wpa_cli returns signal strength 0-255 ?

Ed W lists
Sun Nov 6 01:56:00 PST 2011

Hi, using the git-1.0rc tree I observe that scan_results returns signal
strength in a form that looks like 0-255.  Is this expected? How to
convert to db or other arbitrary scale for use by a frontend?

bssid / frequency / signal level / flags / ssid
90:84:0d:df:99:17    2452    229    [WPA2-PSK-CCMP][ESS]    WILDGOOSES
00:0b:6b:23:7e:1c    2412    203   
00:22:6b:86:39:32    2472    179    [WPA2-PSK-CCMP][ESS]    Eddie
a0:21:b7:55:bc:28    2432    177   
[WPA-PSK-TKIP+CCMP][WPA2-PSK-TKIP+CCMP][ESS]    virginmedia5009023
30:46:9a:7e:e9:5e    2412    177   
[WPA-PSK-TKIP+CCMP][WPA2-PSK-TKIP+CCMP][ESS]    virginmedia2026976
00:0b:6b:23:7e:1d    2412    203    [ESS]    MyRedbox_open
00:19:2f:f2:48:f0    2417    177    [ESS]

Additionally, I am using an Atheros AR5414 card with recent kernel
drivers.  Is there any way to have the card periodically do a background
scan such that scan_results are always reasonably fresh?

Thanks for any thoughts

Ed W
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