Satellite NTN Network

The guide provided below contains AT command instructions for the Murata LBAD0XX1SC-DM module designed to work with Skylo Satellite IoT for Non-Terrestrial Networks (NTN).

Murata LBAD0XX1SC-DM The Type 1SC module is the world’s smallest Cat. M1/NB-IoT module with global certification. It supports GPS/GNSS, OpenMCU, and Integrated SIMS.

Set up Murata Kit (LBAD0XX1SC-DM-EVK2)

Set up the EVK Kit

Connect the UBC Cable to the EVK kit.
Connect the LTE antenna
Insert the Monogoto SIM

Connect your PC to the EVK Kit

Use the USB to connect your computer to the AT CMD port of the EVK Kit

When using Windows, install the driver using the disk or USB stick provided by Murata.

Connect to the EVK kit using a terminal program. You can use PuTTY for Windows, or Screen, minicom, or Miniterm for Mac or Linux.

Set the baud rate to 115200 Enter AT, if the connection with the LBAD0XX1SC-DM modem has been established, the board will answer with OK.

Connect the LBAD0XX1SC to Skylo

Keep the AT Commands manual next to you for more details about the commands. Click here to download the latest version, and scroll down to Documentation and Resources to find the AT Commands Manual.

Reboot the Module:

ATZ

Check the status of the SIM card. The correct response should be: +CPIN: READY

AT+CPIN?

+CPIN: READY means that the SIM is ready for use and does not require any PIN entry.

Executing Commands by Version

Execute various commands based on the software version you are using. Make sure to execute the commands that correspond to your version.

Query device information

Request the product type, hardware, and firmware version:

ATI

Example response:

Revision: RK_03_02_01_00_34531_001

Revision: RK_03_02_01_00_40041_001

Request the IMSI (International Mobile Subscriber Identity):

AT+CIMI

Request the ICCID (Integrated Circuit Card ID), which is the identification number of the iSIM

AT%CCID

Check the SIM initialization selection policy is currently using:

AT%GETCFG="SIM_INIT_SELECT_POLICY"

Expected response:

SIM_INIT_SELECT_POLICY:5. The last digit indicates the Active SIM: 0 indicates External (SIM card) 5 indicates Internal (iSIM)

Enable the External SIM card

AT%SETCFG="SIM_INIT_SELECT_POLICY","0"

Reboot the Module:

ATZ

Set the NTN Parameter (enter the commands)

Revision: RK_03_02_01_00_34531_001

AT%SETACFG="radiom.config.multi_rat_enable","true"    
AT%SETACFG="radiom.config.preferred_rat_list","none"  
AT%SETACFG="radiom.config.auto_preference_mode","none"
AT%SETACFG="ntn.conf.gnss_in_use","egnss"
AT%GETACFG="ntn.conf.gnss_in_use"
AT%SETACFG="modem_apps.Mode.AutoConnectMode","true"

Revision: RK_03_02_01_00_40041_001

AT%SETACFG="radiom.config.multi_rat_enable","true"    
AT%SETACFG="radiom.config.preferred_rat_list","none"  
AT%SETACFG="radiom.config.auto_preference_mode","none"
AT%GETACFG="ntn.conf.gnss_in_use"
AT%SETACFG="modem_apps.Mode.AutoConnectMode","true"
AT%NTNCFG="POS","MANUAL","1"

Define the NB-IoT NTN

AT%RATIMGSEL=2
AT%RATACT="NBNTN",1

Lock the modem to a specific region/band

AT%SETCFG="BAND","255"

Although the modem may support many different NTN bands,

23 = Canada

255 = L band Global (Taiwan, Australia, New Zealand, Japan)

256 = S band Europe

Reset in order for the parameters to take effect

ATZ

Network Activation

Disable radio

AT+CFUN=0

Set GPS location

Revision: RK_03_02_01_00_34531_001

AT%NTNCFG="FIX",LATITUDE,LONGITUDE,40,0

Revision: RK_03_02_01_00_40041_001

AT%NTNEV="POSREQ",1
AT%NTNCFG="POS","STAT","LATITUDE","LONGITUDE","160"

example

AT%NTNCFG="FIX",33.998737,-84.095023,40,0 //RK_03_02_01_00_34531_001

AT%NTNCFG="POS","STAT","33.998737","-84.095023","160" //RK_03_02_01_00_40041_001

Set the APN to data.mono:

AT+CGDCONT=1,"IP","DATA.MONO"

Enable SIB31 reception notification:

AT%NOTIFYEV="SIB31",1

Report notification about Timing Advance calculation:

Revision: RK_03_02_01_00_34531_001

AT%TADJEV=1

Revision: RK_03_02_01_00_40041_001

AT%NTNEV="TA",1

Enable RRC State notification:

AT%NOTIFYEV="RRCSTATE",1

Send registration status

AT+CEREG=2

Enable radio

AT+CFUN=1

Example response:

Revision: RK_03_02_01_00_34531_001

%NOTIFYEV: "SIB31",....   
%TADJEVU: "TA",...       
%TADJEVU: "TAC",...     
+CEREG: 5,"07ED",....

Revision: RK_03_02_01_00_40041_001

%NOTIFYEV: "SIB31",....
%NTNEVU: "TA","RACH"...
%NTNEVU: "TA","TAC"....
%NOTIFYEV: "RRCSTATE",...
+CEREG: 5,"07D4",....

Test the connection by sending a UDP payload

When using Non-Terrestrial Networks, data can only be sent using UDP.

In order to send data using UDP, 4 AT Commands needs to be sent:

Create UDP socket
Activate socket
Send UDP data
Close UDP Socket

1. Create UDP socket

AT%SOCKETCMD="ALLOCATE",1,"UDP","OPEN","<ip address>",<port>

Example message: AT%SOCKETCMD="ALLOCATE",1,"UDP","OPEN","34.192.142.126",12345

Example response: %SOCKETCMD:1

2. Activate Socket

AT%SOCKETCMD="ACTIVATE",1

Example response: %SOCKETCMD:1

3. Send UDP data

AT%SOCKETDATA="SEND",1,<length>,"<data>"

Example message: AT%SOCKETDATA="SEND",1,13,"48656C6C6F2C20776F726C6421"

Example response: %SOCKETDATA:1,13

Make sure to exactly count the number of characters you send, or you will receive an error.

It' s not possible to send text to the module, instead we need to send hexadecimal values. Convert possible text string to hexadecimal numbers using a program like rapidtables.

It may take up to 10 seconds for the message to be fully processed.

Request info UDP Socket

AT%SOCKETCMD="INFO",1

Example response: %SOCKETCMD:"ACTIVATED","UDP","10.22.243.30","34.192.142.126",12345,7

4. Close UDP socket

End your UDP session by closing the UDP socket.

AT%SOCKETCMD="DELETE",1

Expected response: OK

Test UDP Payload with Ubidots

To quickly test if UDP messages are successfully sent, you can use a platform like Ubidots.

Learn more in our Ubidots guide: Ubidots

Great work on connecting the Murata LBAD0XX1SC-DM to Monogoto! Have a look at the Things logs in the Monogoto Console to find more details about the established connection.

Useful Links

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