Added general websocket server

ws_server.js

@@ -0,0 +1,48 @@
+//ws_server.js
+//
+// WebSocket Server in JavaScript
+
+
+
+// Create an HTTP server
+const PORT = process.env.PORT || 3000;
+const INDEX = '/index.html';
+
+const express = require('express');
+const server = express()
+  .use((req, res) => res.sendFile(INDEX, { root: __dirname }))
+  .listen(PORT, () => console.log(`Listening on ${PORT}`));
+
+// Create a WebSocket server
+const { Server } = require('ws');
+
+const wss = new Server({ server });
+
+
+// Handle connections
+wss.on('connection', (ws) => {
+  console.log('Client connected');
+
+  // Handle when received data
+  // Brige data to all clients
+  ws.onmessage = function(evt) {
+    console.log(evt.data);
+    wss.clients.forEach((client) => {
+      client.send(evt.data);
+    });
+  }
+
+  // Handle when closed
+  //ws.on('close', () => console.log('Client disconnected'));
+  ws.onclose = function() {
+    console.log('Client disconnected')
+  }
+});
+
+
+// Broadcast updates
+//setInterval(() => {
+//  wss.clients.forEach((client) => {
+//    client.send(new Date().toTimeString());
+//  });
+//}, 1000);