How to enable modem log in nRF9160?

RE: How to enable modem log in nRF9160?

Martin Lesund — Tue, 02 Jul 2019 13:48:29 GMT

Hi TW,

I would recommend that you test out the at_client sample and just run it with LTE Link Monitor.

Please state which NCS tag you are using as well.

Some eNBs does not support ePCO so I would recommend you to try to send the command:

AT%XEPCO=0

before you turn on the modem (at+cfun=1).

Usually, you get more than enough information from the modem/network with the help from the at_host library and using the LTE Link Monitor.

BR,
Martin L.

RE: How to enable modem log in nRF9160?

Balamurugan — Fri, 31 May 2019 13:27:13 GMT

Thanks!!.

By following the above steps modem logging is enabled.

Please help us parsing attached logs.

devzone.nordicsemi.com/.../trace_2D00_2019_2D00_05_2D00_31T13_2D00_00_2D00_11.411Z_5F00_NBIOT.bin devzone.nordicsemi.com/.../trace_2D00_2019_2D00_05_2D00_31T13_2D00_13_2D00_06.848Z_5F00_LTE_5F00_M.bin

devzone.nordicsemi.com/.../2019_2D00_05_2D00_31T09_5F00_40_5F00_05.445Z_2D00_log.txt

Below log is full sequence of log powering on to network latching and getting IP address. but it is taking 10 to 20 mins to attach to network.

Could you parse/analyse attached log.

Also would be possible to release tool to read the modem log from our end.

devzone.nordicsemi.com/.../Fill_5F00_seq_5F00_network_5F00_connect_5F00_3_2D00_6_2D00_19_5F00_3_5F00_09pm.bin

Modem Firmware version:mfw_nrf9160_0.7.0-29.alpha

nrf dk version:v0.4.0-79-gee5cf34

RE: How to enable modem log in nRF9160?

jbrzozoski — Fri, 31 May 2019 01:52:41 GMT

There is a detailed blog post about it that was put up very recently here:

https://devzone.nordicsemi.com/nordic/b/blog/posts/how-to-get-modem-trace-using-trace-collector-in-nrf-connect

That spits out a binary log that Nordic hasn't given out a decoder for yet. You'll need a Nordic employee to help analyze it.

In my own experience, you can usually get a quick idea why the cellular connection is failing to without going through all that, though. While the modem is offline, send the command "AT+CEREG=5" to activate extra modem status messages, and then connect with the COPS command. As the modem tries different towers, you will get CEREG messages from the modem. Pay attention to the cause type and reject cause fields of any CEREG messages that appear. If you're not getting *any* CEREG messages, that would imply the modem is not seeing any towers at all.

Also, it sounds like this is your first time connecting, which implies you just got your dev kit. They've upgraded the modem firmware a couple times recently and the new version is much better and also enables a lot more cellular bands than the old one (allowing you to see more towers). You may want to check which version you're running with "AT+CGMR" and download the newest version if you're not already running it.