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u/OP if you want to use unix/tcp socket directly check out https://crates.io/crates/remoc it works over both and is a WAY better idea then http...
Wayland is itself an IPC system (that uses UNIX domain sockets). I would make a custom Wayland protocol (if there isn't already an appropriate one available, look here: https://wayland.app/protocols/). You can define the protocol in XML and generate the boilerplate code in C using wayland-scanner. I assume smithay also has an equivalent of wayland-scanner.
I have done the exact same thing but for X11, feel free to take a look at the project if you want here, I was very happy with the communication between the client and the wm.