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diff --git a/src/knx/netip/qknxnetiproutinginterface_p.h b/src/knx/netip/qknxnetiproutinginterface_p.h
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+/******************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtKnx module.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+******************************************************************************/
+
+#ifndef QKNXNETIPROUTINGINTERFACE_P_H
+#define QKNXNETIPROUTINGINTERFACE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt KNX API.  It exists for the convenience
+// of the Qt KNX implementation.  This header file may change from version
+// to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/private/qobject_p.h>
+#include <QtCore/qtimer.h>
+
+#include <QtKnx/qknxnetip.h>
+#include <QtKnx/qknxnetipframe.h>
+#include <QtKnx/qknxnetiproutinginterface.h>
+
+#include <QtNetwork/qnetworkdatagram.h>
+#include <QtNetwork/qnetworkinterface.h>
+#include <QtNetwork/qudpsocket.h>
+
+QT_BEGIN_NAMESPACE
+
+class QKnxNetIpRoutingInterfacePrivate : public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QKnxNetIpRoutingInterface)
+public:
+    QKnxNetIpRoutingInterfacePrivate() = default;
+    ~QKnxNetIpRoutingInterfacePrivate() = default;
+
+    void start();
+    void restart();
+    void stop();
+
+    void cleanup();
+
+    void processRoutingIndication(const QKnxNetIpFrame &frame);
+    void processRoutingBusy(const QKnxNetIpFrame &frame);
+    void processRoutingLostMessage(const QKnxNetIpFrame &frame);
+
+    bool sendFrame(const QKnxNetIpFrame &frame);
+
+    void flowControlHandling(quint16 newBusyWaitTime);
+
+    void changeState(QKnxNetIpRoutingInterface::State state);
+    void errorOccurred(QKnxNetIpRoutingInterface::Error error, const QString &errorString);
+
+    QKnxNetIpRoutingInterface::FilterAction filterAction(const QKnxLinkLayerFrame &frame);
+
+    QUdpSocket *m_socket { nullptr };
+
+    QKnxAddress m_individualAddress;
+
+    quint16 m_framesReadCount;
+    QKnxAddress m_lastIndicationAddress;
+    quint16 m_sameKnxDstAddressIndicationCount;
+
+    QNetworkInterface m_iface;
+    QHostAddress m_multicastAddress { QLatin1String(QKnxNetIp::Constants::MulticastAddress) };
+    quint16 m_multicastPort { QKnxNetIp::Constants::DefaultPort };
+    QHostAddress m_ownAddress;
+
+    QKnxNetIpRoutingInterface::State m_state { QKnxNetIpRoutingInterface::State::NotInit };
+
+    quint16 m_busyWaitTime { QKnxNetIp::RoutingBusyWaitTime };
+    QTimer *m_busyTimer { nullptr };
+
+    enum class BusyTimerStage : quint8
+    {
+        NotInit,
+        Wait,
+        RandomWait,
+        SlowDuration,
+        DecrementBusyCounter
+    };
+    BusyTimerStage m_busyStage { BusyTimerStage::NotInit };
+    quint32 m_busyCounter { 0 };
+
+    QKnxNetIpRoutingInterface::Error m_error { QKnxNetIpRoutingInterface::Error::None };
+    QString m_errorMessage;
+
+    QKnxNetIpRoutingInterface::FilterTable m_filterTable;
+    QKnxNetIpRoutingInterface::RoutingMode m_routingMode { QKnxNetIpRoutingInterface::RoutingMode::BlockRouting };
+};
+
+QT_END_NAMESPACE
+
+#endif