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+/****************************************************************************
+**
+** Copyright (C) 2018 basysKom GmbH, opensource@basyskom.com
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the QtOpcUa module.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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 OPCUAMACHINEBACKEND_H
+#define OPCUAMACHINEBACKEND_H
+
+#include <QtOpcUa>
+
+#include <QObject>
+
+class OpcUaMachineBackend : public QObject
+{
+    Q_OBJECT
+
+public:
+
+    enum class MachineState : quint32 {
+        Idle,
+        Pumping,
+        Flushing
+    };
+    Q_ENUM(MachineState)
+
+    Q_PROPERTY(double percentFilledTank1 READ percentFilledTank1 NOTIFY percentFilledTank1Changed)
+    Q_PROPERTY(double percentFilledTank2 READ percentFilledTank2 NOTIFY percentFilledTank2Changed)
+    Q_PROPERTY(double tank2TargetPercent READ tank2TargetPercent NOTIFY tank2TargetPercentChanged)
+    Q_PROPERTY(OpcUaMachineBackend::MachineState machineState READ machineState NOTIFY machineStateChanged)
+    Q_PROPERTY(bool tank2ValveState READ tank2ValveState NOTIFY tank2ValveStateChanged)
+    Q_PROPERTY(bool connected READ connected NOTIFY connectedChanged)
+    Q_PROPERTY(QString machineDesignation READ machineDesignation NOTIFY machineDesignationChanged)
+    Q_PROPERTY(QString message READ message NOTIFY messageChanged)
+    Q_PROPERTY(QStringList backends READ backends NOTIFY backendsChanged)
+
+    OpcUaMachineBackend(QObject *parent = nullptr);
+    ~OpcUaMachineBackend();
+
+    double percentFilledTank1() const;
+    double percentFilledTank2() const;
+    double tank2TargetPercent() const;
+    bool tank2ValveState() const;
+    MachineState machineState() const;
+    bool connected() const;
+    QString machineDesignation() const;
+    QString message() const;
+    bool successfullyCreated() const;
+    void setMessage(const QString &message);
+    QStringList backends() const;
+
+    Q_INVOKABLE void connectToEndpoint(const QString &url, qint32 index);
+    Q_INVOKABLE void disconnectFromEndpoint();
+    Q_INVOKABLE void machineWriteTank2TargetPercent(double value);
+    Q_INVOKABLE void startPump();
+    Q_INVOKABLE void stopPump();
+    Q_INVOKABLE void flushTank2();
+    Q_INVOKABLE void resetSimulation();
+
+public slots:
+    void clientStateHandler(QOpcUaClient::ClientState state);
+    void machineStateUpdated(QOpcUa::NodeAttribute attr, const QVariant &value);
+    void percentFilledTank1Updated(QOpcUa::NodeAttribute attr, const QVariant &value);
+    void percentFilledTank2Updated(QOpcUa::NodeAttribute attr, const QVariant &value);
+    void tank2TargetPercentUpdated(QOpcUa::NodeAttribute attr, const QVariant &value);
+    void tank2ValveStateUpdated(QOpcUa::NodeAttribute attr, const QVariant &value);
+    void machineDesignationRead(QOpcUa::NodeAttributes attr);
+    void setpointWritten(QOpcUa::NodeAttribute attr, QOpcUa::UaStatusCode status);
+    void handleMethodResult(QString methodNodeId, const QVariant &result, QOpcUa::UaStatusCode statusCode);
+    void enableMonitoringFinished(QOpcUa::NodeAttribute attr, QOpcUa::UaStatusCode status);
+
+signals:
+    void percentFilledTank1Changed(double value);
+    void percentFilledTank2Changed(double value);
+    void tank2TargetPercentChanged(double value);
+    void tank2ValveStateChanged(bool state);
+    void machineStateChanged(OpcUaMachineBackend::MachineState state);
+    void connectedChanged(bool connected);
+    void machineDesignationChanged(QString designation);
+    void messageChanged(QString message);
+    void backendsChanged(QStringList backends);
+
+private:
+    void setBackends(const QStringList &backends);
+
+    QScopedPointer<QOpcUaClient> m_client;
+    QScopedPointer<QOpcUaNode> m_machineStateNode;
+    QScopedPointer<QOpcUaNode> m_percentFilledTank1Node;
+    QScopedPointer<QOpcUaNode> m_percentFilledTank2Node;
+    QScopedPointer<QOpcUaNode> m_tank2TargetPercentNode;
+    QScopedPointer<QOpcUaNode> m_tank2ValveStateNode;
+    QScopedPointer<QOpcUaNode> m_machineNode;
+    QScopedPointer<QOpcUaNode> m_machineDesignationNode;
+    double m_percentFilledTank1;
+    double m_percentFilledTank2;
+    double m_tank2TargetPercent;
+    bool m_tank2ValveState;
+    MachineState m_machineState;
+    QString m_machineDesignation;
+
+    bool m_connected;
+    QString m_message;
+
+    bool m_successfullyCreated;
+    QStringList m_backends;
+};
+
+Q_DECLARE_METATYPE(OpcUaMachineBackend::MachineState)
+
+#endif // OPCUAMACHINEBACKEND_H