Quick CoAP Multicast Discovery Example

 /****************************************************************************
 **
 ** 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 2.12
 import QtQuick.Window 2.12
 import QtQuick.Controls 2.12
 import QtQuick.Layouts 1.13
 import CoapMulticastClient 1.0
 import qtcoap.example.namespace 1.0

 Window {
     visible: true
     width: 480
     height: 480
     title: qsTr("Qt Quick CoAP Multicast Discovery")

     function addResource(resource) {
         resourceModel.insert(0, {"host" : resource.host,
                                  "path" : resource.path,
                                  "title" : resource.title})
     }

     CoapMulticastClient {
         id: client
         onDiscovered: addResource(resource)

         onFinished: {
             statusLabel.text = (error === QtCoap.Error.Ok)
                     ? qsTr("Finished resource discovery.")
                     : qsTr("Resource discovery failed with error code: %1").arg(error)
         }

         onError:
             statusLabel.text = qsTr("Resource discovery failed with error code: %1").arg(error)
     }

     GridLayout {
         anchors.fill: parent
         anchors.margins: 10
         columns: 2

         Label {
             text: qsTr("Host:")
         }

         RowLayout {
             spacing: 5

             ComboBox {
                 id: groupComboBox
                 textRole: "group"
                 Layout.preferredWidth: 210
                 model: ListModel {
                     id: cbItems
                     ListElement {
                         group: qsTr("IPv4 CoAP Nodes")
                         address: "224.0.1.187"
                         value: QtCoap.MulticastGroup.AllCoapNodesIPv4
                     }
                     ListElement {
                         group: qsTr("IPv6 Link Local CoAP Nodes")
                         address: "ff02::fd"
                         value: QtCoap.MulticastGroup.AllCoapNodesIPv6LinkLocal
                     }
                     ListElement {
                         group: qsTr("IPv6 Site Local CoAP Nodes")
                         address: "ff05::fd"
                         value: QtCoap.MulticastGroup.AllCoapNodesIPv6SiteLocal
                     }
                     ListElement {
                         group: qsTr("Other")
                         address: ""
                         value: -1
                     }
                 }

                 delegate: ItemDelegate {
                     width: groupComboBox.width
                     contentItem: Column {
                         Text { text: group }
                         Text { text: address }
                     }
                     highlighted: groupComboBox.highlightedIndex === index
                 }
             }

             TextField {
                 id: customGroupField
                 placeholderText: qsTr("<Custom Group>")
                 enabled: groupComboBox.model.get(groupComboBox.currentIndex).value === -1
                 Layout.fillWidth: true
             }
         }

         Label {
             text: qsTr("Port:")
         }

         TextField {
             id: portField
             text: "5683"
             placeholderText: qsTr("<Port>")
             inputMethodHints: Qt.ImhDigitsOnly
             Layout.preferredWidth: 80
         }

         Label {
             text: qsTr("Discovery Path:")
         }

         TextField {
             id: discoveryPathField
             text: "/.well-known/core"
             placeholderText: qsTr("<Resource Discovery Path>")
             inputMethodHints: Qt.ImhUrlCharactersOnly
             Layout.fillWidth: true
         }

         Button {
             id: discoverButton
             text: qsTr("Discover")
             Layout.columnSpan: 2

             onClicked: {
                 var currentGroup = groupComboBox.model.get(groupComboBox.currentIndex).value;

                 var path = "";
                 if (currentGroup !== - 1) {
                     client.discover(currentGroup, parseInt(portField.text),
                                     discoveryPathField.text);
                     path = groupComboBox.currentText;
                 } else {
                     client.discover(customGroupField.text, parseInt(portField.text),
                                     discoveryPathField.text);
                     path = customGroupField.text + discoveryPathField.text;
                 }
                 statusLabel.text = qsTr("Discovering resources at %1...").arg(path);
             }
         }

         ListModel {
             id: resourceModel
         }

         ListView {
             id: resourceView
             model: resourceModel
             clip: true
             Layout.columnSpan: 2
             Layout.fillHeight: true
             Layout.fillWidth: true

             delegate: Rectangle {
                 width: resourceView.width
                 height: 60
                 color: "lightgray"
                 border.color: "darkgray"
                 radius: 5

                 Column {
                     topPadding: 5
                     leftPadding: 5
                     Text { text: qsTr('<b>Host:</b> %1').arg(host) }
                     Text { text: qsTr('<b>Resource:</b> %1').arg(path) }
                     Text { text: qsTr('<b>Title:</b> %1').arg(title) }
                 }
             }
         }
         Label {
             id: statusLabel
             Layout.columnSpan: 2
             Layout.fillWidth: true
         }
     }
 }