A USB to serial convertor using a Prolific or FTDI chip will not implement CDC ACM class, these use vendor specific classes, so they won't work with the USB Host CDC ACM class. I have used the USB Host CDC ACM class on Synergy to communicate with another Synergy board using CDC ACM device class, and had no issues, it just worked, no hacking required. It was a while ago that I had this setup working, so I will have to have a look at the projects again.
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