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ESP8266_Time.cpp
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ESP8266_Time.cpp
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/*
* ESP8266_Time.cpp
*/
#include "ESP8266_time.h"
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
ESP8266_Time::ESP8266_Time() {
ntpServerName = "time.nist.gov";
_udp.begin(_localPort);
}
void ESP8266_Time::update() {
Serial.println("Updating");
//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) {
_udp.read(_packetBuffer, NTP_PACKET_SIZE);
//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;
_epoch = secsSince1900 - seventyYears;
_lastMillis = millis();
Serial.println("Update done");
}
}
int ESP8266_Time::getHours() {
unsigned long temp = _getEpoche();
return (temp % 86400L) / 3600;
}
int ESP8266_Time::getMinutes() {
unsigned long temp = _getEpoche();
return (temp % 3600) / 60;
}
int ESP8266_Time::getSeconds() {
unsigned long temp = _epoch + (millis() - _lastMillis) / 1000;
return (temp % 60);
}
// send an NTP request to the time server at the given address
unsigned long ESP8266_Time::_sendNTPpacket(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();
}
unsigned long ESP8266_Time::_getEpoche() {
// update if last time was long 1h ago
if ((millis() - _lastMillis) > 3600000UL || _lastMillis == 0 || millis() < _lastMillis) {
Serial.println("Update time");
update();
}
return _epoch + (millis() - _lastMillis) / 1000;
}