ModemManager

ModemManager is a service that automatically sets up and connects 2G/3G/4G/5G modems and provides a high level of abstraction when interacting with modems.

A few examples of functionality offered by ModemManager are:

  • initialisation of the modem
  • connecting to the Internet
  • sending/receiving SMS
  • firmware upgrades for select QMI-based modems.

In menuconfig, ModemManager is located under the Network section.

You probably need to include the kernel module for your modem in your firmware image, or on running firmware via opkg.

Common ones which should get most modems working to some extent are:

opkg update && opkg install kmod-usb-serial kmod-usb-net kmod-usb-serial-wwan kmod-usb-serial-option kmod-usb-net-qmi-wwan kmod-usb-net-cdc-mbim

ModemManager supports MBIM modems. You can included MBIM support by selecting it under the Configuration section in ModemManager's menuconfig entry.

ModemManager supports QMI modems. You can include QMI support by selecting it under the Configuration section in ModemManager's menuconfig entry.

ModemManager abstracts the configuration of your modems into standard Linux network interfaces. The example below illustrates a typical configuration:

/etc/config/network

config interface 'broadband'
    option device   '/sys/devices/platform/soc/20980000.usb/usb1/1-1/1-1.2/1-1.2.1'
    option proto    'modemmanager'
    option apn      'ac.vodafone.es'
    option username 'vodafone'
    option password 'vodafone'
    option pincode  '7423'
    option lowpower '1' 

Note the device option uses the full sysfs path of the device, not /dev/cdc-wdm0. While using /dev/cdc-wdm0 would work, it is not guaranteed to always use the same modem, so using the full sysfs path (as reported by a mmcli -m index command would show) is best practice.

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  • Last modified: 2020/09/29 17:14
  • by bbmian