index.js

#!/usr/bin/env node
const Koa = require('koa');
const app = new Koa()
const Router = require('koa-router')
const WebSocket = require('ws');
const mqtt = require('mqtt');
const json = require('koa-json');
const path = require('path');
const render = require('koa-ejs')
const router = Router();
const port = 9001


var LightOnOff = 'false';
var LightConnected = 'false';

render(app, {
  root: path.join(__dirname, 'views'),
  layout: 'layout',
  viewExt: 'html',
  cashe: false,
  debug: false,
})

const wss = new WebSocket.Server({
  port: 3000,
  perMessageDeflate: {
    zlibDeflateOptions: {
      // See zlib defaults.
      chunkSize: 1024,
      memLevel: 7,
      level: 3
    },
    zlibInflateOptions: {
      chunkSize: 10 * 1024
    },
    // Other options settable:
    clientNoContextTakeover: true, // Defaults to negotiated value.
    serverNoContextTakeover: true, // Defaults to negotiated value.
    serverMaxWindowBits: 10, // Defaults to negotiated value.
    // Below options specified as default values.
    concurrencyLimit: 10, // Limits zlib concurrency for perf.
    threshold: 1024 // Size (in bytes) below which messages
    // should not be compressed.
  }
});
const connection = new WebSocket('ws://localhost:3000')

router.post('/ExteriorLightOnOff', onoff);

router.get('/Lights', async ctx =>{  
await ctx.render('lights');
    if (LightConnected == "false"){
      lightConnected = 'true';
      const connection = new WebSocket('ws://localhost:3000')
      wss.on('connection', function connection(ws) {
        const client = mqtt.connect('mqtt.coventry.ac.uk', {
          host: 'mqtt.coventry.ac.uk', 
          protocol: 'mqtts',
          username: '302CEM',
          password: 'n3fXXFZrjw',
          port: 8883,  
        })
        
        client.on('connect', function () {
          client.subscribe('302CEM/Team2/kailad', function (err) {
            if (!err){
              client.publish('302CEM/Team2/kailad', 'Subbed')
            }
          })
        })
      });
    }
    else {
    }
})

async function onoff(ctx) {
  wss.on('connection', function connection(ws) {
      const client = mqtt.connect('mqtt.coventry.ac.uk', {
        host: 'mqtt.coventry.ac.uk', 
        protocol: 'mqtts',
        username: '302CEM',
        password: 'n3fXXFZrjw',
        port: 8883,  
      })

      if (LightOnOff == 'false'){
      client.on('connect', function () {
        client.subscribe('302CEM/Team2/kailad', function (err) {
          if (!err){
            LightOnOff = 'true';
            client.publish('302CEM/Team2/kailad', 'Turn on the Exterior Light')
            client.end()
          }
        })
      })
      }
      else if (LightOnOff == 'true'){
        client.on('connect', function () {
          client.subscribe('302CEM/Team2/kailad', function (err) {
            if (!err){
              LightOnOff = 'false';
              client.publish('302CEM/Team2/kailad', 'Turn off the Exterior Light')
              client.end()
            }
          })
        })
      }
  });
  ctx.redirect('/lights')
}
router.get ('/temperature', async ctx =>{  
  await ctx.render('temperature');
   const connection = new WebSocket('ws://localhost:3000')
    wss.on('connection', function connection(ws) {
        const client = mqtt.connect('mqtt.coventry.ac.uk', {
          host: 'mqtt.coventry.ac.uk', 
          protocol: 'mqtts',
          username: '302CEM',
          password: 'n3fXXFZrjw',
          port: 8883,  
        })
        
        client.on('connect', function () {
          client.subscribe('302CEM/Team2/temp01', function (err) {
            if (!err){
              client.publish('302CEM/Team2/temp01', 'subbed')
            }
          })
        })

        client.on('message', function(topic, message, packet){
          ws.send(`${message}`)
        })
    });
})
app.use(json()); 
app.use(router.routes());
module.exports = app.listen(port, () => console.log(`listening on port ${port}`))


//mosquitto_sub -v -h mqtt.coventry.ac.uk --cafile mqtt.crt -p 8883  -u 302CEM -P n3fXXFZrjw -t 302CEM/Team2/kailad
//mosquitto_pub -h mqtt.coventry.ac.uk -p 8883 --cafile mqtt.crt -u 302CEM -P n3fXXFZrjw -t 302CEM/Team2/kailad  -m "why doesnt mqtt work?"