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myNTP.cpp
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myNTP.cpp
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#include "myNTP.h"
void myNTP::begin(){
udp.begin(localPort);
}
void myNTP::update(){
unsigned long currentMillis = millis();
//Warten bis das NTP-Paket angefragt werden soll
if(currentMillis - ntp_getMillis > ntp_zeitchecker){
ntp_getMillis=currentMillis;
getNTPTime();
versuche=0;
}
//Paket unterwegs, checken ob Antwort erhalten
if(ntpangefragt && currentMillis - requestWait > ntp_zeitcheckerWaitNTP){//1sec
requestWait = currentMillis;
versuche++;
if(hatntptime && versuche>versuchemax){
ntpangefragt=false; //nicht mehr auf Ergebnis warten
versuche=0;
}
checkNTPTime();
}
//Uhr alle 1 Sec aktualisieren
if(hatntptime&& currentMillis - uhr_previousMillis > uhr_zeitchecker){
uhr_previousMillis = currentMillis;
unsigned long diff = (millis()-ntp_timestamp)/1000;
unsigned long epoch = ntp_unixtime + diff + ntp_timeDIFF*60*60;//sec
if(ntp_year>0){
if(summertime (ntp_year,ntp_month, ntp_day, ntp_stunde, ntp_timeDIFF)){
epoch +=3600;//sec=1h; Sommerzeit +1h
}
issummertimechecked=true;
}
unsigned long tday = epoch / 86400L + 3;//0=Do +3 als Korrektur -> 0=Montag
ntp_wochentag=(tday) % 7; // Since January 1, 1970 was a Thursday the results are
//https://github.com/arduino-libraries/NTPClient/issues/36
time_t rawtime = epoch;
struct tm * ti;
ti = localtime (&rawtime);
ntp_year =ti->tm_year + 1900;
ntp_month =ti->tm_mon + 1;
ntp_day =ti->tm_mday;
ntp_stunde =ti->tm_hour;
ntp_minute =ti->tm_min;
ntp_secunde =ti->tm_sec;
}
}
bool myNTP::isSummertime(){
return summertime (ntp_year,ntp_month, ntp_day, ntp_stunde, ntp_timeDIFF);
}
void myNTP::setTimeDiff(byte t){
ntp_timeDIFF=t;//h
}
byte myNTP::getUTCtimediff(){
return ntp_timeDIFF;
}
bool myNTP::hatTime(){
return issummertimechecked;
}
bool myNTP::istTimeWHM(byte wochentag, byte hh, byte min){
if(
wochentag==ntp_wochentag &&
ntp_stunde==hh && ntp_minute==min
)
return true;
else
return false;
}
int myNTP::getyear(){
return ntp_year;
}
byte myNTP::getmonth(){
return ntp_month;
}
byte myNTP::getday(){
return ntp_day;
}
byte myNTP::getwochentag(){
return ntp_wochentag;
}
byte myNTP::getstunde(){
return ntp_stunde;
}
byte myNTP::getminute(){
return ntp_minute;
}
byte myNTP::getsecunde(){
return ntp_secunde;
}
//--private--
void myNTP::getNTPTime(){
if(WiFi.hostByName(ntpServerName, timeServerIP)){
sendNTPpacket(timeServerIP); // send an NTP packet to a time server
ntpangefragt=true;
}
else{
ntpangefragt=false;
//kein Netz
}
yield();
}
void myNTP::sendNTPpacket(IPAddress& address)
{
//Serial.println("sending NTP packet...");
// set all bytes in the buffer to 0
memset(packetBuffer, 0, PACKET_SIZE);//48byte
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
packetBuffer[0] = 0b11100011; // LI (11), Version (100), Mode (011)3=client
packetBuffer[1] = 0; // Stratum, or type of clock
packetBuffer[2] = 6; // Polling Interval (2046 sec)
packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer[12] = 49; //Reference Identifier source identifier or 0 (Quell-IP)
packetBuffer[13] = 0x4E; //78
packetBuffer[14] = 49; // 49(1).78(N).49(1).42(*) 192(À).53(5).103(g).103(g)|212(Ô).161(¡).179(³).138(Š)
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, PACKET_SIZE);
udp.endPacket();
}
void myNTP::checkNTPTime(){
int cb = udp.parsePacket();
if (cb) {
ntp_timestamp=millis(); //aktuelle CPU-Zeit - um Uhr weiterlaufen zu lassen
udp.read(packetBuffer, PACKET_SIZE); // read the packet into the buffer (48bytes)
/*
https://tools.ietf.org/html/rfc958
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|LI | Status | Type | Precision | 0,1,2,3
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Estimated Error | 4,5,6,7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Estimated Drift Rate | 8,9,10,11
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reference Clock Identifier | 12,13,14,15
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Reference Timestamp (64 bits) | 16-23
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Originate Timestamp (64 bits) | 24-31
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Receive Timestamp (64 bits) | 32-39
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Transmit Timestamp (64 bits) | 40-43 Sekunden seit dem 1. Januar 1900 00:00:00 Uhr
| | 44-47 Sekundenbruchteil
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
40,41 highWord secsSince1900
42,43 lowWord secsSince1900
*/
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);
//ntp_thetime=secsSince1900;
// 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:
ntp_unixtime=epoch;
ntp_zeitchecker= ntp_zeitcheckeriftime;//Zeit bis nächste Anfrage abgesetzt werden soll
hatntptime=true;
ntpangefragt=false;
}
}
//https://github.com/gmag11/NtpClient/blob/master/src/NTPClientLib.cpp
// input parameters: "normal time" for year, month, day, hour and tzHours (0=UTC, 1=MEZ)
bool myNTP::summertime(int year, byte month, byte day, byte hour, byte tzHours){
if ((month < 3) || (month > 10)) return false; // keine Sommerzeit in Jan, Feb, Nov, Dez
if ((month > 3) && (month < 10)) return true; // Sommerzeit in Apr, Mai, Jun, Jul, Aug, Sep
if (month == 3 && (hour + 24 * day) >= (1 + tzHours + 24 * (31 - (5 * year / 4 + 4) % 7))
|| month == 10 && (hour + 24 * day) < (1 + tzHours + 24 * (31 - (5 * year / 4 + 1) % 7)))
return true;
else
return false;
}