79 lines
2.3 KiB
Arduino
79 lines
2.3 KiB
Arduino
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#include <WiFi.h>
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#include "time.h"
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#include "sntp.h"
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const char* ssid = "YOUR_SSID";
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const char* password = "YOUR_PASS";
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const char* ntpServer1 = "pool.ntp.org";
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const char* ntpServer2 = "time.nist.gov";
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const long gmtOffset_sec = 3600;
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const int daylightOffset_sec = 3600;
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const char* time_zone = "CET-1CEST,M3.5.0,M10.5.0/3"; // TimeZone rule for Europe/Rome including daylight adjustment rules (optional)
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void printLocalTime()
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{
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struct tm timeinfo;
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if(!getLocalTime(&timeinfo)){
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Serial.println("No time available (yet)");
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return;
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}
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Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
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}
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// Callback function (get's called when time adjusts via NTP)
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void timeavailable(struct timeval *t)
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{
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Serial.println("Got time adjustment from NTP!");
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printLocalTime();
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}
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void setup()
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{
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Serial.begin(115200);
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// set notification call-back function
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sntp_set_time_sync_notification_cb( timeavailable );
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/**
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* NTP server address could be aquired via DHCP,
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*
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* NOTE: This call should be made BEFORE esp32 aquires IP address via DHCP,
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* otherwise SNTP option 42 would be rejected by default.
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* NOTE: configTime() function call if made AFTER DHCP-client run
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* will OVERRIDE aquired NTP server address
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*/
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sntp_servermode_dhcp(1); // (optional)
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/**
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* This will set configured ntp servers and constant TimeZone/daylightOffset
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* should be OK if your time zone does not need to adjust daylightOffset twice a year,
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* in such a case time adjustment won't be handled automagicaly.
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*/
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configTime(gmtOffset_sec, daylightOffset_sec, ntpServer1, ntpServer2);
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/**
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* A more convenient approach to handle TimeZones with daylightOffset
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* would be to specify a environmnet variable with TimeZone definition including daylight adjustmnet rules.
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* A list of rules for your zone could be obtained from https://github.com/esp8266/Arduino/blob/master/cores/esp8266/TZ.h
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*/
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//configTzTime(time_zone, ntpServer1, ntpServer2);
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//connect to WiFi
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Serial.printf("Connecting to %s ", ssid);
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(".");
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}
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Serial.println(" CONNECTED");
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}
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void loop()
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{
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delay(5000);
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printLocalTime(); // it will take some time to sync time :)
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}
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