1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/****************************************************************************
**
** 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()), quint16(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);
}
/*!
Installs an \a observer that can be used to obtain notifications when a
new TCP client connects to this server instance. In addition, the \a observer
can be used to reject the incoming TCP connection.
QModbusTcpServer takes ownership of the given \a observer. Any previously set
observer will be deleted. The observer can be uninstalled by calling this
function with \c nullptr as parameter.
\sa QModbusTcpConnectionObserver
\since 5.13
*/
void QModbusTcpServer::installConnectionObserver(QModbusTcpConnectionObserver *observer)
{
Q_D(QModbusTcpServer);
d->m_observer.reset(observer);
}
/*!
\class QModbusTcpConnectionObserver
\inmodule QtSerialBus
\since 5.13
\brief The QModbusTcpConnectionObserver class represents the interface for
objects that can be passed to \l QModbusTcpServer::installConnectionObserver.
The interface must be implemented by the developer to be able to monitor
every incoming TCP connection from another Modbus client.
\sa QModbusTcpServer::installConnectionObserver
*/
QModbusTcpConnectionObserver::~QModbusTcpConnectionObserver()
{
}
/*!
\fn bool QModbusTcpConnectionObserver::acceptNewConnection(QTcpSocket *newClient)
This function is a callback for every incoming TCP connection. The user should
provide \a newClient to receive a notification when a new client connection
is established and to determine whether the connection is to be accepted.
The function should return \c true if the connection is to be accepted. Otherwise,
the socket is closed/rejected.
*/
/*!
\fn void QModbusTcpServer::modbusClientDisconnected(QTcpSocket *modbusClient)
This signal is emitted when a current TCP based \a modbusClient disconnects
from this Modbus TCP server. Note that there might be several TCP clients
connected at the same time.
Notifications on incoming new connections can be received by installing a
QModbusTcpConnectionObserver via \l installConnectionObserver().
\sa installConnectionObserver
\since 5.13
*/
QT_END_NAMESPACE
|
