824ad11356
We will use one single method to apply port type hints, not a mix of
them:
* If AT^GETPORTMODE is supported, prefer its hints over any other
method.
* Otherwise, try to guess hints from USB interface descriptions.
* And if none of the plugin-specific hints are supported, we'll
default to applying generic port type hints from udev tags.
Once the hints have been applied by one of the methods above, the
fallback hint sequences are run:
* Flag the first cdc-wdm port as primary if no other port has been
flagged as primary.
* Flag the USB interface 0 as PPP if no other port type hint has
been set in any other port.
The logic applying all these procedures has been refactored so that we
have separate functions for each, which is much easier to read and
follow, even if it requires multiple iterations over the port probe
list.
Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/238
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+.