Re: stopping modem manager

[Dan Williams <dcbw redhat com>]

On Fri, 2010-08-27 at 11:00 -0700, hong sheng wrote:
> Hi Jikra,
> 
> I am new to networkmanager open source and need your help.
> 
> For networkmanager 0.80, do you mean networkmanager will also bring up
> modem-manager? But I didn't see it. Is it because networkmanager
> doesn't detect the modem in udev?

Yes, NM will poke MM via D-Bus service activation when NM starts.  D-Bus
service activation is a great facility but it has historically been a
bit difficult for people to setup if they are building everything
themselves.

Basically, dbus-daemon listens for requests from clients (like NM) and
if the client requests a service that is not yet running, dbus-daemon
looks in /usr/share/dbus-1/system-services/ for a special file that
contains launch parameters.  If one exists for that service, dbus-daemon
will then queue the client's request, start that service, and deliver
the client's request when the service is alive.

> Also, I have questions of relationship between networkmanager and
> modem-manager. I read the code of networkmanager 0.8.0, and
> modem-manager is part of it. When we do compile or build, install, 

Not entirely; what you're seeing is the NM glue code to take
user-provided configuration and tell ModemManager to start the 3G
connection using that configuration, and device management to fit modems
into the NM device model that any NM-aware client already uses.

> will "modem-manager" exe-file automatically be generated? But it seems
> there is no main() function in the folder of modem-manager. And I
> didn't see modem-manager exe file be generated when I do make install
> networkmanager.  Or we need to download a separate packet to build and
> install modem-manager?

It's a separate project available on Freedesktop like NetworkManager:

http://cgit.freedesktop.org/ModemManager/ModemManager/

> Also, if I want to set modem in linux terminal instead of through
> graphic applet, how can I do it? 

If you mean telling NetworkManager to bring up a predefined 3G
connection then you can use nmcli (available in NM 0.8.1 and later) to
do so, or for ealier NM versions you might be able to use
cnetworkmanager.

You can also use ModemManager without NetworkManager too, there are
various examples of getting the list of recognized modems, scanning for
providers, and connecting the modem in the test/ directory in
ModemManager git.

Dan


> Xiaohong
>    
> 
> On Fri, Aug 27, 2010 at 12:45 AM, Jirka Klimes <jklimes redhat com>
> wrote:
>         On Thursday 26 of August 2010 23:52:05 X.H. Sheng wrote:
>         > Hi Jirka,
>         >
>         > Could you send the file of
>         org.freedesktop.ModemManager.service?
>         >
>         > I have one as follows in my ubuntu machine:
>         >
>         > [D-BUS Service]
>         > Name=org.freedesktop.ModemManager
>         > Exec=/usr/sbin/modem-manager
>         > User=root
>         >
>         
>         Yes, that's the right content of the file.
>         However, you don't have to and should not do anything with
>         this file.
>         
>         The above suggestion about removing it is just a workaround to
>         disable modem-
>         manager to be started via NetworkManager daemon.
>         
>         >
>         > Should I must run modem-manager to start modem in the
>         embedded system
>         > rather than pc? I looked into the networkmanager 0.8 open
>         source and
>         > noticed modem-manager is part of NetworkManager, then,
>         instead of starting
>         > a separate modem-manager daemon,  can I just run
>         NetworkManger and let
>         > NetworkManager handles the modem? If I can do so, how can I
>         set the
>         > configuration and system-settting?
>         >
>         
>         modem-manager is complementary program to NetworkManager and
>         it is used to
>         manage modems. You don't have to execute it manually. It is
>         run automatically
>         by NetworkManager.
>         So, you just have to plug your modem and that's it. As far as
>         configuration is
>         concerned, you should set up a connection using
>         nm-connection-editor. You can
>         run it from terminal or just right-click on nm-applet in
>         systray and choose
>         "Edit Connections...". Then select "Mobile Broadband" tab and
>         add your
>         connection.
>         
>         See also:
>         https://help.ubuntu.com/10.04/internet/C/connecting-mobile.html
>         
>         Jirka
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