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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSerialBus module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qmodbustcpserver.h"
#include "qmodbustcpserver_p.h"
#include <QtCore/qurl.h>
QT_BEGIN_NAMESPACE
/*!
\class QModbusTcpServer
\inmodule QtSerialBus
\since 5.8
\brief The QModbusTcpServer class represents a Modbus server that uses a
TCP server for its communication with the Modbus client.
Communication via Modbus requires the interaction between a single Modbus
client instance and single Modbus server. This class provides the Modbus
server implementation via a TCP server.
Modbus TCP networks can have multiple servers. Servers are read/written by
a client device represented by \l QModbusTcpClient.
*/
/*!
Constructs a QModbusTcpServer with the specified \a parent. The
\l serverAddress preset is \c 255.
*/
QModbusTcpServer::QModbusTcpServer(QObject *parent)
: QModbusServer(*new QModbusTcpServerPrivate, parent)
{
Q_D(QModbusTcpServer);
d->setupTcpServer();
setServerAddress(0xff);
}
/*!
Destroys the QModbusTcpServer instance.
*/
QModbusTcpServer::~QModbusTcpServer()
{
close();
}
/*!
\internal
*/
QModbusTcpServer::QModbusTcpServer(QModbusTcpServerPrivate &dd, QObject *parent)
: QModbusServer(dd, parent)
{
Q_D(QModbusTcpServer);
d->setupTcpServer();
}
/*!
\reimp
*/
bool QModbusTcpServer::open()
{
if (state() == QModbusDevice::ConnectedState)
return true;
Q_D(QModbusTcpServer);
if (d->m_tcpServer->isListening())
return false;
const QUrl url = QUrl::fromUserInput(d->m_networkAddress + QStringLiteral(":")
+ QString::number(d->m_networkPort));
if (!url.isValid()) {
setError(tr("Invalid connection settings for TCP communication specified."),
QModbusDevice::ConnectionError);
qCWarning(QT_MODBUS) << "(TCP server) Invalid host:" << url.host() << "or port:"
<< url.port();
return false;
}
if (d->m_tcpServer->listen(QHostAddress(url.host()), url.port()))
setState(QModbusDevice::ConnectedState);
else
setError(d->m_tcpServer->errorString(), QModbusDevice::ConnectionError);
return state() == QModbusDevice::ConnectedState;
}
/*!
\reimp
*/
void QModbusTcpServer::close()
{
if (state() == QModbusDevice::UnconnectedState)
return;
Q_D(QModbusTcpServer);
if (d->m_tcpServer->isListening())
d->m_tcpServer->close();
for (auto socket : qAsConst(d->connections))
socket->disconnectFromHost();
setState(QModbusDevice::UnconnectedState);
}
/*!
\reimp
Processes the Modbus client request specified by \a request and returns a
Modbus response.
The following Modbus function codes are filtered out as they are serial
line only according to the Modbus Application Protocol Specification 1.1b:
\list
\li \l QModbusRequest::ReadExceptionStatus
\li \l QModbusRequest::Diagnostics
\li \l QModbusRequest::GetCommEventCounter
\li \l QModbusRequest::GetCommEventLog
\li \l QModbusRequest::ReportServerId
\endlist
A request to the TCP server will be answered with a Modbus exception
response with the exception code QModbusExceptionResponse::IllegalFunction.
*/
QModbusResponse QModbusTcpServer::processRequest(const QModbusPdu &request)
{
switch (request.functionCode()) {
case QModbusRequest::ReadExceptionStatus:
case QModbusRequest::Diagnostics:
case QModbusRequest::GetCommEventCounter:
case QModbusRequest::GetCommEventLog:
case QModbusRequest::ReportServerId:
return QModbusExceptionResponse(request.functionCode(),
QModbusExceptionResponse::IllegalFunction);
default:
break;
}
return QModbusServer::processRequest(request);
}
QT_END_NAMESPACE
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