How to add a button for ModemManager on Ubuntu GUI

[王道之]

Dan Williams <dcbw at redhat.com> 于2019年2月26日周二 下午10:55写道：

> On Tue, 2019-02-26 at 14:23 +0800, 王道之 wrote:
> > Hey
> > Recently I am doing some test development on ModemManager.
> > There is a requirement that add a button on the Ubuntu GUI to set IP
> > family(ipv4 or ipv6) of the ModemManager.(Just for test now)
> > Here are my questions:
> > 1.The Ubuntu desktop GUI button should be a Dbus client? Or how the
> > button
> > communication with the ModemManager?
>
> UIs typically communicate with NetworkManager (or if KDE, then KDE's
> plasma-nm) and tell NetworkManager to update the connection details.
>
> NetworkManager is what actually sends configuration to ModemManager
> when the connection is requested.
>
> > 2.After a Modem be created in ModemManager, we can find the menu for
> > MM in
> > the GUI. Is the menu as a Dbus client connect to NetworkManager or
> > just
> > connect with ModemManager?
>
> The menu is a DBus client of NetworkManager and ModemManager. But the
> bits that would do v4/v6 interact with NetworkManager.
>
> > 3.How to judge the GUI setting has sent to ModemManager? I have no
> > idea to
> > read the what is going on in the ModemManager Dbus session.
>
> The process that happens is usually this...
>
> - ModemManager finds a new modem; NetworkManager listens to MM and
> creates a new NMDevice object for the modem
> - a UI applet listens to NetworkManager for the Device object and then
> displays the modem in the menu.
> - the UI applet listens to ModemManager for signal and carrier
> information.
> - when the user wants to connect WWAN the first time, the UI applet
> will ask for some additional information like carrier name and plan so
> that it can determine which APN to use
>

Hi Dan
I have noticed that the UI applet on the Ubuntu 18.04 now always set the IP
family as IPV4，
and there is no choice to IPV6 or IPV4V6. As the IPV6 is used more and more
widely，maybe the offical menu should consider add this function.
Quincy


> - when the UI knows what APN to use, it then asks NM to create a new
> Connection for the modem (using that APN) and connect the device
> - NM then handles connecting WWAN, including asking ModemManager to
> start the packet data connection, and then performs IP address
> configuration
>
> If you need to modify the v4/v6 preference, the place to do that would
> typically be in the UI that asks for the APN, since that's where the
> Connection object details are requested from the user.
>
> You need to be a bit careful though, since not all modems support v6 or
> mixed v4v6 PDP contexts. ModemManager indicates what the modem supports
> on D-Bus, so the UI you construct should also query ModemManager for
> the modem's capability and only present choices that will actually
> succeed.
>
> Dan
>
> > I have search the questions on Internet, but not get the
> > answer.(Maybe the
> > search info not exact) Thanks for your any help information!
> >
> > Quincy
> > _______________________________________________
> > ModemManager-devel mailing list
> > ModemManager-devel at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
>
>
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