Create socket connection and send a message

server.js

@@ -7,6 +7,12 @@ app.get('/hello', function (req, res) {
   res.send('Hello World!')
 })
 
-app.listen(3000, function () {
+const server = app.listen(3000, function () {
   console.log('Example app listening on port 3000!')
 })
+
+const io = require('socket.io').listen(server);
+
+io.on('connection', (socket) => {
+    socket.emit('message', 'hello socket');
+});