[Help] Any server sources for emulator s2+

Hello!

I going to create new emulator using Rust.

All what I need is open source server example, even with bugs.
I need two variants. First where is all logic in GS. Second with GS,DS,CS etc.
Client for testing stuff.

Question is - which one do you recommend?

My new project at start will be open source as well.
In the coming days I will create a topic and github rep. Where you can follow the progress.

Hoping for your help guys.