During the initial brainstorming session there was a discussion of "Topology Mapping" PIDs, which is similar to what you are describing. Rather than "Last Active Port", PID the idea was to have a "GET UID Port" PID that would tell you what port a specific UID is attached to.
The problem with "Last Active Port" is that it can give in accurate results in a system with more than one controller generating requests (as you might find with an RDM Merger or E1.33 style system).
However, during the initial discussion, there seemed to be relatively little interest in Topology Mapping PIDs. Who else is interested in having such a feature?
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