// receives and prints discovery announcements
func recv(bc beacon.Interface) {
seen := make(map[string]bool)
for {
data, src := bc.Recv()
if m := binary.BigEndian.Uint32(data); m != discover.Magic {
log.Printf("Incorrect magic %x in announcement from %v", m, src)
continue
}
var ann discover.Announce
ann.Unmarshal(data[4:])
if ann.ID == myID {
// This is one of our own fake packets, don't print it.
continue
}
// Print announcement details for the first packet from a given
// device ID and source address, or if -all was given.
key := ann.ID.String() + src.String()
if all || !seen[key] {
log.Printf("Announcement from %v\n", src)
log.Printf(" %v at %s\n", ann.ID, strings.Join(ann.Addresses, ", "))
seen[key] = true
}
}
}
