wpa_supplicant: signal strength
pradeep.sengar at gmail.com
Sat Aug 26 05:21:47 EDT 2006
Thanks for your reply.
But can you please give me a pointer as to how to use WE directly to get the
On 8/25/06, Dan Williams <dcbw at redhat.com> wrote:
> On Fri, 2006-08-25 at 19:05 +0530, Pradeep Sengar wrote:
> > Hi,
> > I am having a wi-fi application to show the signal strength . From
> > wpa_supplicant I get the RSSI value in dBm. Now, the dBm range is
> > different for different AP's. How do I convert the signal strength
> > value in a range?
> It's different for every card. Wireless Extensions specifies signal
> strength in either RSSI or dBm, and the driver must specify a noise
> floor in the same units. If you're given dBm by the driver (or by
> wpa_supplicant) you can use the noise floor as your lower value for the
> range, but remember that the scale is not necessarily linear.
> Furthermore, drivers these days are _very_ bad at reporting signal
> strength in any standardized fashion, and drivers also have
> discrepancies between a scanned AP's strength and the strength when
> you're associated to that AP.
> You may have to use WE directly rather than wpa_supplicant to get the
> information you need.
> > Regards
> > Pradeep
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