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libraries/NTPClient-master/NTPClient.cpp

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+/**
+ * The MIT License (MIT)
+ * Copyright (c) 2015 by Fabrice Weinberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "NTPClient.h"
+
+NTPClient::NTPClient(UDP& udp) {
+  this->_udp            = &udp;
+}
+
+NTPClient::NTPClient(UDP& udp, long timeOffset) {
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+}
+
+NTPClient::NTPClient(UDP& udp, const char* poolServerName) {
+  this->_udp            = &udp;
+  this->_poolServerName = poolServerName;
+}
+
+NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset) {
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerName = poolServerName;
+}
+
+NTPClient::NTPClient(UDP& udp, const char* poolServerName, long timeOffset, unsigned long updateInterval) {
+  this->_udp            = &udp;
+  this->_timeOffset     = timeOffset;
+  this->_poolServerName = poolServerName;
+  this->_updateInterval = updateInterval;
+}
+
+void NTPClient::begin() {
+  this->begin(NTP_DEFAULT_LOCAL_PORT);
+}
+
+void NTPClient::begin(int port) {
+  this->_port = port;
+
+  this->_udp->begin(this->_port);
+
+  this->_udpSetup = true;
+}
+
+bool NTPClient::forceUpdate() {
+  #ifdef DEBUG_NTPClient
+    Serial.println("Update from NTP Server");
+  #endif
+
+  this->sendNTPPacket();
+
+  // Wait till data is there or timeout...
+  byte timeout = 0;
+  int cb = 0;
+  do {
+    delay ( 10 );
+    cb = this->_udp->parsePacket();
+    if (timeout > 100) return false; // timeout after 1000 ms
+    timeout++;
+  } while (cb == 0);
+
+  this->_lastUpdate = millis() - (10 * (timeout + 1)); // Account for delay in reading the time
+
+  this->_udp->read(this->_packetBuffer, NTP_PACKET_SIZE);
+
+  unsigned long highWord = word(this->_packetBuffer[40], this->_packetBuffer[41]);
+  unsigned long lowWord = word(this->_packetBuffer[42], this->_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;
+
+  this->_currentEpoc = secsSince1900 - SEVENZYYEARS;
+
+  return true;
+}
+
+bool NTPClient::update() {
+  if ((millis() - this->_lastUpdate >= this->_updateInterval)     // Update after _updateInterval
+    || this->_lastUpdate == 0) {                                // Update if there was no update yet.
+    if (!this->_udpSetup) this->begin();                         // setup the UDP client if needed
+    return this->forceUpdate();
+  }
+  return true;
+}
+
+unsigned long NTPClient::getEpochTime() const {
+  return this->_timeOffset + // User offset
+         this->_currentEpoc + // Epoc returned by the NTP server
+         ((millis() - this->_lastUpdate) / 1000); // Time since last update
+}
+
+int NTPClient::getDay() const {
+  return (((this->getEpochTime()  / 86400L) + 4 ) % 7); //0 is Sunday
+}
+int NTPClient::getHours() const {
+  return ((this->getEpochTime()  % 86400L) / 3600);
+}
+int NTPClient::getMinutes() const {
+  return ((this->getEpochTime() % 3600) / 60);
+}
+int NTPClient::getSeconds() const {
+  return (this->getEpochTime() % 60);
+}
+
+String NTPClient::getFormattedTime() const {
+  unsigned long rawTime = this->getEpochTime();
+  unsigned long hours = (rawTime % 86400L) / 3600;
+  String hoursStr = hours < 10 ? "0" + String(hours) : String(hours);
+
+  unsigned long minutes = (rawTime % 3600) / 60;
+  String minuteStr = minutes < 10 ? "0" + String(minutes) : String(minutes);
+
+  unsigned long seconds = rawTime % 60;
+  String secondStr = seconds < 10 ? "0" + String(seconds) : String(seconds);
+
+  return hoursStr + ":" + minuteStr + ":" + secondStr;
+}
+
+void NTPClient::end() {
+  this->_udp->stop();
+
+  this->_udpSetup = false;
+}
+
+void NTPClient::setTimeOffset(int timeOffset) {
+  this->_timeOffset     = timeOffset;
+}
+
+void NTPClient::setUpdateInterval(unsigned long updateInterval) {
+  this->_updateInterval = updateInterval;
+}
+
+void NTPClient::setPoolServerName(const char* poolServerName) {
+    this->_poolServerName = poolServerName;
+}
+
+void NTPClient::sendNTPPacket() {
+  // set all bytes in the buffer to 0
+  memset(this->_packetBuffer, 0, NTP_PACKET_SIZE);
+  // Initialize values needed to form NTP request
+  // (see URL above for details on the packets)
+  this->_packetBuffer[0] = 0b11100011;   // LI, Version, Mode
+  this->_packetBuffer[1] = 0;     // Stratum, or type of clock
+  this->_packetBuffer[2] = 6;     // Polling Interval
+  this->_packetBuffer[3] = 0xEC;  // Peer Clock Precision
+  // 8 bytes of zero for Root Delay & Root Dispersion
+  this->_packetBuffer[12]  = 49;
+  this->_packetBuffer[13]  = 0x4E;
+  this->_packetBuffer[14]  = 49;
+  this->_packetBuffer[15]  = 52;
+
+  // all NTP fields have been given values, now
+  // you can send a packet requesting a timestamp:
+  this->_udp->beginPacket(this->_poolServerName, 123); //NTP requests are to port 123
+  this->_udp->write(this->_packetBuffer, NTP_PACKET_SIZE);
+  this->_udp->endPacket();
+}