Re: modems using same port for data & AT command

["Shawn J. Goff" <shawn7400 gmail com>]

Network statistics are a different story - you're not querying the modem 
for those; you're querying the ppp interface. The Linux kernel keeps 
track of the network flowing over that interface. If you run 'ifconfig', 
you'll likely see ppp0 as a network interface, complete with statistics.

On 04/26/2011 09:50 AM, Ran Shalit wrote:
> On Tue, Apr 26, 2011 at 3:38 PM, Shawn J. Goff <shawn7400 gmail com 
> <mailto:shawn7400 gmail com>> wrote:
>
>     Some modems, in addition to supporting serial AT commands, also
>     support proprietary binary protocols (such as Sierra's CnS) on
>     other endpoints. This usually works even when the modem is tied up
>     in a connection. Check out Dan Williams's post at
>     http://blogs.gnome.org/dcbw/2010/04/15/mobile-broadband-and-qualcomm-proprietary-protocols/
>     for more info on that.
>
>
>
>     On 04/26/2011 03:38 AM, Ran Shalit wrote:
>
>         Hello,
>         I would like to ask how NetworkManager/ModemManager deals with
>         modems which use the same port for ppp connection and for AT
>         command.
>         As far as I understand we cannot retrieve any information
>         using AT command while there is a ppp connection on that port.
>         Therefore information such as statistics cannot be retrieved
>         from modem.
>         Thank you for your time,
>         Ran
>
>
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>
> I am using a device with one port for both data and connection (MC950D 
> novatel), and it is interesting that after connecting with kppp I can 
> see in the kppp properties (after pressing "details" button) a window 
> of "kppp statistics", which shows number of transmit/received packets. 
> does it mean that the kppp send AT command while in ppp connection ?
> Thank you for your replies,
> Ran