Add listener to the multicast address

It seems at least the latest update of the Apple TV OS only responds to mdns requests by sending a new broadcast to 224.0.0.251, no direct response is made to the originating device:


$ sudo tcpdump -n udp port 5353
22:44:19.870618 IP 10.0.1.5.56437 > 224.0.0.251.5353: 0 PTR (QM)? _airplay._tcp.local. (37)
22:44:20.250040 IP 10.0.1.3.5353 > 224.0.0.251.5353: 0*- [0q] 1/0/4 PTR Apple TV._airplay._tcp.local. (309)
22:44:20.250650 IP6 fe80::c7a:22b5:cd2a:ae0e.5353 > ff02::fb.5353: 0*- [0q] 1/0/4 PTR Apple TV._airplay._tcp.local. (309)