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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.
**
** $QT_END_LICENSE$
**
******************************************************************************/
#include "qknxnetipconnectionstateresponse.h"
QT_BEGIN_NAMESPACE
/*!
\class QKnxNetIpConnectionStateResponseProxy
\inmodule QtKnx
\ingroup qtknx-netip
\brief The QKnxNetIpConnectionStateResponseProxy class provides the means to
read a KNXnet/IP connection state response from the generic
\l QKnxNetIpFrame class and to create a connection state response frame
based on the information.
A KNXnet/IP client reqularly sends a connection state request frame,
\l QKnxNetIpConnectionStateRequestProxy, to the KNXnet/IP server's control
endpoint to check the state of a connection established to the server.
The server responds immediately with a connection state response frame.
In most programs, this class will not be used directly. Instead, the
\l QKnxNetIpTunnel or \l QKnxNetIpDeviceManagement
class is used to establish a functional connection to a KNXnet/IP server.
\note When using QKnxNetIpConnectionStateResponseProxy, care must be taken
to ensure that the referenced KNXnet/IP frame outlives the proxy on all code
paths, lest the proxy ends up referencing deleted data.
The following code sample illustrates how to read the connection state
response information sent by a KNXnet/IP server:
\code
auto netIpFrame = QKnxNetIpFrame::fromBytes(...);
const QKnxNetIpConnectionStateResponseProxy proxy(netIpFrame);
if (!proxy.isValid())
return;
auto chanId = proxy.channelId();
auto status = proxy.status();
\endcode
\sa builder(), QKnxNetIpConnectionStateRequestProxy, {Qt KNXnet/IP Connection Classes}
*/
/*!
\fn QKnxNetIpConnectionStateResponseProxy::QKnxNetIpConnectionStateResponseProxy()
\internal
*/
/*!
\fn QKnxNetIpConnectionStateResponseProxy::~QKnxNetIpConnectionStateResponseProxy()
\internal
*/
/*!
\fn QKnxNetIpConnectionStateResponseProxy::QKnxNetIpConnectionStateResponseProxy(const QKnxNetIpFrame &&)
\internal
*/
/*!
Constructs a proxy object to read the connection state response
information carried by the specified KNXnet/IP frame \a frame.
*/
QKnxNetIpConnectionStateResponseProxy::QKnxNetIpConnectionStateResponseProxy(const QKnxNetIpFrame &frame)
: m_frame(frame)
{}
/*!
Returns the ID of the communication channel prepared by the KNXnet/IP
server.
*/
quint8 QKnxNetIpConnectionStateResponseProxy::channelId() const
{
return m_frame.constData().value(0);
}
/*!
Returns the state of the connection channel established to a KNXnet/IP
server.
*/
QKnxNetIp::Error QKnxNetIpConnectionStateResponseProxy::status() const
{
return QKnxNetIp::Error(m_frame.constData().value(1));
}
/*!
Returns \c true if the frame contains initialized values and is in itself
valid, otherwise returns \c false. A valid KNXnet/IP frame consists of
at least a valid header and a size in bytes corresponding to the total size
of the KNXnet/IP frame header.
\sa QKnxNetIpFrameHeader::totalSize()
*/
bool QKnxNetIpConnectionStateResponseProxy::isValid() const
{
return m_frame.isValid() && m_frame.size() == 8
&& m_frame.serviceType() == QKnxNetIp::ServiceType::ConnectionStateResponse;
}
/*!
Returns a builder object to create a KNXnet/IP connection state response
frame.
*/
QKnxNetIpConnectionStateResponseProxy::Builder QKnxNetIpConnectionStateResponseProxy::builder()
{
return QKnxNetIpConnectionStateResponseProxy::Builder();
}
/*!
\class QKnxNetIpConnectionStateResponseProxy::Builder
\inmodule QtKnx
\inheaderfile QKnxNetIpConnectionStateResponseProxy
\brief The QKnxNetIpConnectionStateResponseProxy::Builder class provides the
means to create a KNXnet/IP connection state response frame.
A KNXnet/IP connection state response contains the status of a communication
channel between a KNXnet/IP client and a KNXnet/IP server.
In most programs, this class will not be used directly. Instead, the
\l QKnxNetIpTunnel or \l QKnxNetIpDeviceManagement
class is used to establish a functional connection to a KNXnet/IP server.
The common way to create a connection state response is:
\code
auto netIpFrame = QKnxNetIpConnectionStateResponseProxy::builder()
.setChannelId(25)
.setStatus(QKnx::NetIp::Error::None)
.create();
\endcode
If the KNXnet/IP client does not receive the connection state response
within a timeout, or the status of the received response indicates that
errors occurred, the client repeats the connection state request three
times. It then terminates the connection by sending a disconnect request,
\l QKnxNetIpDisconnectRequestProxy, to the server's control endpoint.
*/
/*!
Sets the ID of the communication channel to \a channelId and returns a
reference to the builder.
*/
QKnxNetIpConnectionStateResponseProxy::Builder &
QKnxNetIpConnectionStateResponseProxy::Builder::setChannelId(quint8 channelId)
{
m_channelId = channelId;
return *this;
}
/*!
Returns the state of the connection channel established to a KNXnet/IP
server to \a status and returns a reference to the builder.
*/
QKnxNetIpConnectionStateResponseProxy::Builder &
QKnxNetIpConnectionStateResponseProxy::Builder::setStatus(QKnxNetIp::Error status)
{
m_status = status;
return *this;
}
/*!
Creates and returns a KNXnet/IP connection state response frame.
\note The returned frame may be invalid depending on the values used during
setup.
\sa isValid()
*/
QKnxNetIpFrame QKnxNetIpConnectionStateResponseProxy::Builder::create() const
{
QKnxByteArray data;
switch (m_status) {
case QKnxNetIp::Error::None:
case QKnxNetIp::Error::ConnectionId:
case QKnxNetIp::Error::DataConnection:
case QKnxNetIp::Error::KnxConnection:
data = { m_channelId, quint8(m_status) };
break;
default:
break;
};
return { QKnxNetIp::ServiceType::ConnectionStateResponse, data };
}
QT_END_NAMESPACE
|
