netdev - Re: Understanding what's going on when using a Huawei E173 USB 3G web-stick (UMTS/HSPA)

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Date:	Wed, 12 Nov 2014 14:34:02 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Aleksander Morgado <aleksander@...ksander.es>
Cc:	Dan Williams <dcbw@...hat.com>, Greg KH <greg@...ah.com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: Understanding what's going on when using a Huawei E173 USB 3G
 web-stick (UMTS/HSPA)

On Wed, Nov 12, 2014 at 12:51 PM, Aleksander Morgado
<aleksander@...ksander.es> wrote:
>
> On Tue, Nov 4, 2014 at 5:55 PM, Dan Williams <dcbw@...hat.com> wrote:
>>
>> > The next mystery is what is network-manager doing in the background?
>> > I have seen that modem-manager is invoked, but as said I would like to
>> > understand the "internas" (means check the logs, turn on some
>> > debugging kernel-space/user-space, etc.).
>>
>> NetworkManager uses ModemManager for all WWAN control, NM only handles
>> the configuration storage and IP addressing parts of the setup.
>> ModemManager handles modem hardware detection, capability detection,
>> WWAN registration and setup, signal strength reporting, network
>> connection initiation, and bearer IP addressing method determination.
>>
>> If you want more information from ModemManager, you can run "mmcli
>> --help" or "mmcli --set-logging=debug".
>
>
> That (mmcli) will only be available in ModemManager >= 1.x, BTW. And beware
> of --set-logging=debug, as syslog may limit those if MM sends too many too
> fast. In general I usually prefer to ask for --debug output just in case:
> http://www.freedesktop.org/wiki/Software/ModemManager/Debugging/
>
> I saw the reporter talk about Ubuntu Precise (12.04) and Trusty (14.04), so
> only in the latter mmcli will be available (if I'm not mistaken). For
> Precise, this Ubuntu page shows how to enable debug logs:
> https://wiki.ubuntu.com/DebuggingModemmanager
>

Hi Aleksander,

thanks for the web-links.
IMHO both can be placed in the "usb-wwan-networking" documentation I
have in mind.
The fdo-weblink is distro-independant.

Regards,
- Sedat -
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