No examples

[vi]

There should be something like a no_std TCP echo server example.

[jbg]

This crate doesn't contain a pure Rust TCP implementation; it just contains the parts of std::net (mostly address types) that don't depend on the rest of std.

Without std, you don't have sockets, so you'd need to look elsewhere (e.g. https://github.com/m-labs/smoltcp) if you want to make a no_std TCP server.