Architecture
Different devices communicate using xPL within a local network. They all broadcast their messages on the IANA registered UDP port 3865 for the other devices to handle.
As on modern operating systems only one program can listen to a given port, there is a need for a hub forwarding the messages to all devices on the same machine. The devices register to the hub on a private UDP port and the hub then forwards all incoming message to these private ports.
Read more about this topic: XPL Protocol
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