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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 org.fusesource.hawtbuf.DataByteArrayInputStream;
import org.fusesource.hawtbuf.DataByteArrayOutputStream;

import java.io.IOException;
import java.net.ProtocolException;
import java.util.Arrays;
import static org.fusesource.mqtt.codec.MessageSupport.*;

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

    public static final byte[] NO_GRANTED_QOS = new byte[0];
    public static final byte TYPE = 9;

    private short messageId;
    private byte[] grantedQos = NO_GRANTED_QOS;

    public byte messageType() {
        return TYPE;
    }

    public SUBACK decode(MQTTFrame frame) throws ProtocolException {
        assert(frame.buffers.length == 1);
        DataByteArrayInputStream is = new DataByteArrayInputStream(frame.buffers[0]);
        messageId = is.readShort();
        grantedQos = is.readBuffer(is.available()).toByteArray();
        return this;
    }
    
    public MQTTFrame encode() {
        try {
            DataByteArrayOutputStream os = new DataByteArrayOutputStream(2+grantedQos.length);
            os.writeShort(messageId);
            os.write(grantedQos);

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

    public byte[] grantedQos() {
        return grantedQos;
    }

    public SUBACK grantedQos(byte[] grantedQos) {
        this.grantedQos = grantedQos;
        return this;
    }

    public short messageId() {
        return messageId;
    }

    public SUBACK messageId(short messageId) {
        this.messageId = messageId;
        return this;
    }

    @Override
    public String toString() {
        return "SUBACK{" +
                "grantedQos=" + Arrays.toString(grantedQos) +
                ", messageId=" +messageId +
                '}';
    }
}