cbh6

// you can define router
// and add a switch with all routes as a child of a "Main layout component" called app

import React from 'react';
import { render } from 'react-dom';
import createHistory from 'history/createBrowserHistory';
import { Router, Route, Redirect, Switch } from 'react-router-dom';

const history = createHistory();

cbh6

var mqtt = require('mqtt')
var client  = mqtt.connect('mqtt://test.mosquitto.org')

client.on('connect', function () {
  client.subscribe('presence')
  client.publish('presence', 'Hello mqtt')
})

client.on('message', function (topic, message) {
  // message is Buffer

cbh6

const mqtt = require('mqtt');

class MqttHandler {
  constructor() {
    this.mqttClient = null;
    this.host = 'YOUR_HOST';
    this.username = 'YOUR_USER'; // mqtt credentials if these are needed to connect
    this.password = 'YOUR_PASSWORD';
  }
  

cbh6

var express = require("express");
var bodyParser = require("body-parser");
var app = express();
var mqttHandler = require('./mqtt_handler');

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }))

var mqttClient = new mqttHandler();
mqttClient.connect();