ttn-otaa-network-time.ino returns with USER CALLBACK: Not a success

[geronimoooooooo]

I need to get time to my device ttgo t-beam and therefore I used ttn-otaa-network-time.ino.
https://github.com/mcci-catena/arduino-lmic/blob/master/examples/ttn-otaa-network-time/ttn-otaa-network-time.ino

But I never pass

if (flagSuccess != 1) {
Serial.println(F("USER CALLBACK: Not a success"));
return;
}

flagSuccess has always value 0.
The communication with TTN v3 works fine and there are no other problems.

latest mcci arduino-lmic
platformIO
Regio EU868
ttgo t-beam v1.1

Does this example work with TTN v3? Do I have to set up anything special to be able to query time?

any help would be appreciated

[dhineshkumarmcci]

yes, this example work with TTN V3.

Do I have to set up anything special to be able to query time?

Yes, you have to set LMIC_ENABLE_DeviceTimeReq to 1 in config.h, please find link below.
https://github.com/mcci-catena/arduino-lmic/blob/master/src/lmic/config.h#L172

[terrillmoore]

@geronimoooooooo did this fix your problem? This is working for us, so this might not be a bug.

[terrillmoore]

Now that TTN v3 is the standard, we should probably enable device time request by default in config.h.

[cyberman54]

I can confirm that getting the time from TTN v3 network is working this way. And it's pretty precise, i see +/- 100ms.

[terrillmoore]

@cyberman54 Yes, we've found the same thing. It sometimes takes several queries to get the time, but when it comes in, it works well. I'll create an issue to track changing the default.