LPWA - Remote Network connections with libqmi

Owned by Nikolay Henneberg
24 May, 2023
3 min read

USB Connect LPWA based on Qualcomm Chipsatz supporting QMI interface. QMI is Qualcomm's proprietary protocol for using Virtual Ethernet on the USB-Connect LPWA to establish IP connectivity with the mobile operator. It can replace the AT commands or be used together with the serial port. Software libqmi can be used to install the QMI interface for modules. This is a brief tutorial to establish the connection.

Step 1: Install the required packages

sudo apt-get update sudo apt-get install libqmi-utils udhcpc sudo reboot

Step 2: Stop and disable the following common packages the next time you boot to ensure proper modem operation and to avoid interference.

sudo systemctl stop ModemManager.service sudo systemctl disable ModemManager.service sudo reboot

Step 3: Now make sure that the module is ready for use, this can be done by using the following command

sudo qmicli -d /dev/cdc-wdm0 --dms-get-operating-mode

If not, this should bring you back online:

Step 4: Shutting down the interface

Step 5: The next step is to configure the network interface for the raw-ip protocol.

Step 6: Restart the interface

Step 7: You can confirm the data format with

You will get something similar to that:

Step 8: Connect to the mobile network by changing the part of the 'YOUR_APN', 'YOUR_USERNAME', 'YOUR_PASSWORD' lines according to your SIM card details. Remove these options if a user name and password are not required.

You will get something similar to that:

Step 9: Configure the IP address and default route using udhcpc

You will get something similar to that:

Step 10: Check the assigned IP address and test the connection.

You will get something similar to that:

Step 11: To test the connection

You will get something similar to that: