thank you for your quick and clear reply.
I understand the special interest in waking up clients
e.g. for all kinds of maintenance activities.
And I could also notice, that the interest to wake up
the accesspoint itself by a client being interested in service has not been
mentioned publicly. Nevertheless my interest still persists and a solution for
my issue could be helpful for others as well.
I understand, that in order to be wakeable a client
must stay connected with the accesspoint. The client is evidently able to maintain
connectivity using 5Vsb (5V standby voltage). With what I know it seems
thinkable that an accesspoint could also use 5Vsb to continue performing its
routine task of sending beacon frames and providing support for the clients to
maintain connection. If that would be achievable with firmware means only, i.e.
without SW support, then it would also seem thinkable to react on wake up
events, exactly as clients do with the same HW and possibly firmware. Whether
this is true was the fundamental question of my initial mail.
Besides there have been other questions in my initial
mail, where answers would still be desirable and where for sure there are
expert participants in the hostap mailing list who have knowledge and are
possibly prepared to give helpful answers. I take the freedom to repeat them
1. Has ath9k become ready and stable for usage in a
Linux based accesspoint?
(hostap documents say, that madwifi is required, can madwifi be substituted
2. What WLAN-Adapters supported by ath9k are
available, with capabilities for WOWLAN (at least for clients)?
3. Can a WLAN Client wake up its accesspoint over
WLAN (see my reasoning above)?
4. Can wake up be performed with both Magic Packet
and Special Pattern (at least for waking up clients)?
Many thanks again for kind and helpful answers from
anybody being knowledgeable in these topics.
>From: Johannes Berg
[mailto:johannes <at> sipsolutions.net]
>Sent: Samstag, 26. Februar 2011
>To: karl <at> krothenhoefer.de
>Cc: hostap <at> lists.shmoo.com
>Subject: Re: Wake Accesspoint over
>On Fri, 2011-02-25 at 22:50 +0100, Karl Rothenhöfer wrote:
>> I want to implement a Wireless server based on Linux. If idle
>> for a longer time I would like the server to shutdown to
>> order to save energy; and I would like to wake up the server
>> (WOWLAN) by clients requesting service.
>WoWLAN typically supports only clients staying connected to an AP
>suspended and then being woken up.