Cargo.toml

[package]
name = "ws-test"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
tokio = { version = "1.18.0", features = ["full"] }
jsonrpsee = { version = "0.11.0", features = ["full"] }
url = "2.2.2"

main.rs

use jsonrpsee::ws_client::WsClientBuilder;
use tokio::sync::broadcast;

#[tokio::main]
async fn main() {
    let addr = "wss://kusama-rpc.polkadot.io";
    let port_number = "443";
    println!("Using port number {}", port_number);
    let url = format!("wss://{addr}:{port_number");
    println!("The url is {url}");

    let client = WsClientBuilder::default().build(&url).await.unwrap();
}