Interfacing with ModemManager

[Jose, Shijo]

Hi Aleksander,

>>
>> I need to write a custom user process that can send connection 
>> requests/user actions to ModemManager and also receive status 
>> notifications from ModemManager such as change of connection status, signal statistics, etc.
>>
>> What inter-process communication interface does ModemManager provide 
>> in order to achieve this? Dbus messages or by directly using APIs?
>>
>> Will looking at Network Manager or mmcli source help understand how to 
>> communicate with MM?
>>

>ModemManager exposes a DBus interface. If you install the "d-feet"
>program and look for ModemManager in the system bus you'll understand clearly how the objects and interfaces exposed work. If you install the "dbus-monitor" program and >monitor for messages in the "system"
>bus while using e.g. mmcli you'll see the DBus messages being transferred.
>
>Client applications all interface with DBus, but they may do it in different ways. Some applications may want to use "raw" DBus proxies and request/responses, while others use the >"libmm-glib" library, which provides a high level API that hides almost completely the usage of DBus, see:
>https://www.freedesktop.org/software/ModemManager/libmm-glib/1.6.0/
>
>Using libmm-glib does NOT require your program to be in C. You can write programs in any language supported by "GObject introspection bindings"; and that includes e.g. Lua, >Python or Javascript; see e.g.:
>https://cgit.freedesktop.org/ModemManager/ModemManager/tree/examples/modem-watcher-python
>https://cgit.freedesktop.org/ModemManager/ModemManager/tree/examples/modem-watcher-javascript
>
>Of course, you can also write your program in C, and you can use mmcli as an example of that:
>https://cgit.freedesktop.org/ModemManager/ModemManager/tree/cli


Thanks for the detailed response!

-
Shijo