Back to Monogoto website

Nordic nRF91x

Get started with the nRF91x Development Kit

The nRF91x series is a line of cellular IoT solutions that supports LTE Cat-M1, NB-IoT, GNSS, and Bluetooth LE. It provides an affordable, pre-certified platform for evaluating and developing Nordic’s cellular IoT System-in-Package (SiP) devices. In the newer models of the series, support for NTN connectivity is also included.

nRF91x series

Quick Navigation

Getting Started with the nRF91x

Connect to the nRF91x

Connect the nRF91x to your computer using a micro USB cable.

Open the Programmer tool from nFR Connect for Desktop.

Connect your device by clicking SELECT DEVICE ↓ at the top-left corner.

Connect the nRF91x to Monogoto

Keep the nRF91 AT Commands manual next to you for more details about the commands. Click here to visit NORDICs AT Commands documentation.

Start off by inserting the Monogoto SIM card.

Open the LTE Link Monitor from nRF Connect for Desktop.

After selecting your device via the button SELECT DEVICE ↓, the AT command AT+CFUN? is sent automatically to the modem which returns: +CFUN: 0, indicating that the modem is turned off.

Reset the modem to factory settings:

AT%XFACTORYRESET=0

Enable error reporting, resulting in more descriptive error codes (optional):

AT+CMEE=1

SIM initialization selection policy

Check the SIM initialization selection policy is currently using:

AT%CSUS?

Expected response:

%CSUS:2 The last digit indicates the Active SIM:

0 indicates External (SIM card)

2 indicates Internal (SoftSIM)

Enable the SoftSIM card

AT%CSUS=2

Activate the cellular modem:

AT+CFUN=1

Check if the SIM card is attached and is not locked with a PIN, expected response: +CPIN: READY:

AT+CPIN?

If you receive an error, the SIM may not be inserted properly or the SIM is protected with a PIN. By default, Monogoto SIMs are not PIN protected.

Query device information

Request the modem hardware version:

AT+CGMM

Validate if the nRF91x modem runs the latest firmware:

AT+CGMR

Compare the response with the latest version found on NORDICs website under nRF91x SiP modem firmware.

How to update the nRF91x modem firmware

If you don’t run the latest modem firmware, download the latest nRF91x application and modem firmware. Unzip the file and look for a zipfile which starts with mfw (which stands for Modem Firmware).

Open the Programmer in nRF Connect for Desktop.

nRF Connect for Desktop

Click in the left menu bar Read , followed by Add file and select the modem firmware zipfile you just downloaded.

Click Write to write the latest application and modem firmware to the nRF91x. Wait for the program to report: "Completed successfully".

LTE Link Monitor

Request the IMSI (International Mobile Subscriber Identity):

AT+CIMI

Request the ICCID (Integrated Circuit Card ID), which is the identification number of the SIM card:

AT%XICCID

Network Configuration

It is possible to let the modem select the network automatically, or to manually define a network to connect with.

Option 1: Automatic Network Selection

To set the modem to automatic network selection enter the command:

AT+COPS=0

Check the network and cellular technology the modem is currently using:

AT+COPS?

Expected response: +COPS: 0,2,"<MCCMNC of operator>",7. The last digit indicates the cellular technology, 7 means LTE Cat-M1

Option 2: Manual Network Selection

Start with searching for available networks by entering the below AT Command, or by clicking the button: 

AT+COPS=?

Be patient, it may take several minutes before the modem responds, you cannot send any other AT Commands in the meantime. You may get an error message which you can ignore Error: 'AT+COPS=? ' timed out.

The modem responds with the MCCMNC codes of the available networks. It also shows the cellular technologies the networks support: 7 indicates LTE Cat-M1.

Example response:

+COPS: (2,"","","20408",7),(1,"","","20404",7),(1,"","","20416",7)

To find the names and MCCMNCs of the networks Monogoto has roaming agreements with, review the Coverage lists.

To find the profile of your SIM, visit the Monogoto Console, open the page Things and select a specific Thing. Scroll down to Mobile Identities to find your profile in the column Network Provider Name.

To find the network operator and the cellular technology the device is currently using, enter:

AT+COPS?

Expected response: +COPS: 0,2,"<MCCMNC>",7. The last digit indicates the cellular technology LTE Cat-M1.

Manually set the network and the cellular technology:

AT+COPS=1,2,"XXXXX",7

Replace XXXXX with the MCCMNC code of your operator, for example"20404" for Vodafone NL.

Check the radio signal strength and signal quality:

AT+CESQ

Example response: +CESQ: 99,99,255,255,15,53

+CESQ returns 6 values separated by commas. The last 2 values indicate the RSRQ (Reference Signal Received Quality) and RSRP (Reference Signal Received Power) respectively. RSRQ is indicated with a value between 0 and 34, RSRP is with a value between 0 and 97. Higher values represent better signal quality.

Read the LTE Cat-M1 band the modem is using:

AT%XCBAND

Example response: %XCBAND: 20

Define the cellular band(s) (optional)

It is possible to lock the modem to one or more specific bands. This may result in a faster boot cycle as the modem does not need to scan for available bands at startup.

To find the available bands the modem support:

AT%XCBAND=?

Expected response: %XCBAND: (1,2,3,4,5,8,12,13,18,19,20,25,26,28,66)

Although the modem may support many different bands, your local network operator may not. Have a look at the LTE Cat-M1 overview to find the available band(s) in your region.

The LTE Link Monitor shows most of the network information as well. Example:

Lock the modem to one or multiple bands

First, deactivate the modem: AT+CFUN=0, then run the command:

AT%XBANDLOCK=1,"<bandmask>"

Example of creating the bandmask:

To lock the modem to band 3 and 8, create a bit array where the 3rd and 8th bit are a 1 (counted from right to left): 10000100. The AT Command becomes: AT%XBANDLOCK=1,"10000100"

Reactivate the modem after locking the band: AT+CFUN=1

Test if the bands are properly set:

AT%XBANDLOCK?

Expected response: %XBANDLOCK: "<bandmask>",""

Network Activation

Set the APN to data.mono:

AT+CGDCONT=1,"IP","data.mono"

Validate if the APN is properly set:

AT+CGDCONT?

Expected response:

+CGDCONT: 1,"IP","data.mono"

Activate the PDP (packet data protocol) context:

AT+CGACT=1,1

Test if the PDP context is activated:

AT+CGACT?

Expected response:

+CGACT: 0,1
+CGACT: 1,1

Validate if your device received an IP address:

AT+CGPADDR

Expected response: +CGPADDR: 1,XX.XXX.XX.XXX

Did you receive an IP address? Congratulations! 🎉 You successfully connected the nRF9160 to Monogoto. Have a look at the Things logs in the Monogoto Console to find more details about the established connection.

Finally, visualize the network settings and status in the LTE Link Monitor with the command:

AT+CFUN?

If all went well, you should see the Modem, UICC, LTE and PDN (and optionally UART) indicators in the LTE Link Monitor turn green. You should also see network information such as the band, the network the signal quality and IP address.

Useful Links

PreviousSIMCom A7672NextiSIM

Last updated

Was this helpful?