Can xAP messages get lost?
Yes, xAP messages can be lost. UDP messages are inherently unreliable in networking terms. Serial networks can suffer from occasional bursts of electrical interference. In practice, in a domestic environment, I have never seen a message get lost. These reassurances may not be sufficient for all control scenarios: In critical control environments, the sender and receiver should be tightly coupled – with the reciever sending an acknowledgement to indicate that an instruction has been performed.