141 lines
4.9 KiB
C++
141 lines
4.9 KiB
C++
/*
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"Get time (epoch) and local time through an NTP server"
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modified from https://github.com/sandeepmistry/esp8266-Arduino/blob/master/esp8266com/esp8266/libraries/ESP8266WiFi/examples/NTPClient/NTPClient.ino
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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----------------
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You can edit NKNTP.h in order to change to your Timezone and DST
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check https://github.com/JChristensen/Timezone/blob/master/ReadMe.md for examples.
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--------------------------------------------------------------------------------
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*/
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#include <ESP8266WiFi.h>
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#include <WiFiUdp.h>
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// the Timezone library is modified by nikant to remove eeprom access, check Timezone.h and Timezone.cpp for commented out sections
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#include <Timezone.h> //https://github.com/JChristensen/Timezone
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unsigned int localPort = 2390; // local port to listen for UDP packets
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/* Don't hardwire the IP address or we won't get the benefits of the pool.
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* Lookup the IP address for the host name instead */
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//IPAddress timeServer(129, 6, 15, 28); // time.nist.gov NTP server
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IPAddress timeServerIP; // time.nist.gov NTP server address
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const char* ntpServerName = "time.nist.gov";
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const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message
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byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets
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// A UDP instance to let us send and receive packets over UDP
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WiFiUDP udp;
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boolean NTPsuccess = false;
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void getTheNTPTime() {
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Serial.println(F("Starting UDP"));
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udp.begin(localPort);
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Serial.print(F("Local port: "));
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Serial.println(udp.localPort());
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//get a random server from the pool
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WiFi.hostByName(ntpServerName, timeServerIP);
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sendNTPpacket(timeServerIP); // send an NTP packet to a time server
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// wait to see if a reply is available
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delay(1000);
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int cb = udp.parsePacket();
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if (!cb) {
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Serial.println(F("no packet yet"));
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}
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else {
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Serial.print(F("packet received, length="));
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Serial.println(cb);
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// We've received a packet, read the data from it
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udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer
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//the timestamp starts at byte 40 of the received packet and is four bytes,
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// or two words, long. First, esxtract the two words:
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unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
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unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
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// combine the four bytes (two words) into a long integer
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// this is NTP time (seconds since Jan 1 1900):
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unsigned long secsSince1900 = highWord << 16 | lowWord;
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//Serial.print("Seconds since Jan 1 1900 = " );
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//Serial.println(secsSince1900);
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// now convert NTP time into everyday time:
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Serial.print(F("Unix time = "));
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// Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
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const unsigned long seventyYears = 2208988800UL;
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// subtract seventy years:
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unsigned long epoch = secsSince1900 - seventyYears;
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// print Unix time:
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Serial.println(epoch);
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// set time to local timezone
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setTime(myTZ.toLocal(epoch));
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NTPsuccess = true;
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}
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}
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// send an NTP request to the time server at the given address
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unsigned long sendNTPpacket(IPAddress& address)
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{
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Serial.println(F("sending NTP packet..."));
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// set all bytes in the buffer to 0
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memset(packetBuffer, 0, NTP_PACKET_SIZE);
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// Initialize values needed to form NTP request
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// (see URL above for details on the packets)
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packetBuffer[0] = 0b11100011; // LI, Version, Mode
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packetBuffer[1] = 0; // Stratum, or type of clock
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packetBuffer[2] = 6; // Polling Interval
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packetBuffer[3] = 0xEC; // Peer Clock Precision
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// 8 bytes of zero for Root Delay & Root Dispersion
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packetBuffer[12] = 49;
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packetBuffer[13] = 0x4E;
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packetBuffer[14] = 49;
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packetBuffer[15] = 52;
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// all NTP fields have been given values, now
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// you can send a packet requesting a timestamp:
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udp.beginPacket(address, 123); //NTP requests are to port 123
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udp.write(packetBuffer, NTP_PACKET_SIZE);
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udp.endPacket();
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}
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void NTP2localTime() {
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int gettimestamp = 0;
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getTheNTPTime();
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while (year() == 1970) {
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delay(1000);
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getTheNTPTime();
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gettimestamp += 1;
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if (gettimestamp == 19) {
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NTPsuccess = false;
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break;
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}
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}
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gettimestamp = 0;
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}
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