Cellular modules that are based on the Qualcomm chipsets support the QMI interface. libqmi can be used to establish QMI interface for mini PCIe modules such as Quectel EC25, Quectel EC21, Telit LE910C4, Telit LE910C1 with the Raspberry Pi 3G, 4G/LTE Base HAT.
This is a minimal tutorial to establish the connection, Reference sites are listed at the end of the tutorial.
We are starting assuming you have done your hardware setup, if not please follow getting started.
Before we start, check the compatibility of the module.
should return driver information such as qmi-wwan(opensource) or GobiNet(provided by Qualcomm) as shown below. Both drivers work fine with the libqmi.
|__ Port 4: Dev 6, If 4, Class=Vendor Specific Class, Driver=qmi_wwan, 480M
NOTE: In case of the driver error please refer to the driver guide of the modules.
First, install the required packages.
sudo apt update && sudo apt install libqmi-utils udhcpc
libqmi-utils installs two main utilities (qmi-cli tool and qmi-network helper script) these are used for interaction with the modem (for more details check man qmi-cli )
Now make sure the module is ready, This can be done with the following command.
sudo qmicli -d /dev/cdc-wdm0 --dms-get-operating-mode
This should return 'online' if not try
sudo qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode='online'
Now configure the network interface for the raw-ip protocol.
sudo ip link set wwan0 down echo 'Y' | sudo tee /sys/class/net/wwan0/qmi/raw_ip sudo ip link set wwan0 up
One can confirm the data format using
sudo qmicli -d /dev/cdc-wdm0 --wda-get-data-format
Once the wwan0 is up, connect the mobile network by changing the apn='YOUR_APN' , username='YOUR_USERNAME' , password='YOUR_PASSWORD part of the line according to the information of your SIM & operator.
sudo qmicli -p -d /dev/cdc-wdm0 --device-open-net='net-raw-ip|net-no-qos-header' --wds-start-network="apn='YOUR_APN',username='YOUR_USERNAME',password='YOUR_PASSWORD',ip-type=4" --client-no-release-cid
Lastly, configure the IP address and the default route with udhcpc. This will be a non-ending command.
sudo udhcpc -q -f -i wwan0
Open a new terminal and check the
and test the interface with
ping -I wwan0 -c 5 22.214.171.124
Updated about a month ago