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/****************************************************************************
**
** Copyright (C) 2015 basysKom GmbH, opensource@basyskom.com
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtOpcUa 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 "qopcuaclient.h"
#include <private/qopcuaclient_p.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/qregexp.h>
QT_BEGIN_NAMESPACE
Q_DECLARE_LOGGING_CATEGORY(QT_OPCUA)
/*!
\class QOpcUaClient
\inmodule QtOpcUa
\brief QOpcUaClient allows interaction with an OPC UA server.
\chapter QOpcUaClient
QOpcUaClient implements basic client capabilities to communicate with
OPC UA enabled devices and applications.
\section1 Addressing Nodes
For an introduction to nodes, see QOpcUaNode.
Addressing nodes on the OPC UA server using QOpcUaClient is done via a
text format.
A node is identified by its namespace ID and an identifier which can e. g.
be numeric or a string.
The identifier of a node residing in namespace 0 and having the numeric
identifier 42, the string is \c ns=0;i=42, a node with a string
identifier can be addressed via \c ns=0;s=myStringIdentifier.
*/
/*!
\enum QOpcUaClient::ClientState
This enum type specifies the connection state of the client.
\value Disconnected
The client is not connected to a server.
\value Connecting
The client is currently connecting to a server.
\value Connected
The client is connected to a server.
\value Closing
The client has been connected and requests a disconnect from the server.
*/
/*!
\enum QOpcUaClient::ClientError
This enum type specifies the current error state of the client.
\value NoError
No error occurred.
\value InvalidUrl
The url to connect to has been wrongly specified or a connection to this url failed.
\value SecureConnectionError
An attempt to connect to a server with a secure connection failed.
\value AccessDenied
An attempt to connect to a server using username/password failed due to wrong credentials.
\value UnknownError
An unknown error occurred.
*/
/*!
\property QOpcUaClient::error
\brief Specifies the current error state of the client.
*/
/*!
\property QOpcUaClient::state
\brief Specifies the current connection state of the client.
*/
/*!
\fn QOpcUaClient::connected()
This signal is emitted when a connection has been established.
*/
/*!
\fn QOpcUaClient::disconnected()
This signal is emitted when a connection has been closed following to a close request.
*/
/*!
\internal QOpcUaClientImpl is an opaque type (as seen from the public API).
This prevents users of the public API to use this constructor (eventhough
it is public).
*/
QOpcUaClient::QOpcUaClient(QOpcUaClientImpl *impl, QObject *parent)
: QObject(*(new QOpcUaClientPrivate(impl)), parent)
{
impl->m_client = this;
}
/*!
Destroys the \l QOpcUaClient instance.
*/
QOpcUaClient::~QOpcUaClient()
{
}
/*!
Connects to the OPC UA endpoint given in \a url.
\sa disconnectFromEndpoint()
*/
void QOpcUaClient::connectToEndpoint(const QUrl &url)
{
Q_D(QOpcUaClient);
d->connectToEndpoint(url);
}
/*!
Connects to an endpoint given by \a url using the highest security level
supported by client and server.
true is returned in case of success, false is returned when the connection
fails.
User name and password must be set on \a url before connectToEndpoint
is called.
\warning Currently not supported by the FreeOPCUA backend.
\sa disconnectFromEndpoint()
*/
void QOpcUaClient::secureConnectToEndpoint(const QUrl &url)
{
Q_D(QOpcUaClient);
d->secureConnectToEndpoint(url);
}
/*!
Disconnects from the server.
\sa connectToEndpoint()
*/
void QOpcUaClient::disconnectFromEndpoint()
{
Q_D(QOpcUaClient);
d->disconnectFromEndpoint();
}
/*!
Returns the URL of the OPC UA server the client is currently connected to
or was last connected to.
*/
QUrl QOpcUaClient::url() const
{
Q_D(const QOpcUaClient);
return d->m_url;
}
QOpcUaClient::ClientState QOpcUaClient::state() const
{
Q_D(const QOpcUaClient);
return d->m_state;
}
/*!
Returns the current error state of the client.
*/
QOpcUaClient::ClientError QOpcUaClient::error() const
{
Q_D(const QOpcUaClient);
return d->m_error;
}
/*! Return if the backend is supported a connection over a secured channel.
\sa secureConnectToEndpoint
*/
bool QOpcUaClient::isSecureConnectionSupported() const
{
Q_D(const QOpcUaClient);
return d->m_impl->isSecureConnectionSupported();
}
/*!
Returns an QOpcUaNode object containing the information about
the OPC UA node identified by \a nodeId. The caller becomes the owner
of the node object. For this method to work the client needs to be
connected to the server. A null pointer is returned on error.
*/
QOpcUaNode *QOpcUaClient::node(const QString &nodeId)
{
if (state() != QOpcUaClient::Connected)
return nullptr;
static const QRegExp validXmlNotation(QLatin1String("^ns=\\d+;[isgb]=.+$"));
if (validXmlNotation.indexIn(nodeId) != 0) {
qCWarning(QT_OPCUA) << "NodeId" << "'" << nodeId << "' is not a valid XML node identifier";
return nullptr;
}
return d_func()->m_impl->node(nodeId);
}
/*!
Returns the name of the backend used by this instance of QOpcUaClient,
e.g. "freeopcua".
*/
QString QOpcUaClient::backend() const
{
return d_func()->m_impl->backend();
}
QT_END_NAMESPACE
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