libratone-rs is a from-scratch implementation of the UDP protocol used to control Libratone speakers, at least the Zipp Mini ones. It comes as a crate that can be used to control the device, and ships a very basic UI as a demonstration.
While the code already implements a number of commands, the code was written as an exercise to practice Rust, and is therefore probably not the most beautiful you'll read. I however use the UI on a daily basis, and it has served me well so far.