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diff --git a/tradeshow/iot-sensortag/mqttupdate.h b/tradeshow/iot-sensortag/mqttupdate.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of Qt for Device Creation.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef MQTTUPDATE_H
+#define MQTTUPDATE_H
+
+#include <QObject>
+#include <QTimer>
+
+class DataProviderPool;
+class SensorTagDataProvider;
+class QMqttClient;
+
+//#define MQTT_TIMER_BASED_PUBLISH 1
+
+class MqttEventHandler : public QObject
+{
+    Q_OBJECT
+public:
+    explicit MqttEventHandler(const QString &name, QObject *parent = 0);
+    ~MqttEventHandler();
+    DataProviderPool *m_providerPool;
+public slots:
+    void uploadGyro();
+    void uploadTemperature();
+    void uploadHumidity();
+    void uploadLight();
+    void uploadAltitude();
+    void uploadBarometer();
+    void uploadAccelerometer();
+    void uploadMagnetometer();
+    void uploadRotation();
+
+    void clientConnected();
+    void sendAlive();
+
+private:
+    QString m_deviceName;
+    QString m_topicPrefix;
+    QMqttClient *m_client;
+    QTimer m_pingTimer;
+};
+
+class MqttUpdate : public QObject
+{
+    Q_OBJECT
+public:
+    explicit MqttUpdate(QObject *parent = 0);
+
+    void setDataProviderPool(DataProviderPool *provider);
+
+    int updateInterval() const;
+    void setUpdateInterval(int interval);
+    void restart();
+    void stop();
+
+#ifdef MQTT_TIMER_BASED_PUBLISH
+protected:
+    void timerEvent(QTimerEvent* event);
+    virtual void writeToCloud();
+#else
+#endif
+
+protected:
+    DataProviderPool *m_providerPool;
+private:
+    QThread *m_handlerThread;
+    MqttEventHandler *m_handler;
+    int m_updateInterval;
+#ifdef MQTT_TIMER_BASED_PUBLISH
+    int m_timerId;
+#endif
+};
+
+#endif // MQTTUPDATE_H