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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qmodbusrtuserialserver.h"
#include "qmodbusrtuserialserver_p.h"
#include <QtCore/qloggingcategory.h>
QT_BEGIN_NAMESPACE
/*!
\class QModbusRtuSerialServer
\inmodule QtSerialBus
\since 6.2
\brief The QModbusRtuSerialServer class represents a Modbus server
that uses a serial port for its communication with the Modbus client.
Communication via Modbus requires the interaction between a single Modbus
client instance and multiple Modbus server. This class provides the Modbus
server implementation via a serial port.
Since multiple Modbus server instances can interact with a Modbus client
at the same time (using a serial bus), servers are identified by their
\l serverAddress().
*/
/*!
Constructs a QModbusRtuSerialServer with the specified \a parent. The
\l serverAddress preset is \c 1.
*/
QModbusRtuSerialServer::QModbusRtuSerialServer(QObject *parent)
: QModbusServer(*new QModbusRtuSerialServerPrivate, parent)
{
Q_D(QModbusRtuSerialServer);
d->setupSerialPort();
}
/*!
Destroys the QModbusRtuSerialServer instance.
*/
QModbusRtuSerialServer::~QModbusRtuSerialServer()
{
close();
}
/*!
\internal
*/
QModbusRtuSerialServer::QModbusRtuSerialServer(QModbusRtuSerialServerPrivate &dd, QObject *parent)
: QModbusServer(dd, parent)
{
Q_D(QModbusRtuSerialServer);
d->setupSerialPort();
}
/*!
\reimp
*/
bool QModbusRtuSerialServer::processesBroadcast() const
{
return d_func()->m_processesBroadcast;
}
/*!
\since 6.2
Returns the amount of microseconds for the silent interval between two
consecutive Modbus messages.
\sa setInterFrameDelay()
*/
int QModbusRtuSerialServer::interFrameDelay() const
{
Q_D(const QModbusRtuSerialServer);
return d->m_interFrameDelayMilliseconds * 1000;
}
/*!
\since 6.2
Sets the amount of \a microseconds for the silent interval between two
consecutive Modbus messages. By default, the class implementation will use
a pre-calculated value according to the Modbus specification. A active or
running connection is not affected by such delay changes.
\note If \a microseconds is set to -1 or \a microseconds is less than the
pre-calculated delay then this pre-calculated value is used as frame delay.
*/
void QModbusRtuSerialServer::setInterFrameDelay(int microseconds)
{
Q_D(QModbusRtuSerialServer);
d->m_interFrameDelayMilliseconds = qCeil(qreal(microseconds) / 1000.);
d->calculateInterFrameDelay();
}
/*!
\reimp
\note When calling this function, existing buffered data is removed from
the serial port.
*/
bool QModbusRtuSerialServer::open()
{
if (state() == QModbusDevice::ConnectedState)
return true;
Q_D(QModbusRtuSerialServer);
d->setupEnvironment(); // to be done before open
if (d->m_serialPort->open(QIODevice::ReadWrite)) {
setState(QModbusDevice::ConnectedState);
d->m_serialPort->clear(); // only possible after open
} else {
setError(d->m_serialPort->errorString(), QModbusDevice::ConnectionError);
}
return (state() == QModbusDevice::ConnectedState);
}
/*!
\reimp
*/
void QModbusRtuSerialServer::close()
{
if (state() == QModbusDevice::UnconnectedState)
return;
Q_D(QModbusRtuSerialServer);
if (d->m_serialPort->isOpen())
d->m_serialPort->close();
setState(QModbusDevice::UnconnectedState);
}
/*!
\reimp
Processes the Modbus client request specified by \a request and returns a
Modbus response.
The Modbus function \l QModbusRequest::EncapsulatedInterfaceTransport with
MEI Type 13 (0x0D) CANopen General Reference is filtered out because it is
usually Modbus TCP or Modbus serial ASCII only.
A request to the RTU serial server will be answered with a Modbus exception
response with the exception code QModbusExceptionResponse::IllegalFunction.
*/
QModbusResponse QModbusRtuSerialServer::processRequest(const QModbusPdu &request)
{
if (request.functionCode() == QModbusRequest::EncapsulatedInterfaceTransport) {
quint8 meiType;
request.decodeData(&meiType);
if (meiType == EncapsulatedInterfaceTransport::CanOpenGeneralReference) {
return QModbusExceptionResponse(request.functionCode(),
QModbusExceptionResponse::IllegalFunction);
}
}
return QModbusServer::processRequest(request);
}
QT_END_NAMESPACE
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