ajoslin103 / mqtt-client

NOTE: to regenerate the ES-2015 version after good changes execute: npm run build 


ajoslin, july 2016
    This module is intended to be used in an Aurelia project, see the singleton & logging code

    The primary reason for this code is to support a router for incoming messages.
    MQTT standard is to send all topics to a single onMessage routine (usually contining a giant switch statement)

        This code creates a wrapper around the subscribe method to associate multiple callbacks with
            each subscribed topic, the internally assigned on_message call then calls all functions associated with the received topic.

    The secondary reason is to provide a promise-based private request-reply feature, the topicReply must be the topicRequest with a /reply suffix

ajoslin, november 2017
    encapsulated this code into a module for sharing across projects
    export an instantiation to make it a singleton

ajoslin, january 2018
    changes for use by both NodeJS & Web Browser
        logger via params to remove requirement for aurelia
        test for window before doing localhostReplacement
        setup a build command to pre-compile ES6 features
        send topic along with payload on mcb

ajoslin, january 2020
    default the appName to the internal guid when not supplied
    overload constructor with single object option


sample usage -- connect from ES6 code
    import { mqttClient } from 'mqtt-client';
    mqttClient.connect('myStaticAppName');

sample usage -- connect from ES5 code
    var mqttClient = require('mqtt-client').mqttClient;
    mqttClient.connect('myStaticAppName');