[maemo-developers] WLAN Scanning problem

From: Kalle Valo Kalle.Valo at nokia.com
Date: Wed Mar 14 09:41:44 EET 2007
"kalle ahokangas" <kalleahok at gmail.com> writes:

> I have problem when I perform WLAN scanning when internet connection
> is on. I'm still trying to do an application which scans APs RSSI info
> and then send them to server via internet connection. This requires
> that I have internet connection on (wlan is associated with AP) at the
> same time I'm performing scanning, but when the connection is on RSSI
> information doesn't update properly. Only the associated AP RSSI
> information is uptated!

You scan using wireless extensions directly, right?

> I have investigated the driver code and debugged the situation and I
> get error code -22 from sm_drv_set_scan method from
> sm_drv_ioctl_umac.c at line 1135:
> /* And finally we send the scan request */ ret = sm_drv_oid_set(dev,
> DOT11_OID_SCAN, (void*)&scan, sizeof(int16_t));
> (Do you know where I can find expanations for those errors?)

Sorry, this information is not available for public.

> I hope you can understand the situation. The question is:
> Connection manager scans properly even if the internet connection is
> on so I assume that this scenario is doable. What I have to do to to
> get the scanning to work while internet connection is on? Do I have to
> give some parameters to the driver or what?
> You can see that I'm lost here but I'd appreciate your help very much
> again.

I can't immeaditely say what's wrong. If you are using wireless
extensions, I guess some parameter is missing or something like that.

I think you have two choises:

1. Check how wlancond issues the scan request for the driver and try
   find what it does differently. wlancond is GPL and it's sources are
   in package osso-wlan.

2. Use DBUS interface of wlancond for scanning and you don't need to
   worry about anything. The downside is the the interface is a
   private interface and is subject to change without a warning.

I would recommed option two for you.

Kalle Valo

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