You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/kanata/example_tcp_client/src
    
    the code of the file until where you have to start completion: use clap::Parser;
use kanata_tcp_protocol::*;
use simplelog::*;
use std::io::{stdin, BufRead, BufReader, Write};
use std::net::{SocketAddr, TcpStream};
use std::process::exit;
use std::time::Duration;

#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
struct Args {
    /// Port that kanata's TCP server is listening on
    #[clap(short, long)]
    port: Option<u16>,

    /// Enable debug logging
    #[clap(short, long)]

    
fn print_usage() {
    log::info!(
        "\n\
    You can also use any other software to connect to kanata over TCP.\n\
    The protocol is plaintext JSON with newline terminated messages.
\n\
    Layer change notifications from kanata look like:\n\
    {}
\n\
    Requests to change kanata's layer look like:\n\
    {}
    ",
        serde_json::to_string(&ServerMessage::LayerChange {
            new: "newly-changed-to-layer".into()
        })
        .expect("deserializable"),
        serde_json::to_string(&ClientMessage::ChangeLayer {
            new: "requested-layer".into()
        })
        .expect("deserializable"),
    )
}