On Monday 19 March 2007 15:57, Andy Green wrote: > Hi folks - > > If you could generate and manage powersave protocol frames to an AP from > the mac80211 stack, without actually putting the radio to sleep, you > could do some interesting things. > Like in my scanning patch series? http://news.gmane.org/find-root.php?group=gmane.linux.kernel.wireless.general&article=770 This requires a bit of kernel side support to queue up frames on the client side to maintain the illusion that nothing happened. (except for a brief latency jump) However, it does seem to work for the wireless cards I've tested. Doing scanning like this in userspace will require some sort of interface to stop/restart the TX for the appropriate network interfaces, but will probably make your multichannel association idea possible. As for how long the AP will hold your frames.. 802.11 defines a minimum time, but the maximum depends on the AP. -Michael Wu
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