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DTLS Java Async Implementation Based on Bouncy Castle

There is a newer version: 1.0.19

package com.mobius.software.iot.dal.crypto;

/**
 * Mobius Software LTD
 * Copyright 2018, Mobius Software LTD
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.net.SocketAddress;
import java.security.KeyStore;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

import org.bouncycastle.crypto.tls.AlertDescription;
import org.bouncycastle.crypto.tls.AlertLevel;
import org.bouncycastle.crypto.tls.TlsFatalAlert;

import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.socket.DatagramPacket;
import io.netty.handler.codec.MessageToMessageDecoder;

public class AsyncDtlsServerHandler extends MessageToMessageDecoder
{
	private AsyncDtlsServerContextMap map;
	private KeyStore keystore;
	private String keystorePassword;
	private ConcurrentHashMap channels;
	private DtlsStateHandler handler;
	
	public AsyncDtlsServerHandler(KeyStore keystore,String keystorePassword,AsyncDtlsServerContextMap map,ConcurrentHashMap channels,DtlsStateHandler handler)
	{
		this.map=map;
		this.keystore=keystore;
		this.keystorePassword=keystorePassword;
		this.channels=channels;
		this.handler=handler;
	}
	
	@Override
	protected void decode(ChannelHandlerContext ctx, DatagramPacket packet,List