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UdpNTPClient.ino
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UdpNTPClient.ino
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/****************************************************************************************************************************
UdpNTPClient.ino - Simple Arduino web server sample for ESP8266 AT-command shield
For STM32 with built-in Ethernet (Nucleo-144, DISCOVERY, etc) or W5x00/ENC28J60 Ethernet
EthernetWebServer_STM32 is a library for the STM32 run built-in Ethernet WebServer
Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
Built by Khoi Hoang https://github.com/khoih-prog/EthernetWebServer_STM32
Licensed under MIT license
Version: 1.0.5
Version Modified By Date Comments
------- ----------- ---------- -----------
1.0.0 K Hoang 26/02/2020 Initial coding for STM32 with built-in Ethernet (Nucleo-144, DISCOVERY, etc) and ENC28J60
1.0.1 K Hoang 28/02/2020 Add W5x00 Ethernet shields using Ethernet library
1.0.2 K Hoang 05/03/2020 Remove dependency on functional-vlpp
1.0.3 K Hoang 22/07/2020 Fix bug not closing client and releasing socket. Add features.
1.0.4 K Hoang 23/07/2020 Add support to all STM32 boards (STM32F/L/H/G/WB/MP1) with 32K+ Flash.
1.0.5 K Hoang 16/09/2020 Add support to Ethernet2, Ethernet3, Ethernet Large for W5x00
Add support to new EthernetENC library for ENC28J60. Add debug feature.
*****************************************************************************************************************************/
#include "defines.h"
char timeServer[] = "time.nist.gov"; // NTP server
unsigned int localPort = 2390; // local port to listen for UDP packets
const int NTP_PACKET_SIZE = 48; // NTP timestamp is in the first 48 bytes of the message
const int UDP_TIMEOUT = 2000; // timeout in miliseconds to wait for an UDP packet to arrive
byte packetBuffer[NTP_PACKET_SIZE]; // buffer to hold incoming and outgoing packets
// A UDP instance to let us send and receive packets over UDP
EthernetUDP Udp;
// send an NTP request to the time server at the given address
void sendNTPpacket(char *ntpSrv)
{
// 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(ntpSrv, 123); //NTP requests are to port 123
Udp.write(packetBuffer, NTP_PACKET_SIZE);
Udp.endPacket();
}
void setup()
{
Serial.begin(115200);
while (!Serial);
Serial.println("\nStart UdpNTPClient on " + String(BOARD_NAME) + ", using " + String(SHIELD_TYPE));
ET_LOGWARN3(F("Board :"), BOARD_NAME, F(", setCsPin:"), USE_THIS_SS_PIN);
ET_LOGWARN(F("Default SPI pinout:"));
ET_LOGWARN1(F("MOSI:"), MOSI);
ET_LOGWARN1(F("MISO:"), MISO);
ET_LOGWARN1(F("SCK:"), SCK);
ET_LOGWARN1(F("SS:"), SS);
ET_LOGWARN(F("========================="));
#if !(USE_BUILTIN_ETHERNET || USE_UIP_ETHERNET)
// For other boards, to change if necessary
#if ( USE_ETHERNET || USE_ETHERNET_LARGE || USE_ETHERNET2 || USE_ETHERNET_ENC )
// Must use library patch for Ethernet, Ethernet2, EthernetLarge libraries
Ethernet.init (USE_THIS_SS_PIN);
#elif USE_ETHERNET3
// Use MAX_SOCK_NUM = 4 for 4K, 2 for 8K, 1 for 16K RX/TX buffer
#ifndef ETHERNET3_MAX_SOCK_NUM
#define ETHERNET3_MAX_SOCK_NUM 4
#endif
Ethernet.setCsPin (USE_THIS_SS_PIN);
Ethernet.init (ETHERNET3_MAX_SOCK_NUM);
#elif USE_CUSTOM_ETHERNET
// You have to add initialization for your Custom Ethernet here
// This is just an example to setCSPin to USE_THIS_SS_PIN, and can be not correct and enough
//Ethernet.init(USE_THIS_SS_PIN);
#endif //( ( USE_ETHERNET || USE_ETHERNET_LARGE || USE_ETHERNET2 || USE_ETHERNET_ENC )
#endif
// start the ethernet connection and the server:
// Use DHCP dynamic IP and random mac
uint16_t index = millis() % NUMBER_OF_MAC;
// Use Static IP
//Ethernet.begin(mac[index], ip);
Ethernet.begin(mac[index]);
// you're connected now, so print out the data
Serial.print(F("You're connected to the network, IP = "));
Serial.println(Ethernet.localIP());
Udp.begin(localPort);
}
void loop()
{
sendNTPpacket(timeServer); // send an NTP packet to a time server
// wait for a reply for UDP_TIMEOUT miliseconds
unsigned long startMs = millis();
while (!Udp.available() && (millis() - startMs) < UDP_TIMEOUT) {}
// if there's data available, read a packet
int packetSize = Udp.parsePacket();
if (packetSize)
{
Serial.print(F("UDP Packet received, size "));
Serial.println(packetSize);
Serial.print(F("From "));
IPAddress remoteIp = Udp.remoteIP();
Serial.print(remoteIp);
Serial.print(F(", port "));
Serial.println(Udp.remotePort());
// We've received a packet, read the data from it into the buffer
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;
Serial.print(F("Seconds since Jan 1 1900 = "));
Serial.println(secsSince1900);
// now convert NTP time into )everyday time:
Serial.print(F("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;
// print Unix time:
Serial.println(epoch);
// print the hour, minute and second:
Serial.print(F("The UTC time is ")); // UTC is the time at Greenwich Meridian (GMT)
Serial.print((epoch % 86400L) / 3600); // print the hour (86400 equals secs per day)
Serial.print(F(":"));
if (((epoch % 3600) / 60) < 10) {
// In the first 10 minutes of each hour, we'll want a leading '0'
Serial.print(F("0"));
}
Serial.print((epoch % 3600) / 60); // print the minute (3600 equals secs per minute)
Serial.print(F(":"));
if ((epoch % 60) < 10) {
// In the first 10 seconds of each minute, we'll want a leading '0'
Serial.print(F("0"));
}
Serial.println(epoch % 60); // print the second
}
// wait ten seconds before asking for the time again
delay(10000);
}