because peer to peer -- ie client to client comms is blocked by the AP for security. Smarter wireless controllers allow selective protocol to pass, so you might

because peer to peer -- ie client to client comms is blocked by the AP for security. Smarter wireless controllers allow selective protocol to pass, so you might be able to allow just mDNS (bonjour). Now this is just for wireless peers, it will allow mDNS to work with other wired clients not using that AP. Its a setting that can be modified.