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wpa_supplicant showed signal levels incorrectly with some drivers: Jun 6 16:29:36 rupert wpa_supplicant[18945]: Current BSS: 00:0d:97:11:40:d6 level=190 Jun 6 16:29:36 rupert wpa_supplicant[18945]: Selected BSS: 00:0d:97:11:50:09 level=192 Judging from output from other tools (iwlist) and the min_diff block at the end of wpa_supplicant_need_to_roam, it seems these values should actually be negative. Specifically, if one treats that number as a signed char instead of unsigned, everything matches up. To be honest, I've little to no understanding of wireless, but looking at the source code for wireless-tools (iw_print_stats in iwlib.c), it seems that the fields of the iw_quality struct need to be decoded differently depending on various flags. I guess src/drivers/driver_wext.c should have similar logic in wext_get_scan_qual. I wrote a patch that attempts to replicate some of that logic, although it may be more complicated than is necessary; I think some of the complexity is for backwards-compatibility, which might not be necessary depending on wpa_supplicant's dependencies? In any case, it is attached. Again, I don't know how any of this works, so it's likely the patch is a bit off. But I think at least the logic to determine min_diff in wpa_supplicant_need_to_roam would be more accurate if level were determined correctly.
wpa_supplicant and hostapd v0.6.x --------------------------------- Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi> and contributors All Rights Reserved. These program is dual-licensed under both the GPL version 2 and BSD license. Either license may be used at your option. This package may include either wpa_supplicant, hostapd, or both. See README file respective subdirectories (wpa_supplicant/README or hostapd/README) for more details. Source code files have been moved around in v0.6.x releases and compared to earlier releases, the programs are now build by first going to a subdirectory (wpa_supplicant or hostapd) and creating build configuration (.config) and running 'make' there (for Linux/BSD/cygwin builds).