The STATUS_MESSAGES data format described in E1.20-2010 section 10.3.2 is enclosed in the general packet format described in section 6.2. That enclosing packet has the responder's UID included.
Status messages (and queued messages) are more of an advanced feature for RDM. They are not required for basic operation. In fact, many simple responders don't implement status messages at all. Rather than focusing on Status Messages right away, you may want to get the rest of your responder working, then go back and add status message support once you have that foundation to build on.
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