We'd need a *lot* more information about your setup before we can provide any help. There are many different ways you can implement an RDM Responder in software, and the software architecture is usually different for every implementer.
Interrupt Drive vs. Polled
RTOS vs. Bare Metal
Byte-by-Byte vs. Que-and-Evaluate
etc.
There's no one way to do it.
What have you implemented so far? What's working, and what's not working? What tools are you using to debug?
Most implementations start with the ability to receive a packet and validate the checksum. Once you see a valid packet in memory, you can than work out how to respond.
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