nRF9160 does not connect to network

RE: nRF9160 does not connect to network

Øyvind — Tue, 19 Dec 2023 08:32:25 GMT

Happy to hear! 👍

RE: nRF9160 does not connect to network

ralphvn — Tue, 19 Dec 2023 08:22:13 GMT

Just waiting for half an hour solves the problem.

RE: nRF9160 does not connect to network

ralphvn — Fri, 15 Dec 2023 11:04:12 GMT

It does not help, you just have to wait for 30 minutes I think, after that it starts working again, but if I reset the device too much I think it is in this RESET LOOP again.

Like my last question;

In the attachment you can see the Asset Tracker has the same problem with the RESET LOOP. It says 'Power-cycle the device to circumvent this restriction.' but the documentation you send says 'When the reset count reaches the limit, the blocking restriction is written to Non-volatile Memory (NVM). The wait time cannot be bypassed after the wait has started. If the modem is reset during the wait period, the wait period is restarted with the initial wait period.'?

I think the last is correct and the first not, so I do not think you can circumvent it?

RE: nRF9160 does not connect to network

Øyvind — Fri, 15 Dec 2023 10:25:34 GMT

Also, if that does not help. Could you try programming the AT Client sample and issue the following commands:

AT%XFACTORYRESET=0
AT+CMEE=1
AT+CNEC=24
AT+CEREG=5
AT%CESQ=1
AT%MDMEV=1
AT+CSCON=1
AT%XSIM=1
AT+CFUN=1
Skjul

RE: nRF9160 does not connect to network

Øyvind — Fri, 15 Dec 2023 10:23:46 GMT

What happens if you power-cycle the device?

RE: nRF9160 does not connect to network

ralphvn — Fri, 15 Dec 2023 09:33:01 GMT

Thanks for your answer, I think the CME ERROR is a minor thing and the root cause of my problems is in the RESET LOOP.

devzone.nordicsemi.com/.../serial_2D00_terminal_2D00_2023_2D00_12_2D00_15T092634.902Z.txt

RE: nRF9160 does not connect to network

Øyvind — Fri, 15 Dec 2023 09:02:44 GMT

Thanks for providing the modem trace. Yes, it does seems like there is an issue with the SIM. CME ERROR 13 SIM failure. Will need to investigate why the nRF9160DK returns this, and not the Thingy:91

You are also getting a modem reset loop. From Modem domain event notification %MDMEV:

RESET LOOP indicates that the modem restricts Attach attempts for the next 30 minutes. The timer does not run when the modem has no power or while it stays in the reset loop. The modem counts all the resets where the modem is not gracefully deinitialized with +CFUN=0.

If there are more than five resets, reset loop restriction is activated.v1.3.0

If there are more than seven resets, reset loop restriction is activated.v1.3.x≥1

For more information on reset loop, see nWP042 - nRF9160 Modem Reset Loop Restriction.

From the white paper linked above:

The activation of the reset loop restriction starts the timer with a 30 minute period. During this time, the modem blocks all Attach attempts. After the timer has expired, the modem starts normal behavior and automatically regains LTE service for possible connections the same way as when the modem is activated without the reset loop restriction.

[quote user="ralphvn"]The sticker at the back says PCA10090, 1.1.3 and 2023.31.[/quote]

That is perfect! Will forward this with the modem trace.

Could you test with the Asset Tracker application as well? (I assume there will not be any change)

Kind regards,
Øyvind

RE: nRF9160 does not connect to network

ralphvn — Thu, 14 Dec 2023 16:39:06 GMT

devzone.nordicsemi.com/.../trace_2D00_2023_2D00_12_2D00_14T16_2D00_09_2D00_32.098Z.mtrace devzone.nordicsemi.com/.../serial_2D00_terminal_2D00_2023_2D00_12_2D00_14T162411.115Z.txt

This is the modem trace and debug output. I started working after about 15 minutes. It looks like there is something going wrong with the simcard I think.

> AT+CPIN?

+CME ERROR: 13
> AT+CIMI

+CME ERROR: 0

And maybe there is some kind of simcard retry after 15 minutes? But still strang it starts working after 15 minutes without touching it and when I press the reset button it won't work anymore after the reboot.

I tried with an own simcard and with the provided iBasis sim, both same result.

RE: nRF9160 does not connect to network

ralphvn — Thu, 14 Dec 2023 14:49:32 GMT

I think quite long as in about an hour but no sure, at this moment it is running 15 minutes without success, at the Thingy:91 is takes 1, 2 maybe 3 seconds to jump to the next step.

I ordered this one last week, NRF9160-DK - Nordic Semiconductor - Development Kit, Nrf9160 Wireless Module, LTE-M (farnell.com), don't know where else I can information about the version of the board? The sticker at the back says PCA10090, 1.1.3 and 2023.31.

I will take a look for the modem trace, read something about it in the Cellular IoT Fundamentals course I think.

While typing this the board is connected now after 20 minutes. It is working now, but still the question why does it take max 3 seconds at the Thingy:91 and also at this board yesterday and now 20 minutes? I rebooted it and waited 5 minutes but still not registered again.

Waiting 20 minutes to make a connection and come online is not really workable for development and also not for the production product I am evaluating the SiP for.

RE: nRF9160 does not connect to network

Øyvind — Thu, 14 Dec 2023 14:36:37 GMT

Hello,

Sorry to hear that you are having these problems. Very strange that the same position and SIM card does not work on the nRF9160DK. How long have you let it run? What version of the nRF9160DK do you have? Are you able to provide a modem trace from the Serial LTE Modem?

Thanks.

Kind regards,
Øyvind