The nrf91670dk Asset Tracker application lose connection / does not transmit data after some (variable) time

[Tom]

Hi,

I am running the Asset Tracker application from a fresh clone of the 0.4.0 nRF connect SDK. Using the supplied iBasis SIM.

It connects after booting, and I can monitor the messages on nrfcloud.

After some time (from 15 minutes to a few hours) there is no new data received / visible on nrfcloud, and the device is listed as "not connected" on the nrfcloud overview.

The status LED on the board (LED4) is constantly lit - thus it believes it is connected.

There is no indication in the 9160 console of a disconnect / error that can allow me to work around it (restart / reconnect).

The below screenshot shows an example where the connection failed after less than 15 minutes. Also note the irregular arrival of samples towards the end.

Does anybody else see this? Is this a known instability / problem?

Tom Kr.

[Markus Tacker (he/him)]

Hei,

this issue looks like a problem which was recently fixed in https://github.com/NordicPlayground/fw-nrfconnect-nrf/pull/803/commits/208c48d5d7eabb55dd210441b90746ad26c1229e

Can you try again with the latest master of https://github.com/NordicPlayground/fw-nrfconnect-nrf ?

[Tom]

Hi, I have now done a quick test with v1.0.0-rc2, and it is even less stable. Resetting the dk, it takes some time to connect, and then after approx 16 samples terminates with Hard fault.

Second test fails in the same way after 19 points.

Third test fails silently. No error in console, but no data received in web app.

Can you confirm that you see this behaviour also?

Best regards 

Tom

[Sigurd]

Hi,

Yes, unfortunately both master and v1.0.0-rc2 are not stable. I see 2 options, either use v0.4.0 tag and add the fix from the mentioned PR to that tag, Or wait for v1.0.0 release.

[Tom]

Hi, v1.0.0 behaves good, and solved my problem.

Best regards

Tom