minor chnage

index.js

@@ -10,6 +10,10 @@ 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',
@@ -40,14 +44,16 @@ const wss = new WebSocket.Server({
     // should not be compressed.
   }
 });
+const connection = new WebSocket('ws://localhost:3000')
 
-router.post('/ExteriorLightOn', on);
+router.post('/ExteriorLightOnOff', onoff);
 
 router.get('/Lights', async ctx =>{  
-  await ctx.render('lights');
-
-   const connection = new WebSocket('ws://localhost:3000')
-    wss.on('connection', function connection(ws) {
+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',
@@ -63,15 +69,13 @@ router.get('/Lights', async ctx =>{
             }
           })
         })
-
-        client.on('message', function(topic, message, packet){
-          ws.send(`${message}`)
-        })
-    });
+      });
+    }
+    else {
+    }
 })
 
-async function on(ctx) {
-  const connection = new WebSocket('ws://localhost:3000')
+async function onoff(ctx) {
   wss.on('connection', function connection(ws) {
       const client = mqtt.connect('mqtt.coventry.ac.uk', {
         host: 'mqtt.coventry.ac.uk', 
@@ -80,18 +84,29 @@ async function on(ctx) {
         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()
           }
         })
       })
-
-      client.on('message', function(topic, message, packet){
-        ws.send(`${message}`)
-      })
+      }
+      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')
 }