Re: nm api to get essid, freq, qual ...

["tyuoustwo three" <dunkineigen gmail com>]

On Fri, May 2, 2008 at 12:10 PM, Dan Williams <dcbw redhat com> wrote:

On Fri, 2008-05-02 at 04:03 -0400, tyuoustwo three wrote:
> Hi,
>
> I have already looked at
> http://lists.shmoo.com/pipermail/hostap/2007-December/016761.html
> message.
>
> I would like to know, if  api's in nm-device-802-11-wireless.c in
> NetworkManager/src or nm-device-802-11-wireless.c in
> NetworkManager/libnm-glib can be used to get essid, frequency and
> quality.

They are accessible both from libnm-glib and from D-Bus, since
libnm-glib is really just a client-side wrapper around the D-Bus
interface that NM exposes.

You can also query wpa_supplicant for this information directly.

Are you looking for information about which AP the machine is
_currently_ associated with, or information about some random known AP
that the machine is _not_ currently associated with?

I am looking for information about AP that the machine can "scan" (just as in "iwlist ath0 scan").
 

> I am trying to overlay network information (essid, freq ...) on a live
> video stream.
> Using "system(iwlist ath0 scan | grep ESSID > net_info.txt)"  and
> then

This is going to just kill you, because you're scanning for networks,
which can take more than 10 seconds on cards that support both the A and
B/G frequency bands, using a passive scan (which is the default).  You
really, really don't want to trigger a scan every frame.

Yes, I will have to try to introduce delay between each scan.
 

So first I'll need to know if you want info about the current associated
AP or a known but not currently associated AP.  That makes a big
difference in the approach you should take.

I am looking for an output similar to "iwlist ath0 scan", but I need only certain information like essid, freq, qual.

Also, we do not need every possible AP that the card can scan. But, only the top 3 or 4 AP (this can be less or more), based on the quality or signal.

Dan

> reading the file each millisecond or less takes a lot of time. (For
> each single video frame using "system" command to get network
> parameters and then overlaying text makes the live video really
> slow).
>
> So, looking for an api that directly provides the required wireless
> network parameters.
>
> Thanks,
>
> Ash

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