, 255, 255, 0);
long timer;
EthernetUDP Udp;
void setup() {
Serial.begin(9600);
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);
Ethernet.begin(mac, ip, INADDR_NONE, gateway, subnet);
delay(500);
Udp.begin(8888);
Serial.println("Start!");
server.begin();
ShowSockStatus();
timer = millis();
}
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
// send an NTP request to the time server at the given address
unsigned long sendNTPpacket(EthernetUDP & Udp, IPAddress& 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();
}
void checkTime()
{
sendNTPpacket(Udp, timeServer); // send an NTP packet to a time server
Serial.println("");
ShowSockStatus();
// 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, esxtract 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;
// 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);
}
else
Serial.println("UDP FAIL!");
// Udp.stop();
}
void loop()
{
//Check if a web client has attached.
checkServer();
if ((millis() - timer) > 10000) {
timer = millis();
checkTime();
}
}
void checkServer()
{
EthernetClient client = server.available();
if(client) {
boolean currentLineIsBlank = true;
boolean currentLineIsGet = true;
int tCount = 0;
char tBuf[64];
int r,t;
char *pch;
Serial.print(F("Client request: "));
// this controls the timeout
int loopCount = 0;
while (client.connected()) {
while(client.available()) {
// if packet, reset loopCount
loopCount = 0;
char c = client.read();
if(currentLineIsGet && tCount < 63)
{
tBuf[tCount] = c;
tCount++;
tBuf[tCount] = 0;
}
if (c == '\n' && currentLineIsBlank) {
// send a standard http response
Serial.println(tBuf);
Serial.print(F("POST data: "));
while(client.available()) Serial.write(client.read());
Serial.println();
pch = strtok(tBuf,"?");
while(pch != NULL)
{
if(strncmp(pch,"t=",2) == 0)
{
t = atoi(pch+2);
Serial.print("t=");
Serial.println(t,DEC);
}
if(strncmp(pch,"r=",2) == 0)
{
r = atoi(pch+2);
Serial.print("r=");
Serial.println(r,DEC);
}
pch = strtok(NULL,"& ");
}
Serial.println(F("Sending response"));
client.print(F("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n<html>"));
client.println(F("<body><H1>TEST</H1>"));
client.println(F("<form method=GET>T: <input type=text name=t>
"));
client.println(F("R: <input type=text name=r>
<input type=submit></form>"));
client.println(F("</body></html>"));
client.stop();
}
else if (c == '\n') {
currentLineIsBlank = true;
currentLineIsGet = false;
}
else if (c != '\r') {
currentLineIsBlank = false;
}
}
loopCount++;
// if 10000ms has passed since last packet
if(loopCount > 10000) {
// close connection
client.stop();
Serial.println("\r\nTimeout");
}
// delay 1ms for timeout timing
delay(1);
}
Serial.println(F("done"));
}
}