fix: improved ping-pong events

back/libs/middlewares.js

@@ -33,6 +33,13 @@ router.ws('/', function(ws, req) {
     ws.on('close', () => {
         sockets.delete(ws);
     });
+
+    ws.on('message', (msg) => {
+        const data = JSON.parse(msg);
+        if (data.type === 'ping') {
+            ws.send(JSON.stringify({ type: 'pong' }));
+        }
+    });
 });
 
 function socketsMiddleware(req, res, next) {