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mqtt-client provides an ASL 2.0 licensed API to MQTT. It takes care of automatically reconnecting to your MQTT server and restoring your client session if any network failures occur. Applications can use a blocking API style, a futures based API, or a callback/continuations passing API style.
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/**
 * Copyright (C) 2010-2012, FuseSource Corp.  All rights reserved.
 *
 *     http://fusesource.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.fusesource.mqtt.codec;

import java.io.IOException;
import java.net.ProtocolException;

import static org.fusesource.mqtt.codec.MessageSupport.Message;
import org.fusesource.hawtbuf.DataByteArrayInputStream;
import org.fusesource.hawtbuf.DataByteArrayOutputStream;
import org.fusesource.hawtbuf.UTF8Buffer;
import org.fusesource.mqtt.client.QoS;

/**
 * 
 * 
 *
 * @author Hiram Chirino
 */
public class CONNECT implements Message {

    public static final byte TYPE = 1;
    
    private static final UTF8Buffer V3_PROTOCOL_NAME = new UTF8Buffer("MQIsdp");
    private static final UTF8Buffer V4_PROTOCOL_NAME = new UTF8Buffer("MQTT");

    private short keepAlive = 30;
    private UTF8Buffer clientId;
    private UTF8Buffer willTopic;
    private UTF8Buffer willMessage = new UTF8Buffer("");
    private boolean willRetain;
    private byte willQos;
    private boolean cleanSession = true;
    private UTF8Buffer userName;
    private UTF8Buffer password;
    private int version = 3;


    public CONNECT(){
    }

    public CONNECT(CONNECT other) {
        this.keepAlive = other.keepAlive;
        this.clientId = other.clientId;
        this.willTopic = other.willTopic;
        this.willMessage = other.willMessage;
        this.willRetain = other.willRetain;
        this.willQos = other.willQos;
        this.cleanSession = other.cleanSession;
        this.userName = other.userName;
        this.password = other.password;
        this.version = other.version;
    }

    public byte messageType() {
        return TYPE;
    }

    public CONNECT decode(MQTTFrame frame) throws ProtocolException {
        assert(frame.buffers.length == 1);
        DataByteArrayInputStream is = new DataByteArrayInputStream(frame.buffers[0]);

        UTF8Buffer protocolName = MessageSupport.readUTF(is);
        if (V4_PROTOCOL_NAME.equals(protocolName)) {
            version = is.readByte() & 0xFF;
            if( version < 4 ) {
                throw new ProtocolException("Invalid CONNECT frame: protocol name/version mismatch");
            }
        } else if( V3_PROTOCOL_NAME.equals(protocolName) ) {
            version = is.readByte() & 0xFF;
            if( version != 3 ) {
                throw new ProtocolException("Invalid CONNECT frame: protocol name/version mismatch");
            }
        } else {
            throw new ProtocolException("Invalid CONNECT frame");
        }

        byte flags = is.readByte();
        boolean username_flag = (flags & 0x80) > 0;
        boolean password_flag = (flags & 0x40) > 0;
        willRetain = (flags & 0x20) > 0;
        willQos = (byte) ((flags & 0x18) >>> 3);
        boolean will_flag = (flags & 0x04) > 0;
        cleanSession = (flags & 0x02) > 0;

        keepAlive = is.readShort();
        clientId = MessageSupport.readUTF(is);
        if( clientId.length == 0 ) {
            clientId = null;
        }
        if(will_flag) {
            willTopic = MessageSupport.readUTF(is);
            willMessage = MessageSupport.readUTF(is);
        }
        if( username_flag ) {
            userName = MessageSupport.readUTF(is);
        }
        if( password_flag ) {
            password = MessageSupport.readUTF(is);
        }
        return this;
    }
    
    public MQTTFrame encode() {
        try {
            if( (clientId==null || clientId.length == 0) && !cleanSession ) {
                throw new IllegalArgumentException("A clean session must be used when no clientId is specified");
            }
            DataByteArrayOutputStream os = new DataByteArrayOutputStream(500);
            if(version==3) {
                MessageSupport.writeUTF(os, V3_PROTOCOL_NAME);
                os.writeByte(version);
            } else if(version >= 4) {
                MessageSupport.writeUTF(os, V4_PROTOCOL_NAME);
                os.writeByte(version);
            } else {
                throw new IllegalArgumentException("Invalid version: "+version);
            }

            int flags = 0;
            if(userName!=null) {
                flags |= 0x80;
            }
            if(password!=null) {
                flags |= 0x40;
            }
            if(willTopic!=null && willMessage!=null) {
                flags |= 0x04;
                if(willRetain) {
                    flags |= 0x20;
                }
                flags |= (willQos << 3) & 0x18;
            }
            if(cleanSession) {
                flags |= 0x02;
            }
            os.writeByte(flags);
            os.writeShort(keepAlive);
            MessageSupport.writeUTF(os, clientId);
            if(willTopic!=null && willMessage!=null) {
                MessageSupport.writeUTF(os, willTopic);
                MessageSupport.writeUTF(os, willMessage);
            }
            if(userName!=null) {
                MessageSupport.writeUTF(os, userName);
            }
            if(password!=null) {
                MessageSupport.writeUTF(os, password);
            }

            MQTTFrame frame = new MQTTFrame();
            frame.commandType(TYPE);
            return frame.buffer(os.toBuffer());
        } catch (IOException e) {
            throw new RuntimeException("The impossible happened");
        }
    }

    public boolean cleanSession() {
        return cleanSession;
    }

    public CONNECT cleanSession(boolean cleanSession) {
        this.cleanSession = cleanSession;
        return this;
    }

    public UTF8Buffer clientId() {
        return clientId;
    }

    public CONNECT clientId(UTF8Buffer clientId) {
        this.clientId = clientId;
        return this;
    }

    public short keepAlive() {
        return keepAlive;
    }

    public CONNECT keepAlive(short keepAlive) {
        this.keepAlive = keepAlive;
        return this;
    }

    public UTF8Buffer password() {
        return password;
    }

    public CONNECT password(UTF8Buffer password) {
        this.password = password;
        return this;
    }

    public UTF8Buffer userName() {
        return userName;
    }

    public CONNECT userName(UTF8Buffer userName) {
        this.userName = userName;
        return this;
    }

    public UTF8Buffer willMessage() {
        return willMessage;
    }

    public CONNECT willMessage(UTF8Buffer willMessage) {
        this.willMessage = willMessage;
        return this;
    }

    public QoS willQos() {
        return QoS.values()[willQos];
    }

    public CONNECT willQos(QoS willQos) {
        this.willQos = (byte) willQos.ordinal();
        return this;
    }

    public boolean willRetain() {
        return willRetain;
    }

    public CONNECT willRetain(boolean willRetain) {
        this.willRetain = willRetain;
        return this;
    }

    public UTF8Buffer willTopic() {
        return willTopic;
    }

    public CONNECT willTopic(UTF8Buffer willTopic) {
        this.willTopic = willTopic;
        return this;
    }

    public int version() {
        return version;
    }

    public CONNECT version(int version) {
        if(version==3) {
            this.version = version;
        } else if(version >= 4) {
            this.version = version;
        } else {
            throw new IllegalArgumentException("Invalid version: "+version);
        }
        return this;
    }

    @Override
    public String toString() {
        return "CONNECT{" +
                "cleanSession=" + cleanSession +
                ", keepAlive=" + keepAlive +
                ", clientId=" + clientId +
                ", willTopic=" + willTopic +
                ", willMessage=" + willMessage +
                ", willRetain=" + willRetain +
                ", willQos=" + willQos +
                ", userName=" + userName +
                ", password=" + password +
                '}';
    }
}