No association with no encryption

I have an application where the AP needs to broadcast information freely 
to clients without any pre-association. I'd use the beacons, but the 
wifi chips make that difficult.

I need to broadcast without encryption, but I don't want to have an open 
access point that could be a security problem. So I want to prevent 
clients from forming an association. Rather the client just sniffs for 
the right broadcast packet to get the information they need. This is 
somewhat the opposite problem from those who want encryption with no 
password.

Is it sufficient to set up hostapd with no WPA, but not run dnsmasq, and 
disallow routing at the AP? Or is there a clean way to set up the 
hostapd.conf to not encrypt but disallow associations, short of 
modifying the hostapd source code to disallow associations?

Thanks,

     Mary Ann



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