package io.netty.child.discard;

/**
 * Keeps sending random data to the specified address.
 */
public class DiscardClient {
	private final String host;
	private final int port;
	private final int firstMessageSize;
	
	public DiscardClient(String host, int port, int firstMessageSize) {
		this.host = host;
		this.port = port;
		this.firstMessageSize = firstMessageSize;
	}
	
	public void run() throws Exception {
		
	}
	
	public static void main(String[] args) throws Exception {
		
	}
}

package io.netty.child.discard;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;

/**
 * Keeps sending random data to the specified address.
 */
public class DiscardClient {
	private final String host;
	private final int port;
	private final int firstMessageSize;
	
	public DiscardClient(String host, int port, int firstMessageSize) {
		this.host = host;
		this.port = port;
		this.firstMessageSize = firstMessageSize;
	}
	
	public void run() throws Exception {
		EventLoopGroup group = new NioEventLoopGroup();
		
		try {
			Bootstrap b = new Bootstrap();
			b.group(group)
			 .channel(NioSocketChannel.class)
			 .handler(new DiscardClientHandler(firstMessageSize));
			
			// Make the connection attempt.
			ChannelFuture f = b.connect(host, port).sync();
			
			// Wait until the connection is closed.
			f.channel().closeFuture().sync();
		}
		finally {
			group.shutdownGracefully();
		}
	}
	
	public static void main(String[] args) throws Exception {
		if(args.length < 2 || args.length > 3) {
			System.err.println("Usage : " + DiscardClient.class.getSimpleName() + " <host> <port> [<first message size>]");
			return;
		}
		
		// Parse options.
		final String host = args[0];
		final int port = Integer.parseInt(args[1]);
		final int firstMessageSize;
		
		if(args.length == 3) {
			firstMessageSize = Integer.parseInt(args[2]);
		}
		else {
			firstMessageSize = 256;
		}
		
		new DiscardClient(host, port, firstMessageSize).run();
	}
}

Add DiscardClient.