LTE Link Monitor Issue with 9160

Question

I was starting to develop for our own board based on the nRF9160 where we will just be using the LTE-M and while doing so, ran into issues with enabling the LTE. To do a sanity check, I went back to the 'at_client' example in the nRF Connect SDK 2.0.2 and programmed it on. I opened up the LTE Link Monitor v2.0.1 and this is what I'm seeing -- all the status indicators are red or gray:

I was able to get the Modem and UICC to turn green *once* by pulling out the SIM card and putting it back in, but then restarted the board and everything is red again. Here is my log file contents:

2022-08-01T21:44:31.667Z DEBUG Application data folder: /Users/user/Library/Application Support/nrfconnect/pc-nrfconnect-linkmonitor
2022-08-01T21:44:32.762Z INFO Using nrf-device-lib-js version: 0.4.11
2022-08-01T21:44:32.762Z INFO Using nrf-device-lib version: 0.11.8
2022-08-01T21:44:32.763Z INFO Using nrfjprog DLL version: 10.15.4
2022-08-01T21:44:32.763Z INFO Using JLink version: JLink_V7.64e
2022-08-01T21:44:32.895Z DEBUG App pc-nrfconnect-linkmonitor v2.0.1 official
2022-08-01T21:44:32.895Z DEBUG App path: /Users/user/.nrfconnect-apps/node_modules/pc-nrfconnect-linkmonitor
2022-08-01T21:44:32.895Z DEBUG nRFConnect 3.11.1, required by the app is (^3.8.0)
2022-08-01T21:44:32.895Z DEBUG nRFConnect path: /Applications/nRF Connect for Desktop.app/Contents/Resources/app.asar
2022-08-01T21:44:32.895Z DEBUG HomeDir: /Users/user
2022-08-01T21:44:32.895Z DEBUG TmpDir: /var/folders/0l/h7c0fmrn2s99zfj4sb1qlk_r0000gn/T/
2022-08-01T21:44:32.913Z INFO Installed JLink version does not match the provided version (V7.58b)
2022-08-01T21:44:35.732Z INFO Modem port is opened
2022-08-01T21:44:35.759Z DEBUG modem >> AT+CFUN?
2022-08-01T21:44:35.801Z DEBUG modem << +CFUN: 0
2022-08-01T21:44:35.804Z DEBUG modem << OK
2022-08-01T21:44:40.573Z DEBUG modem >> AT
2022-08-01T21:44:40.585Z DEBUG modem << OK
2022-08-01T21:44:51.655Z DEBUG modem << *** Booting Zephyr OS build v3.0.99-ncs1-1  ***
2022-08-01T21:44:51.676Z DEBUG modem << The AT host sample started
2022-08-01T21:45:13.078Z DEBUG modem >> AT+CFUN?
2022-08-01T21:45:13.088Z DEBUG modem << +CFUN: 0
2022-08-01T21:45:13.125Z DEBUG modem << OK
2022-08-01T21:45:14.661Z DEBUG modem >> AT+CFUN=1
2022-08-01T21:45:14.705Z DEBUG modem << OK
2022-08-01T21:45:48.294Z DEBUG modem >> AT+COPS=?
2022-08-01T21:48:48.295Z ERROR Network search failed: Error: 'AT+COPS=?
' timed out

What could possibly be going wrong here? I thought I was just configuring our new project incorrectly, but now using the 'at_client' example I get the same behavior.

Charlie · Accepted Answer

Hi Benjamin, 
 The AT client sample does not use functions from the nRF91 LTE Link control library. As I mentioned, you need to manually send commands. Even the LTE Link Monitor Automatic requests options do is just help you send check commands. We have many nRF9160 samples to demo how to use LTE link controller , the simplest one is the UDP sample if you want to learn how to use it, please pay attend to the connect_to_lte and lte_handler functions. 
 Best regards, 
 Charlie

LTE Link Monitor Issue with 9160

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