Added restart settings.

src/app.rs

@@ -172,6 +172,12 @@ impl eframe::App for App {
             self.update_start_stop();
         }
 
+        // Send stop command when the window is closed
+        if ctx.input(|i| i.viewport().close_requested()) {
+            self.on = false;
+            self.update_start_stop();
+        }
+
         ctx.request_repaint();
     }}