NR_BUFFER_FULL is for when the target responder has no buffer space available.
NR_PROXY_BUFFER_FULL is for when the proxy, or some other in-line device between the controller and the target responder is out of buffer space.
So, in the system consisting of:
Console -----> RDM to RDM Proxy ------> Moving Light
If the console is sending a packet to the moving light, and the moving light can't handle the message, the moving light would send NR_BUFFER_FULL.
If the console is sending a packet to the moving light, and the proxy can't handle the message, the proxy would send NR_PROXY_BUFFER_FULL.
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