nRF9160 configuration without GNSS

RE: nRF9160 configuration without GNSS

helsing — Fri, 05 Jan 2024 20:47:54 GMT

Happy new year, and great to hear that it is working. Thank you for posting the solution.

Best regards,

Håkon

RE: nRF9160 configuration without GNSS

Fabrice D — Tue, 02 Jan 2024 09:49:22 GMT

Hi Helsing, and Happy New-Year.

Sorry for the delay due to holidays.

I have updated the firmwares with the last version on Nordic site (nrfconnect-setup-4.3.0.x64.exe). At the end of the update, I have switch off/on the modem. It seems it is needed. Then, I applied AT+CFUN=0, AT+CEREG=5, AT%XSYSTEMMODE=1,0,0,0, AT+CFUN=1. And now, it seems that everything is ok. GNSS is not activated anymore.

Regards

RE: nRF9160 configuration without GNSS

helsing — Thu, 21 Dec 2023 14:48:44 GMT

[quote user=""]

I have applied the following commands:

AT+CFUN=0

[/quote]

This shuts down the modem. From the AT reference manual, regarding CFUN:

0 – Sets the device to minimum functionality. Disables both transmit and receive RF circuits and deactivates LTE and GNSS services.

[quote user=""]

AT+CEREG=5
AT%XSYSTEMMODE=1,0,0,0

[/quote]

You need to fire these two commands while the modem is on. Then you could store it with CFUN=0, supposedly followed by CFUN=1.

RE: nRF9160 configuration without GNSS

helsing — Thu, 21 Dec 2023 14:10:14 GMT

Are you running the Asset Tracker application, if so, which version? And which nRF Connect SDK version and Modem Firmware Version are you using?

[quote user=""]But after maybe one or two minutes, the modem is rebooted, and if I apply the command AT%XSYSTEM?, I obtain the result %XSYSTEMMODE: 1,0,1,0, meaning that the GNSS has been activated. It seems that a tracker is activated… How to prevent this?[/quote]

After you apply %XSYSTEMMODE=1,0,0,0 this is only written to Non-volatile Memory(NVM) approx. every 48 hours or with +CFUN=0. This means that the modem might change mode but this will not be remembered after a reset. Try firing +CFUN=0 after %XSYSTEMMODE=1,0,0,0 to see whether the settings are retained.

RE: nRF9160 configuration without GNSS

helsing — Thu, 21 Dec 2023 10:40:42 GMT

Hi Desplanques, just letting you know we have started looking into this.