Hi.
I think that is a known issue.
Take a look at this discussion: https://forum.arduino.cc/t/esp32-cannot-connect-to-ntp-server-with-fixed-ip/591181
I hope this helps.
Regards,
Sara

This example worked for me until I tried setting a static IP address on the ESP32 as in https://randomnerdtutorials.com/esp32-useful-wi-fi-functions-arduino/#7 . After I added that code to setup(), I get the “Failed to obtain time” error.

The code I added above setup() was:
IPAddress local_IP(192, 168, 1, 150);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);

The code I added in setup(), before configTime() was:
Serial.println(“Initializing Wi-Fi IP config…”);
if (!WiFi.config(local_IP, gateway, subnet)) {
Serial.println(“STA Failed to configure”);
}

This code seems to set the IP address as desired, but it breaks something, preventing the time software from working.

The board I’m using is an Adafruit Feather ESP32 V2. The IDE is Arduino IDE Version 2.1.0. The espressif/arduino-esp32 version is 2.0.9.

void setTime(int yr, int month, int mday, int hr, int minute, int sec, int isDst){
//struct tm tm;
timeinfo.tm_year = yr – 1900; // Set date
timeinfo.tm_mon = month-1;
timeinfo.tm_mday = mday;
timeinfo.tm_hour = hr; // Set time
timeinfo.tm_min = minute;
timeinfo.tm_sec = sec;
timeinfo.tm_isdst = isDst; // 1 or 0
time_t t = mktime(&timeinfo);
Serial.printf(“Setting time: %s”, asctime(&timeinfo));
struct timeval AAAAAAAAAnow = { .tv_sec = t };
settimeofday(&AAAAAAAAAnow, NULL);
}

void printLocalTime()
{
if(!getLocalTime(&timeinfo)){
Serial.println(“Failed to obtain time 1”);
return;
}
/*
timeinfo.x
tm_sec int seconds after the minute 0-61*
tm_min int minutes after the hour 0-59
tm_hour int hours since midnight 0-23
tm_mday int day of the month 1-31
tm_mon int months since January 0-11
tm_year int years since 1900
tm_wday int days since Sunday 0-6
tm_yday int days since January 1 0-365
tm_isdst int Daylight Saving Time flag
*/

error
. CONNECTED
succeeded to connect to NTPServer connection and get the present time
Seconds: 40
NTP read: 2023 Apr 19 11:35:40
Epoch Time: 1681904140
Date1: 2023-04-19 11:35:40

lets change the time to the future
Setting time: Fri Mar 28 01:59:50 2053
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 3 – STA_STOP
[D][WiFiGeneric.cpp:374] _eventCallback(): Event: 3 – STA_STOP
Failed to obtain time 1
Failed to obtain time 1
Failed to obtain time 1
Failed to obtain time 1
Failed to obtain time 1

I believe that it is the configTime() call that performs the actual ntp query, so we do it once only — in the setup() function. Thereafter, we free-wheel using the time facilities of the ESP32. If accurate time is required, it would make sense to call configTime() periodically, at an interval that is appropriate to compensate for the drift of your ESP32 clock.
Regards,
Gerallt.

Hi.
That’s weird.
I’ve just testes the code now and it is working fine for me.
What’s the ESP32 add-on version that you’re using? You can check it by going to Tools > Board > Boards Manager and search for ESP32.
Regards,
Sara

I have a question regarding NTP requests: does each call of the function cause network traffic or ist there some „intelligence“ in the system that the internal clock is used for frequent requests and the NTP servers are only called once in a while to synchronise?

I need the time very frequently but want to avoid permanent network traffic.

Thanks for consideration,

Thomas