send a binary json message to a udp server in rust

To send a binary JSON message to a UDP server in Rust, you will need to use the std::net::UdpSocket module to create and configure a UDP socket. You will also need to use the serde and serde_json crates to convert your JSON message into a binary format.

Here's an example code snippet that sends a binary JSON message to a UDP server:

main.rs
use serde::{Serialize, Deserialize};
use std::net::UdpSocket;

#[derive(Serialize, Deserialize)]
struct Message {
    content: String,
}

fn main() -> std::io::Result<()> {
    let socket = UdpSocket::bind("127.0.0.1:8000")?;
    let server_addr = "127.0.0.1:9000";

    let message = Message { content: "Hello, UDP server!".to_owned() };
    let json = serde_json::to_vec(&message).expect("failed to serialize message");

    socket.send_to(&json, server_addr)?;

    Ok(())
}
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In this example, we define a Message struct that we want to send to the UDP server. We serialize it to binary JSON format using serde_json::to_vec, and then use UdpSocket::send_to to send the binary JSON message to the server address specified in server_addr.

Note that this code assumes that there is a UDP server listening on 127.0.0.1:9000.