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  • ModemManager.
    ModemManager provides a unified high level API for communicating with mobile
    broadband modems, regardless of the protocol used to communicate with the
    actual device (Generic AT, vendor-specific AT, QCDM, QMI, MBIM...).
    
    Using.
    ModemManager is a system daemon and is not meant to be used directly from
    the command line. However, since it provides a DBus API, it is possible to use
    'dbus-send' commands or the new 'mmcli' command line interface to control it
    from the terminal. The devices are queried from udev and automatically updated
    based on hardware events, although a manual re-scan can also be requested to
    look for RS232 modems.
    
    Implementation.
    ModemManager is a DBus system bus activated service (meaning it's started
    automatically when a request arrives). It is written in C, using glib and gio.
    Several GInterfaces specify different features that the modems support,
    including the generic MMIfaceModem3gpp and MMIfaceModemCdma which provide basic
    operations for 3GPP (GSM, UMTS, LTE) or CDMA (CDMA1x, EV-DO) modems. If a given
    feature is not available in the modem, the specific interface will not be
    exported in DBus.
    
    Plugins.
    Plugins are loaded on startup, and must implement the MMPlugin interface. It
    consists of a couple of methods which tell the daemon whether the plugin
    supports a port and to create custom MMBroadbandModem implementations. It most
    likely makes sense to derive custom modem implementations from one of the
    generic classes and just add (or override) operations which are not standard.
    There are multiple fully working plugins in the plugins/ directory that can be
    used as an example for writing new plugins. Writing new plugins is highly
    encouraged! The plugin API is open for changes, so if you're writing a plugin
    and need to add or change some public method, feel free to suggest it!
    
    License.
    The ModemManager and mmcli binaries are both GPLv2+.
    The libmm-glib library is LGPLv2+.
    
    Code of Conduct.
    Please note that this project is released with a Contributor Code of Conduct.
    By participating in this project you agree to abide by its terms, which you can
    find in the following link:
      https://www.freedesktop.org/wiki/CodeOfConduct
    CoC issues may be raised to the project maintainers at the following address:
      modemmanager-devel-owner@lists.freedesktop.org