SenseCAP T1000a no longer connects to TTN

Products & Technology SenseCAP
1

I had my tracker connected to The Things Network. But it stopped working just when I took it on a trip abroad. The gateway is a Dagino LP8 device if that is of any concern.

The log in TTN says:

Join-request to cluster-local Join Server failed: DevNonce is too small

These are the things I tried:

  • Flash most recent firmware on the tracker
  • Reset DevNonces in TTN
  • Reset the device to factory settings in the Android APP
  • Delete the device from TTN and add it again

Nothing has helped though. Now TTN tries to reconnect the device but this fails:

Transmit downlink: downlink transmission failed with result TOO_EARLY

After that the same error from the beginning appears a few times:

Join-request to cluster-local Join Server failed: DevNonce is too small

What can I try next?

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2

I am sorry I dont know about this… but hopefully someone does

3

I’m now connected again to TTN. And I can also see data on my Home Assistant server, which was the main goal.

But for that I had to do several things differently from what the docs say:

  • The device has to be added to TTN manually. Using the TTN device repository makes it stop working. The necessary settings are not all provided in the docs and I had to ask ChatGPT for the missing ones.
  • Using the Sensecraft Android app (which is a piece of work by itself, not very user friendly) you have to configure the LoRa platform as “Other Platform”. Choosing “The Things Network” makes the device stop working. (See the errors in my first post.)
  • The payload formatter provided by Seeed does not work. Only after using the one found on Github I was able to see all the data correctly.

I’m coming to the conclusion that the device is probably well designed, but just very poorly maintained and documented. Maybe it is better if you use Sensecraft, but connecting it to TTN does not work in the way the official documentation says.

And what’s most concerning: The process above was very annoying. But it does not explain why the device has stopped working in the first place. That makes it very unreliable and quite useless as a tracking device.

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