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Time.ino
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Time.ino
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uint32_t unixTime() {
//get a random server from the pool
WiFi.hostByName(ntpServerName, timeServerIP);
// Serial.print("Time server IP: ");
// Serial.println(timeServerIP);
// sendNTPpacket(timeServerIP); // send an NTP packet to a time server
// 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(timeServerIP, 123); //NTP requests are to port 123
udp.write(packetBuffer, NTP_PACKET_SIZE);
udp.endPacket();
// wait to see if a reply is available
delay(1000);
int cb = udp.parsePacket();
if (!cb) {
// Serial.println("no packet yet");
return 0;
}
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, extract 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;
return epoch;
// print Unix time:
}
// Serial.println(epoch);
}
//// send an NTP request to the time server at the given address
//unsigned long sendNTPpacket(IPAddress& address)
//{
//// Serial.println("sending NTP packet...");
// // 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();
//}
void printHMS(uint32_t epoch) {
// format the hour, minute and second:
Serial.print((epoch % 86400L) / 3600); // print the hour (86400 equals secs per day)
Serial.print(':');
if ( ((epoch % 3600) / 60) < 10 ) {
// In the first 10 minutes of each hour, we'll want a leading '0'
Serial.print('0');
}
Serial.print((epoch % 3600) / 60); // print the minute (3600 equals secs per minute)
Serial.print(':');
if ( (epoch % 60) < 10 ) {
// In the first 10 seconds of each minute, we'll want a leading '0'
Serial.print('0');
}
Serial.print(epoch % 60); // print the second
return;
}