My nRf9160-DK has suddenly stopped being able to connect to the LTE-M network.

[Julia]

 It has been working with no problems. Neither the At application or the asset-tracker one will work.  Is there anyway I can test/ find out whether  there is an issue with the LTE-M network. I am in Cambridge UK where I believe there is a test LTE-M network. Thanks

[Martin Lesund]

Hi Julia,
That is very strange that it worked fine before, since the Received signal quality parameters states that the "RSRP" (Reference Signal Received Power) is "not known or not detectable".

Which SIM card are you using?

Which network are you trying to connect to?

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Let's take a detailed modem trace:

at_client_tracing.hex

using the command: nrfjprog --program at_client_tracing.hex -f nrf91 --sectorerase -r --verify

Then run the "Trace collector" from "nRF Connect for Desktop" and  "LTE Link Monitor".

In both windows select your nrf91 DK, then in the Trace Collector app click "Start Capture"

Then go over to the LTE Link Monitor window and hit the physical reset button on the nRF91 DK and verify that the log output updates accordingly.

Make sure you have "Automatic Requests" checked:

Then please send the AT-command: AT+CFUN?

Then wait ~10 sec and send the same command again. 

Wait for ~5-10 mins while the Trace collector does it's job.

You can send the AT-Command: AT+CFUN? in the LTE Link Monitor to see if there are any updates.

When you are happy, you can "stop capture" in the Trace collector app and then send me the .bin file.

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Best Regards,

Martin L.

[Julia]

Thank you , Sorry for the delay Ii was on Holiday.

I have done the above.

Is there a way of attaching the .bin file rather than just pasting into edit box?

[Martin Lesund]

There should be a button for "add attachment"

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Please download the newest modem firmware: https://www.nordicsemi.com/Products/Low-power-cellular-IoT/nRF9160/Download#infotabs

Please use the newest tag,v0.4.0 in NCS.

cd ncs/nrf
git checkout master
git pull
git checkout v0.4.0
west update

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Do you know which network you where connected to earlier?

Best Regards,
Martin  L.

[Julia]

I was connected to the Cambridge test network.

 a trace-2019-05-13T13-39-37.530Z.bincouple of Bin files for you

Updated Modem Firmware

trace-2019-05-21T13-33-35.383Z.bin