Vue-Paho-Mqtt Plugin

The vue-paho-mqtt plugin provides a convenient way to use the Eclipse Paho MQTT JavaScript client with Vue 3.

This plugin allows you to connect to a MQTT broker and subscribe to topics in your Vue app. It uses paho-mqtt to connect to the broker and provides several useful features such as auto-reconnect, message handlers, and error notifications.

Live demo

Table of contents

• Installation
• Setup
  • Vite / VueCLI
  • Quasar
  • Nuxt3
• Options
  • Plugin Options
  • MQTT Options
  • MQTT Quality of Service (QoS) and Retention Options for Publish
• Notification Alerts
• Global MQTT client instance: $mqtt
  • connect()
  • disconnect()
  • subscribe()
  • publish()
  • host()
  • port()
  • path()
  • username()
  • password()
  • clientId()
  • mainTopic()
  • unsubscribe()
  • unsubscribeAll()
  • status()
• Usage Example
  • Vue Options API
  • Vue Composition API
• Contributing
• License
• Credits
  • Contact
• Changelog
• Security

Installation

Install the package using npm:

1npm install vue-paho-mqtt

---

Setup

To use the plugin, you need to create an instance of it and pass it to the use function:

Vite / VueCLI

1// src/main.ts
2import App from './App.vue';
3import { createApp } from 'vue';
4import { createPahoMqttPlugin } from 'vue-paho-mqtt';
5
6createApp(App)
7  .use(
8    createPahoMqttPlugin({
9      PluginOptions: {
10        autoConnect: true,
11        showNotifications: true,
12      },
13
14      MqttOptions: {
15        host: 'localhost',
16        port: 9001,
17        clientId: `MyID-${Math.random() * 9999}`,
18        mainTopic: 'MAIN',
19      },
20    }),
21  )
22  .mount('#app');

Quasar Framework (quasar boot)

1import { boot } from 'quasar/wrappers';
2import { createPahoMqttPlugin } from 'vue-paho-mqtt';
3
4export default boot(({ app }) => {
5  app.use(
6    createPahoMqttPlugin({
7      PluginOptions: {
8        autoConnect: true,
9        showNotifications: true,
10      },
11
12      MqttOptions: {
13        host: 'localhost',
14        port: 9001,
15        clientId: `MyID-${Math.random() * 9999}`,
16        mainTopic: 'MAIN',
17      },
18    }),
19  );
20});

Nuxt3 (nuxt plugins)

1import { createPahoMqttPlugin } from 'vue-paho-mqtt';
2export default defineNuxtPlugin({
3  name: 'vue-paho-mqtt',
4  enforce: 'pre',
5  async setup(nuxtApp) {
6    nuxtApp.vueApp.use(
7      createPahoMqttPlugin({
8        PluginOptions: {
9          autoConnect: true,
10          showNotifications: true,
11        },
12        MqttOptions: {
13          host: 'localhost',
14          port: 9001,
15          clientId: `MyID-${Math.random() * 9999}`,
16          mainTopic: 'MAIN',
17        },
18      }),
19    );
20  },
21  hooks: {
22    'app:created'() {
23      const nuxtApp = useNuxtApp();
24    },
25  },
26});

---

Options

Plugin Options

You can configure the plugin by passing an object with the following options to createPahoMqttPlugin:

• showNotifications (boolean, default: true) - Whether to show error and success notifications.

• autoConnect (boolean, default: true) - Whether to automatically connect to the broker when the plugin is initialized.

MQTT Options

You can configure the MQTT client by passing an object with the following options to createPahoMqttPlugin:

• host (string, default: "localhost") - The hostname or IP address of the MQTT broker.

• port (number, default: 9001) - The port number of the MQTT broker.

• useSSL (boolean, default: false) - Whether to use SSL when connecting to the broker.

• clientId (string, default: "ClientID-${Math.random() * 9999}}") - The client identifier to use when connecting to the broker.

• username (string, default: "") - The username to use when connecting to the broker.

• password (string, default: "") - The password to use when connecting to the broker.

• mainTopic (string, default: "MAIN") - If enaled, the topic that will be prepended to the topic specified during the $mqtt.publish and $mqtt.subscribe (can be manually disabled in $mqtt.publish and $mqtt.subscribe).

• enableMainTopic (boolean, default: true) - Enables usage of the main topic.

• watchdogTimeout (number, default: 30000) - The time in milliseconds to wait for a connection to the broker before timing out.

• reconnectTimeout (number, default: 5000) - The time in milliseconds to wait before attempting to reconnect to the broker after a disconnection.

• keepAliveInterval (number, default: 60000) - The server disconnects this client if there is no activity for this number of milliseconds.

• cleanSession (boolean, default: true) - Whether to delete the server persistent state on a new connection.

---

MQTT Quality of Service (QoS) and Retention Options for Publish

The MQTT protocol provides Quality of Service (QoS) levels to control the reliability of message delivery between a publisher and a subscriber. Additionally, it provides the ability to retain messages, allowing subscribers to receive messages even if they connect after the message has been published.

The following are the MQTT QoS and retention options available for publishing messages:

type	Option	QoS Level	Retain
string	B	0	false
string	Br	0	true
string	Q	1	false
string	Qr	1	true
string	F	2	true
string	Fnr	2	false

• B: QoS 0, non-retained message. The message is delivered at most once, and the broker does not store the message for future subscribers.

• Br: QoS 0, retained message. The message is delivered at most once, and the broker stores the message for future subscribers.

• Q: QoS 1, non-retained message. The message is delivered at least once, and the broker stores it until the publisher receives an acknowledgment from the subscriber.

• Qr: QoS 1, retained message. The message is delivered at least once, and the broker stores it until the publisher receives an acknowledgment from the subscriber. The broker also stores the message for future subscribers.

• F: QoS 2, retained message. The message is delivered exactly once, and the broker stores it for future subscribers.

• Fnr: QoS 2, non-retained message. The message is delivered exactly once, and the broker does not store it for future subscribers.

1type MqttMode = 'B' | 'F' | 'Q' | 'Qr' | 'Br' | 'Fnr';

Example Usage with the $mqtt.publish

1$mqtt.publish('test/topic', 'Hello, world!', 'Fnr');

---

Notification Alerts

The Vue Paho MQTT plugin comes with built-in notifications using SweetAlert2 library to display the notification alerts. This library is already installed with the plugin.

• PluginOptions.showNotifications (boolean, default: true) - Whether to show error and success alert notifications.

1createPahoMqttPlugin({
2      PluginOptions: {
3        showNotifications: true,
4        ...
5      }
6      ...

On	Icon	Title	Content	Timer
Connection Success	success	"Connected"	"MQTT Connected"	1500
Connection Failure	error	"Mqtt Error"	"MQTT failed to connect"	-
Connection Timeout	error	"Mqtt Error"	"Broker connection timed out"	-
Connection Lost	error	"Mqtt Error"	"MQTT connection lost"	-
Disconnect Error	error	"Error"	catch(error) => error.message	-
Connect Error	error	"Error"	catch(error) => error.message	-

---

Global MQTT client instance: $mqtt

Connect

Connect to the MQTT broker. Shows a dialog notification in case of error if the plugin is configured to do so. Custom callbacks can be passed to the connect function. Such as onConnect, onFailure, onConnectionLost, onMessageArrived.

• onConnect(): resolves the promise to true if the connection was successful.
• onFailure(): rejects the promise to false if the connection was unsuccessful.
• onConnectionLost(): returns an response object with the following properties:
  • errorCode: the error code.
• onMessageArrived(): returns a message object with the following properties:
  • payloadString: the message payload as a string.
  • destinationName: the name of the topic that the message was published to.

Note: Inside the 'subscribe' function a function is passed to the 'onMessageArrived' callback. This function is used to parse the message payload and return the parsed message inside the subscribe function where it is called. You don't really need to handle arriving messages in the 'onMessageArrived' callback.

Type Definition

1const connect: ({
2  onConnect?: ((...args: unknown[]) => unknown) | undefined;
3  onFailure?: ((...args: unknown[]) => unknown) | undefined;
4  onConnectionLost?:
5    | ((
6        responseObject: {
7          errorCode: number;
8        },
9        ...args: unknown[]
10      ) => unknown)
11    | undefined;
12  onMessageArrived?:
13    | ((
14        message: {
15          payloadString: string;
16          destinationName: string;
17        },
18        ...args: unknown[]
19      ) => unknown)
20    | undefined;
21}) => Promise<boolean>;

Usage

1// Composition API
2import { $mqtt } from 'vue-paho-mqtt';
3$mqtt.connect();
4
5// Options API
6this.$mqtt.connect();
7
8// or use it with async/await
9const result = await $mqtt.connect();
10// result will return "true" if the connection was successful

Optional Custom Callbacks

Callback	When	Return
onConnect	successfully connected to the mqtt broker	-
onFailure	failed to connect to the mqtt broker	-
onConnectionLost	disconnected or connection lost connection	responseObject: {errorCode: number}
onMessageArrived	message arrived from one of the subscribed topics	message: {payloadString: string;destinationName: string;}

Custom Callback Usage example

1$mqtt.connect({
2  onConnect: () => {
3    console.log('Mqtt connected');
4  },
5  onFailure: () => {
6    console.log('Mqtt connection failed');
7  },
8  onConnectionLost: (error: any) => {
9    console.log('Error:', error.message);
10  },
11  onMessageArrived: (message: {
12    payloadString: string;
13    destinationName: string;
14  }) => {
15    console.log(
16      'Message Arrived:',
17      message.payloadString,
18      message.destinationName,
19    );
20  },
21});

---

Disconnect

Disconnect from the mqtt broker. Shows a dialog notification in case of error if the plugin is configured to do so.

Type Definition

1const disconnect: () => Promise<boolean>;

Usage

1// Composition API
2import { $mqtt } from 'vue-paho-mqtt';
3$mqtt.disconnect();
4
5// Options API
6this.$mqtt.disconnect();
7
8// or use it with async/await
9const result = await $mqtt.disconnect();
10// result will return "true" if the disconnection was successful

---

Subscribe

It is used to subscribe to the topic specified, and to define the function to call when the specified topic recieves a message.

param	type	explanation	default
topic	string	MQTT topic to subscribe (ie: 'my/test/topic')	-
onMessage	function	Arrow function with a parameter to be fired when a message arrives to the specified topic	-
useMainTopic	boolean	main topic defined in the MQTT Options will be prepended to the topic specified	true

Type Definition

1const subscribe: (
2  topic: string,
3  onMessage: (data: string, ...args: unknown[]) => unknown,
4  useMainTopic?: boolean,
5) => void;

Subscribe usage example

1// if the enableMainTopic is true, subscribe to 'MAIN/my/topic'
2this.$mqtt.subscribe('my/topic', (data: string) => {
3  console.log(data, 'recieved');
4});
5
6// even if the enableMainTopic is true, subscribe to 'my/topic'
7this.$mqtt.subscribe(
8  'my/topic',
9  (data: string) => {
10    console.log(data, 'recieved');
11  },
12  false,
13);

Composition API

1import { $mqtt } from 'vue-paho-mqtt';
2
3$mqtt.subscribe('my/topic', (data: string) => {
4  console.log(data, 'recieved');
5});

---

Publish

Used to publish string data to the topic specified.

Type Definition

1const publish: (
2  topic: string,
3  payload: string,
4  mode: MqttMode,
5  useMainTopic?: boolean,
6) => void;

param	type	explanation	default
topic	string	MQTT topic to publish (ie: 'my/test/topic')	-
payload	string	string payload to send	-
mode	MqttMode	See MQTT Quality of Service (QoS) and Retention Options for Publish for detailed explanation for mqtt mode options.  ["B" | "F" | "Q" | "Qr" | "Br" | "Fnr"]	-
useMainTopic	boolean	main topic defined in the MQTT Options will be prepended to the topic specified	true

Publish usage example

1// if the enableMainTopic is true, publish to 'MAIN/my/topic'
2// 'Fnr' => Qos: 2 , retained: false
3this.$mqtt.publish('test/topic', 'Hello, world!', 'Fnr');
4
5// even if the enableMainTopic is true, publish to 'my/topic'
6// 'B' => Qos: 0 , retained: false
7this.$mqtt.publish('test/topic', 'Hello, world!', 'B', false);
8
9// if the enableMainTopic is true, publish to 'MAIN/my/topic'
10// 'Qr' => Qos: 1 , retained: true
11this.$mqtt.publish('test/topic', 'Hello, world!', 'Qr');
12
13// payload: "Hello, world!"

Composition API

1import { $mqtt } from 'vue-paho-mqtt';
2
3$mqtt.publish('test/topic', 'Hello, world!', 'Qr');

---

Host

Get or set the host parameter from the MQTT Options.

Type Definition

1const host: (e?: string) => string;

Get Host

1$mqtt.host(); // ie: "localhost"

Set MQTT host

1$mqtt.host('192.168.0.1');

Example usage

1<template>
2  <label>MQTT host: {{ $mqtt.host() }}</label>
3</template>

1onMounted(() => {
2  console.log(this.$mqtt.host());
3});

Composition API

1import { onMounted } from 'vue';
2import { $mqtt } from 'vue-paho-mqtt';
3
4onMounted(() => {
5  console.log($mqtt.host());
6});

---

Port

Get or set the port parameter from the MQTT Options.

Type Definition

1const port: (e?: number) => number;

Get Port

1$mqtt.port(); // ie: 9001

Set MQTT port

1$mqtt.port(1234);

Example usage

1<template>
2  <label>MQTT port: {{ $mqtt.port() }}</label>
3</template>

1onMounted(() => {
2  console.log(this.$mqtt.port());
3});

Composition API

1import { onMounted } from 'vue';
2import { $mqtt } from 'vue-paho-mqtt';
3onMounted(() => {
4  console.log($mqtt.port());
5});

---

Path

Get or set the path parameter from the MQTT Options.

Type Definition

1const path: (e?: string) => string;

Get Path

1$mqtt.path(); // ie: "/mqtt"

Set MQTT path

1$mqtt.path('/ws/mqtt');

Example usage

1<template>
2  <label>MQTT path: {{ $mqtt.path() }}</label>
3</template>

1onMounted(() => {
2  console.log(this.$mqtt.path());
3});

Composition API

1import { onMounted } from 'vue';
2import { $mqtt } from 'vue-paho-mqtt';
3
4onMounted(() => {
5  console.log($mqtt.path());
6});

---

Username

Get or set the username parameter from the MQTT Options.

Type Definition

1const username: (e?: string) => string;

Get Username

1$mqtt.username(); // ie: ""

Set MQTT username

1$mqtt.username('testUsername');

Example usage

1<template>
2  <label>MQTT username: {{ $mqtt.username() }}</label>
3</template>

1onMounted(() => {
2  console.log(this.$mqtt.username());
3});

Composition API

1import { onMounted } from 'vue';
2import { $mqtt } from 'vue-paho-mqtt';
3
4onMounted(() => {
5  console.log($mqtt.username());
6});

---

Password

[!CAUTION] Exposing the password to the client can cause security issues if not used properly.

Get or set the password parameter from the MQTT Options.

Type Definition

1const password: (e?: string) => string;

Get Password

1$mqtt.password(); // ie: ""

Set MQTT password

1$mqtt.password('secret');

Example usage

1<template>
2  <label>MQTT password: {{ $mqtt.password() }}</label>
3</template>

1onMounted(() => {
2  console.log(this.$mqtt.password());
3});

Composition API

1import { onMounted } from 'vue';
2import { $mqtt } from 'vue-paho-mqtt';
3
4onMounted(() => {
5  console.log($mqtt.password());
6});

---

Client ID

Get or set the clientId parameter from the MQTT Options.

Type Definition

1const clientId: (e?: string) => string;

Get clientId

1$mqtt.clientId(); // ie: "MyID-234"

Set clientId

1$mqtt.clientId('MyNewClientId');

Example usage

1<template>
2  <label>MQTT client id: {{ $mqtt.clientId() }}</label>
3</template>

1onMounted(() => {
2  console.log(this.$mqtt.clientId());
3});

Composition API

1import { onMounted } from 'vue';
2import { $mqtt } from 'vue-paho-mqtt';
3
4onMounted(() => {
5  console.log($mqtt.clientId());
6});

---

Main Topic

Get or set the mainTopic parameter from the MQTT Options.

Type Definition

1const mainTopic: (e?: string) => string | undefined;

Get mainTopic

1$mqtt.mainTopic(); // ie: "MyID-234"

Set MQTT mainTopic

1$mqtt.mainTopic('MyNewClientId');

Example usage

1<template>
2  <label>MQTT mainTopic: {{ $mqtt.mainTopic() }}</label>
3</template>

1onMounted(() => {
2  console.log(this.$mqtt.mainTopic());
3});

Composition API

1import { onMounted } from 'vue';
2import { $mqtt } from 'vue-paho-mqtt';
3
4onMounted(() => {
5  console.log($mqtt.mainTopic());
6});

---

Unsubscribe

Used to unsubscribe from the topic specified

Type Definition

1const unsubscribe: (topic: string, useMainTopic?: boolean) => void;

param	type	explanation	default
topic	string	MQTT topic to unsubscribe (ie: 'my/test/topic')	-
useMainTopic	boolean	main topic defined in the MQTT Options will be prepended to the topic specified	true

Unsubscribe usage example

1// if the enableMainTopic is true, unsubscribe from 'MAIN/my/topic'
2$mqtt.unsubscribe('test/topic');
3
4// even if the enableMainTopic is true, unsubscribe from 'my/topic'
5$mqtt.unsubscribe('test/topic', false);

---

Unsubscribe All

Used to unsubscribe from all the topics subscribed previously.

Type Definition

1const unsubscribeAll: () => void;

Usage

1$mqtt.unsubscribeAll();

---

Status

Used to get the status of the mqtt connection.

Type Definition

1type MqttStatus =
2  | 'connected'
3  | 'disconnected'
4  | 'connecting'
5  | 'error'
6  | 'lost'
7  | null;
8
9const status: () => MqttStatus;

Get MQTT Status

1$mqtt.status(); // ie: "connected"

Example usage

1<template>
2  <label>MQTT Status: {{ $mqtt.status() }}</label>
3</template>

1onMounted(() => {
2  console.log($mqtt.status());
3});

---

Usage Example

Vue Options API

1mounted() {
2  // Connect to the mqtt broker
3  this.$mqtt.connect();
4
5  // Subscribe to a topic
6  this.$mqtt.subscribe("test/topic", (message: string) => {
7    console.log("Received message:",  message);
8  });
9
10  // Publish a message
11  this.$mqtt.publish("test/topic",  "Hello, world!",  "F");
12
13  // Disconnect from the broker
14  this.$mqtt.disconnect();
15}

Vue Composition API

1<script setup lang="ts">
2
3import { onMounted }  from  "vue";
4import { $mqtt } from 'vue-paho-mqtt';
5
6onMounted(() => {
7  // Connect to the mqtt broker
8  $mqtt.connect();
9
10  // Subscribe to a topic
11  $mqtt.subscribe("test/topic", (message: string) => {
12    console.log("Received message:",  message);
13  });
14
15  // Publish a message
16  $mqtt.publish("test/topic",  "Hello, world!",  "F");
17
18   // Disconnect from the broker
19  $mqtt.disconnect();
20});
21
22</script>
23

Contributing

Contributions to the project is highly appreciated. If you have any suggestions/questions/requests please consider opening an issue. If you want to contribute to the project, fixing an open issue is greatly recommended and appreciated. To see the all contribution rules please check the contribution rules.

License

This project is licensed under MIT License if you want to see more, please check LICENSE for more information.

Credits

This project is created and actively maintained by kaandesu and EgeOnder

Contact

Maintainer	E-Mail	Twitter
kaandesu	kaandesu00@gmail.com	-
EgeOnder	40398628+EgeOnder@users.noreply.github.com	@EgeOnder23

Changelog

Please see CHANGELOG for more information on what has changed recently.

Security

The security policy of the project can be found in SECURITY.md. If you find any security issues, please refer to the policy. Thank you.