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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.*;

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

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

    public static final byte TYPE = 2;

    public static enum Code {
        CONNECTION_ACCEPTED,
        CONNECTION_REFUSED_UNACCEPTED_PROTOCOL_VERSION,
        CONNECTION_REFUSED_IDENTIFIER_REJECTED,
        CONNECTION_REFUSED_SERVER_UNAVAILABLE,
        CONNECTION_REFUSED_BAD_USERNAME_OR_PASSWORD,
        CONNECTION_REFUSED_NOT_AUTHORIZED;
    }

    private Code code = Code.CONNECTION_ACCEPTED;
    
    public byte messageType() {
        return TYPE;
    }

    public CONNACK decode(MQTTFrame frame) throws ProtocolException {
        assert(frame.buffers.length == 1);
        DataByteArrayInputStream is = new DataByteArrayInputStream(frame.buffers[0]);
        is.skip(1);
        byte c = is.readByte();
        if( c >= Code.values().length ) {
            throw new ProtocolException("Invalid CONNACK encoding");
        }
        code = Code.values()[c];
        return this;
    }
    
    public MQTTFrame encode() {
        try {
            DataByteArrayOutputStream os = new DataByteArrayOutputStream(2);
            os.writeByte(0);
            os.writeByte(code.ordinal());

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

    public Code code() {
        return code;
    }

    public CONNACK code(Code code) {
        this.code = code;
        return this;
    }

    @Override
    public String toString() {
        return "CONNACK{" +
                "code=" + code +
                '}';
    }
}