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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.client;

import org.fusesource.mqtt.codec.MQTTFrame;

/**
 * A subclass of this can be configured on an MQTT connection to
 * get more insight into what it's doing.
 */
public class Tracer {

    /**
     * Override to log/capture debug level messages
     * @param message
     * @param args
     */
    public void debug(String message, Object...args) {
    }

    /**
     * Called when a MQTTFrame sent to the remote peer.
     * @param frame
     */
    public void onSend(MQTTFrame frame) {
    }

    /**
     * Called when a MQTTFrame is received from the remote peer.
     * @param frame
     */
    public void onReceive(MQTTFrame frame) {
    }

}