Änderung Controller

templates/display.html

@@ -172,9 +172,15 @@
       } catch (_) {}
     }
 
+    function heartbeat() {
+      fetch('/api/display/ping', { method: 'POST' }).catch(() => {});
+    }
+
     window.addEventListener('load', () => {
       poll();
+      heartbeat();
       setInterval(poll, 1500);
+      setInterval(heartbeat, 5000);
     });
   </script>
 </body>