Explore the intricacies of writing a userspace driver for USB human-interface devices in Rust using mio in this informative 24-minute conference talk. Gain insights into reverse-engineering undocumented HID protocols and MIDI devices, and learn about the process of creating efficient drivers. Discover techniques for handling unsafe code and managing latency issues. The presentation covers key topics including introduction to the subject, reverse engineering methods, using Wireshark for analysis, driver programming techniques, and addressing questions from the audience.