diff -r bdaac24b86ed -r 449116c083bd src/MainWindow.cpp
--- a/src/MainWindow.cpp	Mon Jun 27 21:12:19 2022 +0200
+++ b/src/MainWindow.cpp	Tue Jun 28 13:26:51 2022 +0200
@@ -241,7 +241,7 @@
      * Node message are detected by the group_id object.
      * Device messages are detected by the device object.
      *
-     * Messages can be connected to client widgets so we can emit messages to them.
+     * Signals can be connected from child widgets so we can emit messages to them.
      */
     QString device = jsonMessage.object()["device"].toString();
     QString group_id = jsonMessage.object()["group_id"].toString();
@@ -253,17 +253,21 @@
 	    //qDebug() << "found co2meter" << jsonMessage.object()["node"].toString()+"/"+jsonMessage.object()["unit"].toString();
 	    emit updateCO2meters(jsonMessage.object()["node"].toString()+"/"+jsonMessage.object()["unit"].toString());
 	} else if (device == "ispindels") {
-	    qDebug() << "found iSpindel" << jsonMessage.object()["node"].toString()+"/"+jsonMessage.object()["unit"].toString();
+	    //qDebug() << "found iSpindel" << jsonMessage.object()["node"].toString()+"/"+jsonMessage.object()["unit"].toString();
 	    emit updateiSpindels(jsonMessage.object()["node"].toString()+"/"+jsonMessage.object()["unit"].toString());
 	} else {
 	    qDebug() << "unknown device" << device;
 	}
     } else if (group_id != "") {
 	emit updateNodes(jsonMessage.object()["node"].toString());
-//    } else if (jsonMessage.object()["ping"].toString() != "") {
-//	qDebug() << "ping" << jsonMessage;
+    } else if (jsonMessage.object()["ping"].toInt() ) {
+	/*
+	 * Reply to ping message. Note that the bmsd ignore's
+	 * our reply, but we send it anyway.
+	 */
+	webSocket->sendTextMessage(QString("{\"pong\":1}"));
     } else {
-	qDebug() << "unknown WS message" << message;
+	qDebug() << "unknown WS message" << message << jsonMessage;
     }
 }
 
@@ -441,7 +445,7 @@
     ui->mainStack->addWidget(MonFermentersWindow);
     ui->mainStack->setCurrentIndex(index);
     setWindowTitle( QString("BMSapp - %1 - Monitor Fermenters").arg(VERSIONSTRING));
-//    ui->menuBar->setVisible(false);
+    ui->menuBar->setVisible(false);
 }
 
 
@@ -483,7 +487,7 @@
     ui->mainStack->addWidget(MoniSpindelsWindow);
     ui->mainStack->setCurrentIndex(index);
     setWindowTitle( QString("BMSapp - %1 - Monitor iSpindels").arg(VERSIONSTRING));
-//    ui->menuBar->setVisible(false);
+    ui->menuBar->setVisible(false);
 }