#include<WiFi.h>#include"time.h"#include"sntp.h"constchar*ssid="YOUR_SSID";constchar*password="YOUR_PASS";constchar*ntpServer1="pool.ntp.org";constchar*ntpServer2="time.nist.gov";constlonggmtOffset_sec=3600;constintdaylightOffset_sec=3600;constchar*time_zone="CET-1CEST,M3.5.0,M10.5.0/3";// TimeZone rule for Europe/Rome including daylight adjustment rules (optional)
voidprintLocalTime(){structtmtimeinfo;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)
voidtimeavailable(structtimeval*t){Serial.println("Got time adjustment from NTP!");printLocalTime();}
voidsetup(){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");}