Crate coap

Implementation of the [CoAP Protocol][spec].

This library provides both a client interface (CoAPClient) and a server interface (CoAPServer).

Features:

• CoAP core protocol RFC 7252
• CoAP Observe option RFC 7641
• Too Many Requests Response Code RFC 8516
• Block-Wise Transfers RFC 7959
• DTLS support via webrtc-rs
• Option to provide custom transports for client and server
• Client can perform multiple concurrent requests, like observing and sending requests using the same underlying socket

Installation

First add this to your Cargo.toml:

[dependencies]
coap = "0.17"
coap-lite = "0.11.3"
tokio = {version = "^1.32", features = ["full"]}

Then, add this to your crate root:

extern crate coap;

Example

Server:

extern crate coap;

use coap_lite::{RequestType as Method, CoapRequest};
use coap::Server;
use tokio::runtime::Runtime;
use std::net::SocketAddr;
fn main() {
    let addr = "127.0.0.1:5683";
	Runtime::new().unwrap().block_on(async move {
        let mut server = Server::new_udp(addr).unwrap();
        println!("Server up on {}", addr);

        server.run(|mut request: Box<CoapRequest<SocketAddr>>| async {
            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.clone()).unwrap()),
                &Method::Put => println!("request by put {}", String::from_utf8(request.message.payload.clone()).unwrap()),
                _ => println!("request by other method"),
            };
            match request.response {
                Some(ref mut message) => {
                    message.message.payload = b"OK".to_vec();
                },
                _ => {}
            };
            return request
        }).await.unwrap();
    });
}

Client:

extern crate coap;

use coap_lite::{RequestType as Method, CoapRequest};
use coap::{UdpCoAPClient};
use tokio::main;
#[tokio::main]
async fn main() {
    let url = "coap://127.0.0.1:5683/Rust";
    println!("Client request: {}", url);

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

Re-exports

• pub use self::client::UdpCoAPClient;
• pub use self::server::Server;

Modules

• client
• dtls
  this file is included by enabling the “dtls” feature. It provides a default DTLS backend using webrtc-rs’s dtls implementation.
• request
• server

Structs

• Observer