coap-rs

A fast and stable Constrained Application Protocol(CoAP) library implemented in Rust.

Features:

• CoAP core protocol RFC 7252
• CoAP Observe option RFC 7641
• Too Many Requests Response Code RFC 8516

Documentation

Installation

First add this to your Cargo.toml:

[dependencies]
coap = "0.8"

Example

Server:

#![feature(async_closure)]

use coap::{Server, IsMessage, Method};
use tokio::runtime::Runtime;

fn main() {
    let addr = "127.0.0.1:5683";

    Runtime::new().unwrap().block_on(async move {
        let mut server = Server::new(addr).unwrap();
        println!("Server up on {}", addr);
        
        server.run(async move |request| {
            match request.get_method() {
                &Method::Get => println!("request by get {}", request.get_path()),
                &Method::Post => println!("request by post {}", String::from_utf8(request.message.payload).unwrap()),
                &Method::Put => println!("request by put {}", String::from_utf8(request.message.payload).unwrap()),
                _ => println!("request by other method"),
            };
            
            return match request.response {
                Some(mut message) => {
                    message.set_payload(b"OK".to_vec());
                    Some(message)
                },
                _ => None
            };
        }).await.unwrap();
    });
}

Client:

use coap::{CoAPClient, CoAPResponse};

fn main() {
    let url = "coap://127.0.0.1:5683/Rust";
    println!("Client request: {}", url);

    let response = CoAPClient::get(url).unwrap();
    println!("Server reply: {}", String::from_utf8(response.message.payload).unwrap());
}

Benchmark

$ cargo bench