CTAPHID_MSG for U2F command

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Ujjwal Roy

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Oct 8, 2024, 3:00:44 AMOct 8
to FIDO Dev (fido-dev)
The format for sending U2F command through USB is as following 
Request
CMD         CTAPHID_MSG
BCNT         1..(n + 1)
DATA         U2F command byte
DATA + 1 n bytes of data

For U2F authenticate command, how to pass control byte. Will it be part of  DATA + 1 n bytes of data? 
This is not clearly specified in  FIDO U2F Raw Message Formats or  FIDO U2F HID Protocol Specification.

Regards
Ujjwal Roy
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