Sierra Wireless HL7810/HL7812

This guide covers AT commands for the Sierra Wireless HL7810 and HL7812 modules for use with Skylo NTN Network. The HL7812 additionally supports 2G fallback for enhanced connectivity options.

Set up Sierra Wireless HL7810 and HL7812

Quick Navigation

• Set up the EVK Kit

• Connect to Skylo

• Test the connection by sending UDP payload

• Useful Links

Set up the EVK Kit

• Connect the USB Cable to the EVK kit as shown on the photo above

• Connect the LTE antenna as shown on the photo above

• Connect the GPS antenna as shown on the photo above

• 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 Sierra Wireless.

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 HL7810 and HL7812 modem has been established, the board will answer with OK.

Connect the HL7810 and HL7812 to Skylo

Reset the modem to its default configuration:

Restore factory settings:

AT+NVBU=1

Example response:

OK
..
+NVBU_IND: 1,0,0,0,"00/00/00,00:00:00-0","HL78xx.5.4.12.1.RK_03_02_00_00_24271_001.20221102" 

Reboot the Module:

AT+CFUN=1,1

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:

AT+CGMR

Example response:

HL7812.5.7.3.0

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+KSIMSEL?

Expected response: +KSIMSEL8,,1 The first digit indicates the Active SIM: 0 indicates External (SIM card) 8 indicates Internal (iSIM)

Set the error reporting to verbose, resulting in more descriptive error messages (optional):

AT+CMEE=1

Set the NTN Parameter (enter the commands)

airplane mode the radio

AT+CFUN=4

Enable iGNSS

AT+GNSSSTART=0

it is crucial to wait until a valid GPS location is acquired before continuing operations. This ensures that the device is properly connected to the satellite network and can function accurately within its coverage. example response

OK

+GNSSEV: 0,1

+GNSSEV: 1,1

+GNSSEV: 3,0

+GNSSEV: 3,3

Status iGNSS

AT+GNSSLOC?

Example response:

+GNSSLOC:
Latitude: 31 Deg 44 Min 32.57 Sec N
Longitude: 34 Deg 59 Min 25.32 Sec E
GpsTime: 2025 6 22 14:25:14
FixType: 3D
HEPE: 8.20 m
Altitude: 268.700 m
AltUnc: 10.2 m
Direction: 
HorSpeed: 
VerSpeed:

Stop iGNSS

AT+GNSSSTOP

Set the APN to data.mono:

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

Define the NB-IoT NTN

AT+KSRAT=3

Lock the modem to a specific region/band

--Multi bands 23,255,256--
AT+KBNDCFG=3,C000000000000000000000000000000000000000000000000000000000400000
Band 23  = AT+KBNDCFG=3,0000000000000000000000000000000000000000000000000000000000400000
Band 255 = AT+KBNDCFG=3,4000000000000000000000000000000000000000000000000000000000000000
Band 256 = AT+KBNDCFG=3,8000000000000000000000000000000000000000000000000000000000000000

Although the modem may support many different NTN bands,

23 = Canada

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

256 = S band Europe

Lock the modem to a GNSS mode to Internal GNSS Mode

AT%NTNCFG="POS","IGNSS","0"

Reboot the Module:

AT+CFUN=1,1

Disable the radio

AT+CFUN=0

Report notification about Timing Advance calculation:

Send registration status

AT+CEREG=2
AT+KSREP=1
AT%NOTIFYEV="all",1

Enable radio

AT+CFUN=1

Example response:

OK
%NOTIFYEV:"EMMSTATE",4
+CEREG: 2
%NOTIFYEV:"SIMSTATE",3
+KSUP: 0
%NOTIFYEV: "SIB1"
%NOTIFYEV: "SIB2"
%NOTIFYEV: "SIB31"
%NOTIFYEV: "SIB1"
%NOTIFYEV: "SIB2"
%NOTIFYEV:"RRCSTATE",0
+CEREG: 0
%NOTIFYEV:"EMMSTATE",2
%NOTIFYEV:"ROAM",1
%NOTIFYEV:"EMMSTATE",9
+CEREG: 2
%NOTIFYEV: "SIB2"
%NOTIFYEV: "SIB31"
%NOTIFYEV:"RRCSTATE",1
%NOTIFYEV:"EMMSTATE",8
+CEREG: 2
%NOTIFYEV:"CSPS",0
%NOTIFYEV:"EMMSTATE",12
+CEREG: 5,"3A9D","0007DBBD",9

CEREG State Change Report Codes

The table below provides an overview of the possible values for CEREG state change reports, indicating the module's network registration status.

Value	Description
0	Not registered, and the module is not searching for a network.
1	Registered to the home network.
2	Not registered, but the module is attempting to attach or searching for a network.
3	Registration denied by the network.
4	Unknown (for example, out of coverage)
5	Registered and roaming.

Query the signal measurement

request a specific network measurement, such as signal strength, noise levels, or other metrics:

AT%MEAS="8"

Example response: %MEAS:Signal Quality:RSRP= -115,RSRQ= -15,SINR= -3,RSSI= -120.

Test the connection by sending 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:

1. Create UDP socket

2. Activate socket

3. Send UDP data

4. Close UDP Socket

1. Create UDP socket

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

AT%SOCKETCMD="ALLOCATE",1,"UDP","OPEN","18.199.15.247",1055

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>"

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.

Request info UDP Socket

AT%SOCKETCMD="INFO",1

Example response: %SOCKETCMD:"ACTIVATED","UDP","10.22.243.30","18.199.15.247",12345,7

4. Close UDP socket

End your UDP session by closing the UDP socket.

AT%SOCKETCMD="DELETE",1

Expected response: OK

Transition Between Satellite Network and Public Network

When transitioning between satellite and public networks using the Sierra Wireless Kit use the following commands:

Command for Switching to Public Network:

AT+KSRAT=0

This command activates the CAT-M mode for public networks, allowing the device to switch from satellite connectivity to a cellular public network.

Command for Switching Back to Satellite Network

AT+KSRAT=3

This command activates the NBNTN mode, returning the device to satellite network connectivity.

Great work on connecting the Sierra Wireless HL7810/HL7812 to Monogoto! Have a look at the Things logs in the Monogoto Console to find more details about the established connection.

Useful Links

• Sierra Wireless HL78XX product page

• Sierra Wireless HL78XX Product Technical Specification

• Sierra Wireless HL78XX AT Command Reference