Ok, it is much easier to proceed having all those details available.
What you actually see is Simple Service Discovery Protocol (SSDP) message. (Wikipedia)
brvread is an old name, came from IANA and used by Wireshark.
This port is also associated with AckCmd trojan. Interesting fact:
The interesting feature about this backdoor is that it only uses ACK packets. This means that a standard connection is not established; rather, data will be transmitted directly using ACK packets. This makes it possible for the Trojan to bypass some firewalls.
So I think the actual explanation is quite trivial: some other service sits on that port and talks SSDP.