use npm websocket library

api/index.js

@@ -1,24 +1,29 @@
-var express = require('express');
+var express = require("express");
 var app = express();
+import WebSocket from "ws";
 
-websocket = new WebSocket("ws://10.100.0.40:9001/");
+var ws = new WebSocket("ws://10.100.0.40:9001/");
 
-websocket.onopen = (evt) => { log("OPENED websocket"); };
+ws.on('open', function open() {
+    console.log("connected");
+  });
 
-websocket.onmessage = (message) => {
+ws.on("message", function message(message) {
-    var msg = JSON.parse(message.data);
+  var msg = JSON.parse(message);
-    log("RECEIVED: " + msg);
+  console.log("RECEIVED: " + msg);
-}
+});
+
+ws.on("error", console.error);
 
 // set the view engine to ejs
-app.set('view engine', 'ejs');
+app.set("view engine", "ejs");
 
 // use res.render to load up an ejs view file
 
 // index page
-app.get('/', function(req, res) {
+app.get("/", function (req, res) {
-  res.render('index');
+  res.render("index");
 });
 
 app.listen(8080);
-console.log('Server is listening on port 8080');
+console.log("Server is listening on port 8080");