What are you setting your baud rates to? Are you actually getting a useful link through the relay?
Were you able to set the retries to 0? I could only set it to 1.
How did you flash your Asynchronous firmware your RFD900x radios? Using the RFD900 tools (version 2.11)? What Async version did you flash (v2.47)?
Did you have success getting this to work with three nodes? Cheers!
Did you solve your problem?