
Later I found another option, "Newlink USB 1.1 CAT5E Booster". They promise to extend limit to 50 meters. I bought and tried it out with 20 meters ethernet cable. Works just fine! I'm not using it in my project but this is good to know, if you need to use Yubikey from far away from PC.
PS. This device uses ethernet cable, but it's just a cable. This device has nothing to do with ethernet. If it would, that would possibly provide another neat way to capture Yubikey-logon directly from network traffic...
In my experience working as a digital operator on pro photoshoots, cables longer than 5m start to have issues 5m is what I and many others I know work to as a maximum without adding repeaters and power boosters etc
VastaaPoista