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
[off-list ref] wrote:

On Tue, Nov 4, 2014 at 5:55 PM, Dan Williams [off-list ref] wrote:

quoted

quoted

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 -