MusQueTTe

Use MQTT with RXJS in node or in the browser with MQTT over WebSocket. Docs

The API is similar to the rxjs internal WebSocket implementation for consistency but replaces the multiplex operator with topics.]

Installation

yarn add musquette
# or
npm install musquette

Import via

import { MQTTSubject } from 'musquette'
// or
import { MQTTSubject } from 'musquette/dist/lib/musquette'

Usage

Establish a connection and listen on a topic:

It is assumed that the payload is JSON parseable string.

import { MQTTSubject } from 'musquette'

let mqtt = new MQTTSubject(`ws://localhost:9001`)
let topic = mqtt.topic(`test/topic`)

topic.subscribe({
  next: message => console.log(message.test) // "test",
  error: console.error
})

// or if you are not interested in errors
topic.subscribe(message => console.log(message.test)) // "test

// publish when call on a topic only expects a payload
//
topic.publish({
  test: 'test'
})

Send a payload without subscribing to a topic

import { MQTTSubject } from 'musquette'

let mqtt = new MQTTSubject(`ws://localhost:9001`)

// next expects an MQTTMessage object that consists at least
// of a topic and a message property
mqtt.next({
  topic: 'test/topic',
  message: {
    test: 'test'
  }
})

// publish on a connection expects two arguments: a topic and payload
mqtt.publish('test/topic', {
    test: 'test'
  }
})

This is equivalent to the first method but does not subscribe to the topic

Options

import { Subject, Observable, merge } from 'rxjs'
import { mapTo } from 'rxjs/operators'
import { MQTTSubject } from 'musquette/dist/lib/musquette.js'

let connected$ = new Subject()
let disconnecting$ = new Subject()
let disconnected$ = new Subject()

merge(
  connected$,
  disconnecting$.pipe(mapTo('disconnecting')),
  disconnected$.pipe(mapTo('disconnected'))
).subscribe(console.log)

let mqtt = new MQTTSubject({
  url: `ws://localhost:9001`,

  // mqtt.js options
  //
  options: {
    keepalive: 3000,
    clientId:
      'mqttjs_' +
      Math.random()
        .toString(16)
        .substr(2, 8)
  },

  // function that packs the payload that is sent
  // (T) => Buffer
  //
  serializer: value => Buffer.from(JSON.stringify(value)),

  // function that unpacks the payload
  // (Buffer) => T
  //
  deserializer: message => JSON.parse(message.toString()),

  // Observer that is called when connection is established
  //
  connectObserver: connected$,

  // Observer that is called when disconnect is imminent
  //
  disconnectingObserver: disconnecting$,

  // Observer that is notified when connection has ended
  //
  disconnectObserver: disconnected$
})

mqtt.subscribe(console.log)

setTimeout(() => {
  // disconnect
  //
  mqtt.complete()
}, 5000)

NPM scripts

• npm t: Run test suite
• npm start: Run npm run build in watch mode
• npm run test:watch: Run test suite in interactive watch mode
• npm run test:prod: Run linting and generate coverage
• npm run build: Generate bundles and typings, create docs
• npm run lint: Lints code
• npm run commit: Commit using conventional commit style (husky will tell you to use it if you haven't 😉)

Credits

This library uses the copy pasted mqtt-wildcard library from Sebastian Raff.

Based on typescript library starter from @alexjoverm.

Contributors (emoji key):

This project follows the all-contributors specification. Contributions of any kind are welcome!