MPP? It's easy as, 123. As simple as, do re mi.
Minecraft packet protocols can be found here. Currently based on Minecraft version 1.16.5 (latest as of time of writing)
If you 'd like to help with this project, please take a look at the to-do board. Grab one of the bite-sized tasks from near the top of the "To-Do" column, and open up a PR once it's complete!
To build the executable JAR file, run mvn package.
To run the tests, run mvn test.