Probably difficult to intercept the packets, but since they're apparently broadcast over the whole hotel network, it would likely be straightforward to send your own out to be mixed in with the real packets and get some sick elevator glitch muzak going.
With custom equipment I bet you could listen for the packet header and broadcast a colliding signal every time a legitimate one was being sent. Since it's UDP, there would be no retry and neither the sender nor the receiver would be the wiser.
