How to tell if NTP has been successfully update after manually setting time with setTime

[mattygsa]

Since ezt::timeStatus() == timeset even if only due to being set manually, I was hoping there was just as easy way to find out if time was set by NTP only after having set the time manually with setTime say after a reboot with no internet where a manual time entry is required and then subsequently the internet becomes available again. How can I tell (in code without monitoring serial) that the NTP time is available again?

I'm sure I'm missing something obvious here!!

[AussieMakerGeek]

I have come across this too and was hoping for an event that might be fired off when the time is synced with NTP successfully.

I have a project that requires very accurate time but may be offline. It is using an RTC as it's time source but synced/Set with ezTime. If the device boots with no internet, it relies on the battery backed RTC only, then theoretically, once the device has internet it will update the RTC. I was using the RTC time to set ezTime on boot but confused that when I called a function containing waitForSync() to update the time on the RTC after internet was connected, it did not update.

i.e

DateTime now = rtc.now();
UTC.setTime(now.unixtime());

if (waitForSync(10)){  //Get the time from the internet..
  rtc.adjust(DateTime(UTC.now())); //Set the time on the RTC
}

UTC.now() will actually be the rtc time and not the internet time, regardless of internet connectivity.

waitForSync() does not seem to actually check internet time if timeStatus() == timeSet (which seems to be the case if you have called setTime() less than 1hr ago.

Because my project will behave differently between RTC time and ezTime, i need to know when ezTime has synced with NTP rather than the RTC.

Author seems to be MIA this year...

Edit: This is confirmed by the source - Line 537 of ezTime.cpp...

if (_time_status != timeSet) {
                infoln(F("Waiting for time sync"));
                while (_time_status != timeSet) {
                    if ( timeout && (millis() - start) / 1000 > timeout ) { triggerError(TIMEOUT); return false;};
                    delay(250);
                    events();
                }
                infoln(F("Time is in sync"));
            }

So because the time is set, regardless of the source, it's not actually checking internet time...

[AussieMakerGeek]

I managed to work around this issue by reviewing the source code of the library

If you call updateNTP() directly, rather than using waitForSync() (Which calls uptateNTP() but only if time_status !=timeSet) the time_status should now be either timeNeedsSync or timeSet, purely based on NTP success/fail.

Unfortunately, updateNTP() does not return a variable itself.

I ended up with:

void syncTimeToRTC(){
  //Force the ezTime library to try internet time
  updateNTP();
  // time_status should now be either timeNeedsSync or timeSet 
  if (timeStatus() == timeSet){
    rtc.adjust(DateTime(UTC.now())); //Set the time on the RTC
    rtcInUse = 0;
  }else{
    // Relying on RTC time
    DateTime now = rtc.now();
    UTC.setTime(now.unixtime());  //Set EZTime to whatever the RTC is.
    rtcInUse = 1;
    lastFailure = millis();   
  }
}

By setting an if statement such as: if (millis() - lastFailure > 60000 && rtcInUse == 1) syncTimeToRTC(); I can make sure it's always in sync.

I also run it if network gets disconnected/reconnected.