nRF 9160 DK LTE modem turn on

[Captain CK]

Hello,

I am beginner for the nRF 9160 DK I need to turn on the LTE modem. My questions are,

1.  Will it work for any 4FF  4G LTE enabled sim?
2.  I use 4G LTE  enabled sim but the Link monitor show result in figure below.

Do I need to update the modem firmware or change the 4FF sim card. Can nay one give guide for turn on the modem.

[Didrik Rokhaug]

Hi,

 Will it work for any 4FF  4G LTE enabled sim?

The nRF9160 should work with any LTE-M or NB-IoT enabled SIM. "Normal" 4G LTE is not supported.

 I use 4G LTE  enabled sim but the Link monitor show result in figure below.

What application are you running on the nRF9160?

I recommend you use the at_client sample, and run the following AT commands:

// You probably have to configure the modem to use NB-IoT
AT%XSYSTEMMODE=0,1,1,0
AT+CFUN=0

// These commands gives us usefull notifications when the modem is running
AT+CGMR
AT+CEREG=5
AT+CMEE=1
AT+CNEC=24
AT%CESQ=1

// If you are running mfw_nrf9160_1.3.0 or newer (check the output of AT+CGMR)
AT%MDMEV=1

// Finally turn on the modem
AT+CFUN=1

After sending AT+CFUN=1, could you let the modem run for a while, and if it doesn't connect to a network send me the log (press the "open log file" button, and upload the file)?

Best regards,

Didrik

[Captain CK]

What application are you running on the nRF9160?

I'm trying to run MQTT_ sample code for test subscribe and publish data. 

[Captain CK]

1.Below Figure show the result LTE Link Monitor shows when I try MQTT_sample code. The LTE keep searching,  Is this happen when problem in SIM or signal.

2. I am using this device setup inside a building. Hence, do I need to attach external antenna.  

3. Only I need to do was run  MQTT_sample code and monitor the subscribe details through internet. So, I need to establish interne connection.

Can you provide any recommendations.

[Didrik Rokhaug]

Debugging network connection issues is much easier if you use the at_client sample, and the AT commands I mentioned previously.

Captain CK said:

2. I am using this device setup inside a building. Hence, do I need to attach external antenna

No, cellular signals generally don't have much problems penetrating buildings.

[Captain CK]

Thanks for support. I will try with at_client sample and inform if I got any issue.

[Captain CK]

I'm using LTE-M & Nb-IoT support sim card. But I get LTE searching every time. 

[Didrik Rokhaug]

If you keep getting reject cause 15, i.e. one (or both) of these lines in the log, it indicates either a subscription or coverage problem. I recommend you contact your network operator to make sure that there are LTE-M or NB-IoT coverage in your area, and that your subscription supports it.

2021-12-29T12:37:15.484Z DEBUG modem << +CNEC_EMM: 15

2021-12-30T05:42:29.049Z DEBUG modem << +CEREG: 2,"3A99","0051A00C",9,0,15 (15 as the 6th value)