Add secure CoAP client example

This example demonstrates sending secure CoAP GET requests
in PreSharedKey and Certificate modes.

Change-Id: I90ea8c77232bfca1ca86bdd7a73223b6ba8b0c9b
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

8 files changed, 675 insertions, 0 deletions

diff --git a/examples/coap/coap.pro b/examples/coap/coap.pro
index dcac089..ba1d57a 100644
--- a/examples/coap/coap.pro
+++ b/examples/coap/coap.pro
@@ -1,6 +1,7 @@
 TEMPLATE = subdirs
 
 SUBDIRS += \
+    quicksecureclient \
     quickmulticastclient \
     simplecoapclient \
     consolecoapclient
diff --git a/examples/coap/quicksecureclient/FilePicker.qml b/examples/coap/quicksecureclient/FilePicker.qml
new file mode 100644
index 0000000..a7cd641
--- /dev/null
+++ b/examples/coap/quicksecureclient/FilePicker.qml
@@ -0,0 +1,88 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the QtCoap module.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.13
+import QtQuick.Controls 2.13
+import QtQuick.Layouts 1.13
+import Qt.labs.platform 1.0
+
+Item {
+    id: filePicker
+
+    property string dialogText
+    property alias selectedFile: filePathField.text
+
+    height: addFileButton.height
+
+    FileDialog {
+        id: fileDialog
+        title: qsTr("Please Choose %1").arg(dialogText)
+        folder: StandardPaths.writableLocation(StandardPaths.HomeLocation)
+        fileMode: FileDialog.OpenFile
+        onAccepted: filePathField.text = fileDialog.file
+    }
+
+    RowLayout {
+        anchors.fill: parent
+        TextField {
+            id: filePathField
+            placeholderText: qsTr("<%1>").arg(dialogText)
+            inputMethodHints: Qt.ImhUrlCharactersOnly
+            selectByMouse: true
+            Layout.fillWidth: true
+        }
+
+        Button {
+            id: addFileButton
+            text: qsTr("Add %1").arg(dialogText)
+            onClicked: fileDialog.open()
+        }
+    }
+}
diff --git a/examples/coap/quicksecureclient/main.cpp b/examples/coap/quicksecureclient/main.cpp
new file mode 100644
index 0000000..2bfeff5
--- /dev/null
+++ b/examples/coap/quicksecureclient/main.cpp
@@ -0,0 +1,97 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the QtCoap module.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmlcoapsecureclient.h"
+
+#include <QGuiApplication>
+#include <QNetworkInterface>
+#include <QQmlApplicationEngine>
+#include <QQmlContext>
+
+static QStringList availableHosts()
+{
+    QStringList hosts;
+
+    const auto networkInterfaces = QNetworkInterface::allInterfaces();
+    for (const auto &interface : networkInterfaces)
+        for (const auto &address : interface.addressEntries())
+            hosts.push_back(address.ip().toString());
+
+    return hosts;
+}
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QCoreApplication::setOrganizationName("Qt CoAP Example");
+
+    QGuiApplication app(argc, argv);
+    QQmlApplicationEngine engine;
+
+    qmlRegisterType<QmlCoapSecureClient>("CoapSecureClient", 1, 0, "CoapSecureClient");
+
+    // Register the QtCoap namespace
+    qmlRegisterUncreatableMetaObject(QtCoap::staticMetaObject, "qtcoap.example.namespace", 1, 0,
+                                     "QtCoap", "Access to enums is read-only");
+
+    const QUrl url(QStringLiteral("qrc:/main.qml"));
+    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
+                     &app, [url](QObject *obj, const QUrl &objUrl) {
+        // Exit with error, if the object for main.qml could not be loaded.
+        if (!obj && url == objUrl)
+            QCoreApplication::exit(-1);
+    }, Qt::QueuedConnection);
+
+    engine.rootContext()->setContextProperty("hostsModel", availableHosts());
+
+    engine.load(url);
+
+    return app.exec();
+}
diff --git a/examples/coap/quicksecureclient/main.qml b/examples/coap/quicksecureclient/main.qml
new file mode 100644
index 0000000..8b637db
--- /dev/null
+++ b/examples/coap/quicksecureclient/main.qml
@@ -0,0 +1,220 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the QtCoap module.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.13
+import QtQuick.Layouts 1.13
+import QtQuick.Controls 2.13
+import QtQuick.Window 2.13
+import CoapSecureClient 1.0
+import qtcoap.example.namespace 1.0
+
+Window {
+    visible: true
+    width: 480
+    height: 640
+    title: qsTr("Qt Quick Secure CoAP Client")
+
+    CoapSecureClient {
+        id: client
+        onFinished: {
+            outputView.text = result
+            statusLabel.text = ""
+        }
+    }
+
+    GridLayout {
+        anchors.fill: parent
+        anchors.margins: 10
+        columns: 2
+
+        Label {
+            text: qsTr("Host:")
+        }
+        ComboBox {
+            id: hostComboBox
+            editable: true
+            model: hostsModel
+            Layout.fillWidth: true
+        }
+
+        Label {
+            text: qsTr("Port:")
+        }
+        TextField {
+            id: portField
+            text: "5684"
+            placeholderText: qsTr("<Port>")
+            inputMethodHints: Qt.ImhDigitsOnly
+            Layout.preferredWidth: 80
+        }
+
+        Label {
+            text: qsTr("Resource:")
+        }
+        TextField {
+            id: resourceField
+            placeholderText: qsTr("<Resource Path>")
+            inputMethodHints: Qt.ImhUrlCharactersOnly
+            selectByMouse: true
+            Layout.fillWidth: true
+        }
+
+        Label {
+            text: qsTr("Security Mode:")
+        }
+        ButtonGroup {
+            id: securityModeGroup
+            onClicked: {
+                if (securityModeGroup.checkedButton === preSharedMode)
+                    client.setSecurityMode(QtCoap.PreSharedKey);
+                else
+                    client.setSecurityMode(QtCoap.Certificate);
+            }
+        }
+        RowLayout {
+            RadioButton {
+                id: preSharedMode
+                text: qsTr("Pre-shared Key")
+                ButtonGroup.group: securityModeGroup
+            }
+            RadioButton {
+                id: certificateMode
+                text: qsTr("X.509 Certificate")
+                ButtonGroup.group: securityModeGroup
+            }
+        }
+
+        RowLayout {
+            enabled: securityModeGroup.checkedButton === preSharedMode
+            Layout.columnSpan: 2
+
+            Label {
+                text: qsTr("Key")
+            }
+            TextField {
+                id: pskField
+                placeholderText: qsTr("<Pre-shared Key>")
+                Layout.fillWidth: true
+            }
+
+            Label {
+                text: qsTr("Identity")
+            }
+            TextField {
+                id: identityField
+                placeholderText: qsTr("<Identity>")
+                Layout.fillWidth: true
+            }
+        }
+
+        FilePicker {
+            id: localCertificatePicker
+            dialogText: "Local Certificate"
+            enabled: securityModeGroup.checkedButton === certificateMode
+            Layout.columnSpan: 2
+            Layout.fillWidth: true
+        }
+
+        FilePicker {
+            id: caCertificatePicker
+            dialogText: "CA Certificate"
+            enabled: securityModeGroup.checkedButton === certificateMode
+            Layout.columnSpan: 2
+            Layout.fillWidth: true
+        }
+
+        FilePicker {
+            id: privateKeyPicker
+            dialogText: "Private Key"
+            enabled: securityModeGroup.checkedButton === certificateMode
+            Layout.columnSpan: 2
+            Layout.fillWidth: true
+        }
+
+        Button {
+            id: requestButton
+            text: qsTr("Send Request")
+            enabled: securityModeGroup.checkState !== Qt.Unchecked
+            Layout.columnSpan: 2
+
+            onClicked: {
+                outputView.text = "";
+                if (securityModeGroup.checkedButton === preSharedMode)
+                    client.setSecurityConfiguration(pskField.text, identityField.text);
+                else
+                    client.setSecurityConfiguration(localCertificatePicker.selectedFile,
+                                                    caCertificatePicker.selectedFile,
+                                                    privateKeyPicker.selectedFile);
+
+                client.sendGetRequest(hostComboBox.editText, resourceField.text,
+                                      parseInt(portField.text));
+
+                statusLabel.text = qsTr("Sending request to %1%2...").arg(hostComboBox.editText)
+                                                                     .arg(resourceField.text);
+            }
+        }
+
+        TextArea {
+            id: outputView
+            placeholderText: qsTr("<Client Output>")
+            background: Rectangle {
+                border.color: "gray"
+            }
+            Layout.columnSpan: 2
+            Layout.fillHeight: true
+            Layout.fillWidth: true
+        }
+        Label {
+            id: statusLabel
+            Layout.columnSpan: 2
+            Layout.fillWidth: true
+        }
+    }
+}
diff --git a/examples/coap/quicksecureclient/qml.qrc b/examples/coap/quicksecureclient/qml.qrc
new file mode 100644
index 0000000..7f8ea45
--- /dev/null
+++ b/examples/coap/quicksecureclient/qml.qrc
@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+        <file>FilePicker.qml</file>
+    </qresource>
+</RCC>
diff --git a/examples/coap/quicksecureclient/qmlcoapsecureclient.cpp b/examples/coap/quicksecureclient/qmlcoapsecureclient.cpp
new file mode 100644
index 0000000..f73af8e
--- /dev/null
+++ b/examples/coap/quicksecureclient/qmlcoapsecureclient.cpp
@@ -0,0 +1,161 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the QtCoap module.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmlcoapsecureclient.h"
+
+#include <QCoapReply>
+#include <QFile>
+#include <QLoggingCategory>
+#include <QMetaEnum>
+#include <QUrl>
+
+Q_LOGGING_CATEGORY(lcCoapClient, "qt.coap.client")
+
+QmlCoapSecureClient::QmlCoapSecureClient(QObject *parent)
+    : QObject(parent)
+    , m_coapClient(nullptr)
+    , m_securityMode(QtCoap::NoSec)
+{
+}
+
+QmlCoapSecureClient::~QmlCoapSecureClient()
+{
+    if (m_coapClient) {
+        delete m_coapClient;
+        m_coapClient = nullptr;
+    }
+}
+
+static QString errorMessage(QtCoap::Error errorCode)
+{
+    const auto error = QMetaEnum::fromType<QtCoap::Error>().valueToKey(errorCode);
+    return QString("Request failed with error: %1\n").arg(error);
+}
+
+void QmlCoapSecureClient::setSecurityMode(QtCoap::SecurityMode mode)
+{
+    // Create a new client, if the security mode has changed
+    if (m_coapClient && mode != m_securityMode) {
+        delete m_coapClient;
+        m_coapClient = nullptr;
+    }
+
+    if (!m_coapClient) {
+        m_coapClient = new QCoapClient(mode);
+        m_securityMode = mode;
+
+        connect(m_coapClient, &QCoapClient::finished, this,
+                [this](QCoapReply *reply) {
+                    if (!reply)
+                        emit finished("Something went wrong, received a null reply");
+                    else if (reply->errorReceived() != QtCoap::NoError)
+                        emit finished(errorMessage(reply->errorReceived()));
+                    else
+                        emit finished(reply->message().payload());
+                });
+
+        connect(m_coapClient, &QCoapClient::error, this,
+                [this](QCoapReply *, QtCoap::Error errorCode) {
+                    emit finished(errorMessage(errorCode));
+                });
+    }
+}
+
+void QmlCoapSecureClient::sendGetRequest(const QString &host, const QString &path, int port)
+{
+    if (!m_coapClient)
+        return;
+
+    m_coapClient->setSecurityConfiguration(m_configuration);
+
+    QUrl url;
+    url.setHost(host);
+    url.setPath(path);
+    url.setPort(port);
+    m_coapClient->get(url);
+}
+
+void
+QmlCoapSecureClient::setSecurityConfiguration(const QString &preSharedKey, const QString &identity)
+{
+    QCoapSecurityConfiguration configuration;
+    configuration.setPreSharedKey(preSharedKey.toUtf8());
+    configuration.setIdentity(identity.toUtf8());
+    m_configuration = configuration;
+}
+
+void QmlCoapSecureClient::setSecurityConfiguration(const QString &localCertificatePath,
+                                                   const QString &caCertificatePath,
+                                                   const QString &privateKeyPath)
+{
+    QCoapSecurityConfiguration configuration;
+
+    const auto localCerts = QSslCertificate::fromPath(QUrl(localCertificatePath).toLocalFile());
+    if (localCerts.isEmpty())
+        qCWarning(lcCoapClient, "The specified local certificate file is not valid.");
+    else
+        configuration.setLocalCertificateChain(localCerts.toVector());
+
+    const auto caCerts = QSslCertificate::fromPath(QUrl(caCertificatePath).toLocalFile());
+    if (caCerts.isEmpty())
+        qCWarning(lcCoapClient, "The specified CA certificate file is not valid.");
+    else
+        configuration.setCaCertificates(caCerts.toVector());
+
+    QFile privateKey(QUrl(privateKeyPath).toLocalFile());
+    if (privateKey.open(QIODevice::ReadOnly)) {
+        QCoapPrivateKey key(privateKey.readAll(), QSsl::Ec);
+        configuration.setPrivateKey(key);
+    } else {
+        qCWarning(lcCoapClient) << "Unable to read the specified private key file"
+                                << privateKeyPath;
+    }
+    m_configuration = configuration;
+}
diff --git a/examples/coap/quicksecureclient/qmlcoapsecureclient.h b/examples/coap/quicksecureclient/qmlcoapsecureclient.h
new file mode 100644
index 0000000..1451d32
--- /dev/null
+++ b/examples/coap/quicksecureclient/qmlcoapsecureclient.h
@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the QtCoap module.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMLCOAPSECURECLIENT_H
+#define QMLCOAPSECURECLIENT_H
+
+#include <QCoapClient>
+#include <QCoapSecurityConfiguration>
+
+class QmlCoapSecureClient : public QObject
+{
+    Q_OBJECT
+
+public:
+    QmlCoapSecureClient(QObject *parent = nullptr);
+    ~QmlCoapSecureClient() override;
+
+    Q_INVOKABLE void setSecurityMode(QtCoap::SecurityMode mode);
+    Q_INVOKABLE void sendGetRequest(const QString &host, const QString &path, int port);
+    Q_INVOKABLE void setSecurityConfiguration(const QString &preSharedKey, const QString &identity);
+    Q_INVOKABLE void setSecurityConfiguration(const QString &localCertificatePath,
+                                              const QString &caCertificatePath,
+                                              const QString &privateKeyPath);
+
+Q_SIGNALS:
+    void finished(const QString &result);
+
+private:
+    QCoapClient *m_coapClient;
+    QCoapSecurityConfiguration m_configuration;
+    QtCoap::SecurityMode m_securityMode;
+};
+
+#endif // QMLCOAPSECURECLIENT_H
diff --git a/examples/coap/quicksecureclient/quicksecureclient.pro b/examples/coap/quicksecureclient/quicksecureclient.pro
new file mode 100644
index 0000000..52fcea9
--- /dev/null
+++ b/examples/coap/quicksecureclient/quicksecureclient.pro
@@ -0,0 +1,21 @@
+TEMPLATE = app
+
+QT += qml quick coap
+CONFIG += c++11
+
+DEFINES += QT_DEPRECATED_WARNINGS
+
+HEADERS += \
+    qmlcoapsecureclient.h
+
+SOURCES += \
+    main.cpp \
+    qmlcoapsecureclient.cpp
+
+DISTFILES += \
+    FilePicker.qml
+
+RESOURCES += qml.qrc
+
+target.path = $$[QT_INSTALL_EXAMPLES]/coap/quicksecureclient
+INSTALLS += target