This is interesting enough I want to look into it if nothing else than for the geek/cool factor, but the thing I like about gRPC is it gives me layer I can let

This is interesting enough I want to look into it if nothing else than for the geek/cool factor, but the thing I like about gRPC is it gives me layer I can let my client consume as an API (although REST is likely sufficient for this). I actually have an internal API and then two little shim/wrapper layers over the top: one for gRPC and one for REST. My UI consumes the gRPC API. I also want my Rust server to have an independent lifetime from the UI so it can do work in the background. I suspect my use case is just a little different. NOTE: I found this crate that would likely help with Dart codegen of message types: https://crates.io/crates/serde-generate https://crates.io/crates/serde-generate. While stdin/out wouldn't likely work for me, I could use a TCP socket bound to localhost or named pipe as alternative for the transport piece.