unsigned long ntp::getInternetTime(){
unsigned long epoch;
int i=0;
int t=0;
sendNTPpacket();
delay(500);
epoch=receiveTime();
t=0; // count sent tries
while ((epoch == 0xFFFFFFFF) && (t<4)){
i=0; // count receve tries
while ((epoch == 0xFFFFFFFF) && (i<4)){
delay(500);
epoch=receiveTime();
i++;
}
if (epoch == 0xFFFFFFFF) {
sendNTPpacket();
t++;
}
}
internetEpoch=epoch;
arduinoShift=millis()/1000;
return (epoch);
}
time_t getNtpTime() {
while (Udp.parsePacket() > 0)
; // discard any previously received packets
//Serial.println("$CLS,Y0,X0#TX NTP RQ");
PulseLed(BLUE, 2, 50, 10);
sendNTPpacket(timeServer);
uint32_t beginWait = millis();
uint32_t waited = millis() - beginWait;
while (waited < 3000)
{
int size = Udp.parsePacket();
if (size >= NTP_PACKET_SIZE) {
//Serial.println("$CLS,Y0,X0#RX NTP OK");
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24;
secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
secsSince1900 |= (unsigned long)packetBuffer[43];
analogWrite(GREEN, 100);
analogWrite(RED, 0);
analogWrite(BLUE, 0);
return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR + (waited / 1000);
}
waited = millis() - beginWait;
}
//Serial.println("$CLS,Y0,X0#*** NTP TO ***");
PulseLed(RED, 4, 50, 10);
analogWrite(GREEN, 0);
analogWrite(RED, 100);
analogWrite(BLUE, 0);
return 0; // return 0 if unable to get the time
}
time_t getNtpTime()
{
while (Udp.parsePacket() > 0) ; // discard any previously received packets
Serial.println("Transmit NTP Request");
sendNTPpacket(ntp_server);
uint32_t beginWait = millis();
while (millis() - beginWait < 2000) {
int size = Udp.parsePacket();
if (size >= NTP_PACKET_SIZE) {
Serial.println("Receive NTP Response");
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900;
unsigned long fracSecs;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24;
secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
secsSince1900 |= (unsigned long)packetBuffer[43];
fracSecs = (unsigned long)packetBuffer[44] << 24;
fracSecs |= (unsigned long)packetBuffer[45] << 16;
fracSecs |= (unsigned long)packetBuffer[46] << 8;
fracSecs |= (unsigned long)packetBuffer[47];
return ((time_t)(secsSince1900 - 2208988800UL)<<32) + fracSecs;
}
}
Serial.println("No NTP Response :-(");
return 0; // return 0 if unable to get the time
}
unsigned long getNTPTimestamp()
{
unsigned long ulSecs2000;
udp.begin(ntpPort);
sendNTPpacket(timeServer); // send an NTP packet to a time server
delay(1000); // wait to see if a reply is available
int cb = udp.parsePacket();
if(!cb)
{
Serial.println("Timeserver not accessible! - No RTC support!");
ulSecs2000=0;
}
else
{
Serial.print("packet received, length=");
Serial.println(cb);
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):
ulSecs2000 = highWord << 16 | lowWord;
ulSecs2000 -= 2208988800UL; // go from 1900 to 1970
ulSecs2000 -= 946684800UL; // go from 1970 to 2000
}
return(ulSecs2000);
}
time_t NTP::getNtpTime(void)
{
while (UDP.parsePacket() > 0) ; // discard any previously received packets
//get a random server from the pool
IPAddress timeServerIP;
WiFi.hostByName(_serverName, timeServerIP);
sendNTPpacket(timeServerIP);
uint32_t beginWait = millis();
while (millis() - beginWait < 1500) {
int size = UDP.parsePacket();
if (size >= NTP_PACKET_SIZE) {
Serial.println("Receive NTP Response");
UDP.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
time_t secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (time_t)packetBuffer[40] << 24;
secsSince1900 |= (time_t)packetBuffer[41] << 16;
secsSince1900 |= (time_t)packetBuffer[42] << 8;
secsSince1900 |= (time_t)packetBuffer[43];
time_t secsSince1970 = secsSince1900 - 2208988800UL;
int8_t totalOffset = (int8_t)(_timeZoneOffset);
return secsSince1970 + (time_t)(totalOffset * SECS_PER_HOUR) ;
}
yield();
}
Serial.println("No NTP Response :-(");
return 0; // return 0 if unable to get the time
}
time_t getNtptime() {
time_t epoch = 0;
//get a random server from the pool
WiFi.hostByName(ntpServerName, timeServerIP);
sendNTPpacket(timeServerIP); // send an NTP packet to a time server
// wait to see if a reply is available
delay(500);
int cb = udp.parsePacket();
if (!cb) {
//Serial.println("no packet!?");
wsSend("NTP Error");
}
else {
// Serial.print("packet received, length=");
// Serial.println(cb);
// 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;
// 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:
epoch = secsSince1900 - seventyYears;
epoch = epoch - (60 * 60 * ntpOffset); // take off 4 hrs for EDT offset
sprintf(str, "NTP epoch=%d", epoch);
wsSend(str);
}
return epoch;
}
unsigned long getNtpTime()
{
// We need to call the begin to reset the socket.
// Because localClient.connect() may occupy the same socket.
EthernetUDP theUDP;
theUDP.begin(localPort);
Serial.println("Sending time sync request to NTP server.");
sendNTPpacket(timeServer); // send an NTP packet to a time server
unsigned long startMillis = millis();
int tryCounter = 1;
while( millis() - startMillis < 1000) // wait up to one second for the response
{ // wait to see if a reply is available
if ( theUDP.available() )
{
theUDP.readPacket(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 Arduino Time format:
// Time starts on Jan 1 1970. In seconds, that's 2208988800:
const unsigned long seventyYears = 2208988800UL;
// subtract seventy years:
unsigned long epoch = secsSince1900 - seventyYears;
Serial.println("Time sync successfully.");
return epoch;
}
Serial.print("No date data available. Try counter: .");
Serial.println(tryCounter++);
delay(100);
}
Serial.println("Time sync failed.");
return 0; // return 0 if unable to get the time
}
time_t DHwifi::GetSystemTime()
{
IPAddress timeServerIP; // time.nist.gov NTP server address
const char* ntpServerName = "time.nist.gov";
//get a random server from the pool
WiFi.hostByName(ntpServerName, timeServerIP);
sendNTPpacket(timeServerIP); // send an NTP packet to a time server
// wait to see if a reply is available
delay(1000);
int cb = udp.parsePacket();
if (!cb)
{
Serial.println("no packet yet");
}
else
{
Serial.print("NTP packet received, length=");
Serial.println(cb);
// 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;
// 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;
return epoch + 3600 + 3600;
}
// wait ten seconds before asking for the time again
return 0;
}
unsigned long getNtpTime()
{
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, 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;
#ifdef LOGGING
Serial.print("Seconds since Jan 1 1900 = " );
Serial.println(secsSince1900);
#endif
// now convert NTP time into everyday 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:
#ifdef LOGGING
Serial.print(UNIX_TIME);
Serial.println(epoch);
#endif
return epoch;
}
return 0; // return 0 if unable to get the time
}
time_t getNtpTime()
{
while (Udp.parsePacket() > 0) ; // discard any previously received packets
println_dbg("Transmit NTP Request");
sendNTPpacket(timeServer);
uint32_t beginWait = millis();
while (millis() - beginWait < 1500) {
int size = Udp.parsePacket();
if (size >= NTP_PACKET_SIZE) {
println_dbg("Receive NTP Response");
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24;
secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
secsSince1900 |= (unsigned long)packetBuffer[43];
return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
}
}
println_dbg("No NTP Response :-(");
return 0; // return 0 if unable to get the time
}
// http://www.arduino.cc/en/Tutorial/WiFiRTC
unsigned long readLinuxEpochUsingNTP()
{
Udp.begin(localPort);
sendNTPpacket(timeServer); // send an NTP packet to a time server
// wait to see if a reply is available
delay(1000);
if ( Udp.parsePacket() ) {
Serial.println("NTP time received");
// 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:
// Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
const unsigned long seventyYears = 2208988800UL;
// subtract seventy years:
Udp.stop();
return (secsSince1900 - seventyYears + timeZone * SECS_PER_HOUR);
}
else {
Udp.stop();
return 0;
}
}
uint64_t getNTPtime()
{
// send an NTP packet to a time server
sendNTPpacket(timeServer);
// wait to see if a reply is available
delay(1000);
if ( Udp.available() )
{
// read the packet into the buffer
Udp.read(pb, NTP_PACKET_SIZE); // New from IDE 1.0,
// NTP contains four timestamps with an integer part and a fraction part
// we only use the integer part here
unsigned long t1, t2, t3, t4;
t1 = t2 = t3 = t4 = 0;
for (int i=0; i< 4; i++)
{
t1 = t1 << 8 | pb[16+i];
t2 = t2 << 8 | pb[24+i];
t3 = t3 << 8 | pb[32+i];
t4 = t4 << 8 | pb[40+i];
}
// part of the fractional part
// could be 4 bytes but this is more precise than the 1307 RTC
// which has a precision of ONE second
// in fact one byte is sufficient for 1307
float f1,f2,f3,f4;
f1 = ((long)pb[20] * 256 + pb[21]) / 65536.0;
f2 = ((long)pb[28] * 256 + pb[29]) / 65536.0;
f3 = ((long)pb[36] * 256 + pb[37]) / 65536.0;
f4 = ((long)pb[44] * 256 + pb[45]) / 65536.0;
// NOTE:
// one could use the fractional part to set the RTC more precise
// 1) at the right (calculated) moment to the NEXT second!
// t4++;
// delay(1000 - f4*1000);
// RTC.adjust(DateTime(t4));
// keep in mind that the time in the packet was the time at
// the NTP server at sending time so one should take into account
// the network latency (try ping!) and the processing of the data
// ==> delay (850 - f4*1000);
// 2) simply use it to round up the second
// f > 0.5 => add 1 to the second before adjusting the RTC
// (or lower threshold eg 0.4 if one keeps network latency etc in mind)
// 3) a SW RTC might be more precise, => ardomic clock :)
// convert NTP to UNIX time, differs seventy years = 2208988800 seconds
// NTP starts Jan 1, 1900
// Unix time starts on Jan 1 1970.
const unsigned long seventyYears = 2208988800UL;
t1 -= seventyYears;
t2 -= seventyYears;
t3 -= seventyYears;
t4 -= seventyYears;
//Serial.println("T1 .. T4 && fractional parts");
//PrintDateTime(DateTime(t1)); Serial.println(f1,4);
//PrintDateTime(DateTime(t2)); Serial.println(f2,4);
//PrintDateTime(DateTime(t3)); Serial.println(f3,4);
//PrintDateTime(t4);
char ntpTime[21];
//GetDatetimeString(t4, ntpTime);
Serial.println(f4,4);
Serial.println();
// Adjust timezone and DST... in my case substract 4 hours for Chile Time
// or work in UTC?
t4 -= (3 * 3600L); // Notice the L for long calculations!!
t4 += 1; // adjust the delay(1000) at begin of loop!
if (f4 > 0.4) t4++; // adjust fractional part, see above
}
else
{
Serial.println("Failed to get NTP UDP packet!");
}
}
bool doNTPupdate() {
bool ntpValid;
//get a random server from the pool
WiFi.hostByName(ntpServerName, timeServerIP);
sendNTPpacket(timeServerIP); // send an NTP packet to a time server
// wait to see if a reply is available
delay(1000);
int cb = udp.parsePacket();
if (!cb) {
Serial.println("no packet yet");
ntpValid = false;
} else {
lastNTP.updateTimeMillis = millis(); //track time of update, so we can estimate time between updates
Serial.print("packet received, length=");
Serial.println(cb);
// 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;
//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);
int8_t h_temp = (uint8_t) ((epoch % 86400L) / 3600);
h_temp -= 8; //PST offset
if (h_temp < 0) {
h_temp += 24;
}
lastNTP.hours = (uint8_t) h_temp;
;
lastNTP.minutes = (uint8_t) ((epoch % 3600) / 60);
lastNTP.seconds = (uint8_t) (epoch % 60);
ntpValid = true;
// print the hour, minute and second:
Serial.print("hours = ");
Serial.println(lastNTP.hours); // print the hour (86400 equals secs per day)
Serial.print("mins = ");
Serial.println(lastNTP.minutes);
Serial.print("secs = ");
Serial.println(lastNTP.seconds);
}
return ntpValid;
}
