#include <WiFi.h>
#include "time.h"
#include "sntp.h"
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* ntpServer1 = "pool.ntp.org";
const char* ntpServer2 = "time.nist.gov";
//const long gmtOffset_sec = 3600;
//const int daylightOffset_sec = 3600;
const char* time_zone = "WIB-7"; // TimeZone rule for Europe/Rome including daylight adjustment rules (optional)
void printLocalTime()
{
struct tm timeinfo;
if (!getLocalTime(&timeinfo)) {
Serial.println("No time available (yet)");
return;
}
Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
}
// Callback function (get's called when time adjusts via NTP)
void timeavailable(struct timeval *t)
{
Serial.println("Got time adjustment from NTP!");
printLocalTime();
}
void setup()
{
Serial.begin(115200);
// set notification call-back function
sntp_set_time_sync_notification_cb( timeavailable );
/**
NTP server address could be aquired via DHCP,
NOTE: This call should be made BEFORE esp32 aquires IP address via DHCP,
otherwise SNTP option 42 would be rejected by default.
NOTE: configTime() function call if made AFTER DHCP-client run
will OVERRIDE aquired NTP server address
*/
sntp_servermode_dhcp(1); // (optional)
/**
This will set configured ntp servers and constant TimeZone/daylightOffset
should be OK if your time zone does not need to adjust daylightOffset twice a year,
in such a case time adjustment won't be handled automagicaly.
*/
//configTime(gmtOffset_sec, daylightOffset_sec, ntpServer1, ntpServer2);
/**
A more convenient approach to handle TimeZones with daylightOffset
would be to specify a environmnet variable with TimeZone definition including daylight adjustmnet rules.
A list of rules for your zone could be obtained from https://github.com/esp8266/Arduino/blob/master/cores/esp8266/TZ.h
*/
configTzTime(time_zone, ntpServer1, ntpServer2);
//connect to WiFi
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println(" CONNECTED");
}
void loop()
{
delay(5000);
printLocalTime(); // it will take some time to sync time :)
}