The Hexcape R&D guys have just designed a device to sniff the USB traffic involving a Host and a Device in their communication. DUSBY stands in a "TOTALLY TRANSPARENT WAYbetween an USB host and his USB Device to record what they saythe result of this registration is then shipped via a Fast Ethernet (actually using UDP protocol) port to a  PC to be collected and/or analyzed. DUSBY asks for a 5V 500mA max to be fed, and consists of a TI TM4C1294 Connected LaunchPad. In addition to a bespoke shield, mounted as a "PIGGYBACK", one of our intellectual properties.
Dusby: an USB sniffer platform
The DUSBY represents the easiest, reliablest and cheapest USB sniffing/testing plaform for scientists and engineers involved in USB development systems.