The usb packet specification says a badge transfer! I work with the device as with the file, that is ReadFile WriteFile. How do I send a Marker Out to an isochronous transfer device?

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    This is done by hardware / driver / OS, you just need to write to the file. It is impossible to change the mode of operation, for example, from bulk to isochronous — the device itself reports with descriptors what endpoints it has and in what modes they work. A special option is if the device has several endpoints with different transmission modes and allows selection at the user level, then look at the description of how to send data to a specific endpoint (this could be another USB logical device, or special IO control commands) . - Vladimir Gamalyan

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