stunclient 0.4.2

Simple STUN client for resolving external IP address and port of a UDP socket
Documentation 
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use stunclient::StunClient;

#[cfg(not(feature="async"))]
fn main() { println!("Cargo feature not enabled for this example"); }

#[cfg(feature="async")]
#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<(), ()> {
    let args : Vec<_> = std::env::args().collect();
    if args.len() > 2 || args.get(1).map(|x|&x[..]) == Some("--help") {
        eprintln!("Usage: client [stun_server_socket_address]");
        return Err(());
    }
    let sc = if let Some(x) = args.get(1) {
        if let Ok(xx) = x.parse() {
            StunClient::new(xx)
        } else {
            eprintln!("Failed to parse socket address");
            return Err(());
        }
    } else {
        StunClient::with_google_stun_server()
    };

    let u = tokio::net::UdpSocket::bind(&"0.0.0.0:0".parse::<std::net::SocketAddr>().unwrap()).await.unwrap();

    let ret = sc.query_external_address_async(&u);

    match ret.await {
        Ok(x) => println!("{}", x),
        Err(e) => {
            eprintln!("{}", e);
            return Err(());
        }
    }
    Ok(())
}