# coap-rs

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A fast and stable [Constrained Application Protocol(CoAP)](https://tools.ietf.org/html/rfc7252) library implemented in Rust.

Features:
- CoAP core protocol [RFC 7252](https://tools.ietf.org/rfc/rfc7252.txt)
- CoAP Observe option [RFC 7641](https://tools.ietf.org/rfc/rfc7641.txt)
- *Too Many Requests* Response Code [RFC 8516](https://tools.ietf.org/html/rfc8516)
- Block-Wise Transfers [RFC 7959](https://tools.ietf.org/html/rfc7959)
- DTLS support via [webrtc-rs](https://github.com/webrtc-rs/webrtc)
- Option to provide custom transports for client and server

[Documentation](https://docs.rs/coap/)

## Installation

First add this to your `Cargo.toml`:

```toml
[dependencies]
coap = "0.19"
coap-lite = "0.11.3"
tokio = {version = "^1.32", features = ["full"]}
```

## Example

### Server:
```rust
 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:
```rust
 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());
 }
```

## Benchmark
```bash
$ cargo bench
```