Fix compatibility with some IoT devices using avahi 0.8-rc1 (grandcat#27

)

* Fix compatibility with avahi 0.8-rc1

This fixes browse, lookup and also register not working properly with devices running with avahi 0.8-rc1

* Fix linter warning

* Also set IPv6 HopLimit

connection.go

@@ -62,6 +62,8 @@ func joinUdp6Multicast(interfaces []net.Interface) (*ipv6.PacketConn, error) {
 		return nil, fmt.Errorf("udp6: failed to join any of these interfaces: %v", interfaces)
 	}
 
+	_ = pkConn.SetMulticastHopLimit(255)
+
 	return pkConn, nil
 }
 
@@ -93,6 +95,8 @@ func joinUdp4Multicast(interfaces []net.Interface) (*ipv4.PacketConn, error) {
 		return nil, fmt.Errorf("udp4: failed to join any of these interfaces: %v", interfaces)
 	}
 
+	_ = pkConn.SetMulticastTTL(255)
+
 	return pkConn, nil
 }