The "GET QUEUED_MESSAGES" request is sent to the root device, but the response can come from any sub-device.
For example, if the user changes the DMX Address of two sub-devices, then the responder would set it's message count to 2. When the controller sends a GET QUEUED_MESSAGES to the root, it would send the new DMX address for the first sub-device. The next GET QUEUED_MESSAGES would return the new DMX address for the second sub-dev.
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