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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import QtQuick 2.8
import QtQuick.Window 2.2
import QtQuick.Controls 2.1
import QtQuick.Layouts 1.1
import MqttClient 1.0
Window {
visible: true
width: 640
height: 480
title: qsTr("Qt Quick MQTT Subscription Example")
id: root
property var tempSubscription: 0
MqttClient {
id: client
hostname: hostnameField.text
port: portField.text
}
ListModel {
id: messageModel
}
function addMessage(payload)
{
messageModel.insert(0, {"payload" : payload})
if (messageModel.count >= 100)
messageModel.remove(99)
}
GridLayout {
anchors.fill: parent
anchors.margins: 10
columns: 2
Label {
text: "Hostname:"
enabled: client.state === MqttClient.Disconnected
}
TextField {
id: hostnameField
Layout.fillWidth: true
text: "test.mosquitto.org"
placeholderText: "<Enter host running MQTT broker>"
enabled: client.state === MqttClient.Disconnected
}
Label {
text: "Port:"
enabled: client.state === MqttClient.Disconnected
}
TextField {
id: portField
Layout.fillWidth: true
text: "1883"
placeholderText: "<Port>"
inputMethodHints: Qt.ImhDigitsOnly
enabled: client.state === MqttClient.Disconnected
}
Button {
id: connectButton
Layout.columnSpan: 2
Layout.fillWidth: true
text: client.state === MqttClient.Connected ? "Disconnect" : "Connect"
onClicked: {
if (client.state === MqttClient.Connected) {
client.disconnectFromHost()
messageModel.clear()
tempSubscription.destroy()
tempSubscription = 0
} else
client.connectToHost()
}
}
RowLayout {
enabled: client.state === MqttClient.Connected
Layout.columnSpan: 2
Layout.fillWidth: true
Label {
text: "Topic:"
}
TextField {
id: subField
placeholderText: "<Subscription topic>"
Layout.fillWidth: true
enabled: tempSubscription === 0
}
Button {
id: subButton
text: "Subscribe"
visible: tempSubscription === 0
onClicked: {
if (subField.text.length === 0) {
console.log("No topic specified to subscribe to.")
return
}
tempSubscription = client.subscribe(subField.text)
tempSubscription.messageReceived.connect(addMessage)
}
}
}
ListView {
id: messageView
model: messageModel
height: 300
width: 200
Layout.columnSpan: 2
Layout.fillHeight: true
Layout.fillWidth: true
clip: true
delegate: Rectangle {
width: messageView.width
height: 30
color: index % 2 ? "#DDDDDD" : "#888888"
radius: 5
Text {
text: payload
anchors.centerIn: parent
}
}
}
Label {
function stateToString(value) {
if (value === 0)
return "Disconnected"
else if (value === 1)
return "Connecting"
else if (value === 2)
return "Connected"
else
return "Unknown"
}
Layout.columnSpan: 2
Layout.fillWidth: true
color: "#333333"
text: "Status:" + stateToString(client.state) + "(" + client.state + ")"
enabled: client.state === MqttClient.Connected
}
}
}
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