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Old April 16th, 2009   #2
Task Group Member
Join Date: Aug 2008
Posts: 369

To be strictly compliant with the example you've given, I think you have to drop the packet and not respond.

Table 6-7 explicitly dis-allows NACKs is response to a Discovery, and according to section 6.3.4:

"The response RESPONSE_TYPE_NACK_REASON shall only be used in conjunction with the

This has always bugged me about how NACK_REASON is defined. If you get some unknown PID, say 0x56, if you strictly follow the standard you can't respond and must drop the packet.

A controller should probably be able to handle the case where an oddball CC gets NACK'd though, just in case.
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