The monitor item is now actually used to display information on monitor page

The UM3 now provides camera image in this way

CURA-3826

plugins/UM3NetworkPrinting/MonitorItem.qml

@@ -0,0 +1,40 @@
+import QtQuick 2.2
+import QtQuick.Controls 1.1
+import QtQuick.Controls.Styles 1.1
+import QtQuick.Layouts 1.1
+import QtQuick.Dialogs 1.1
+
+import UM 1.3 as UM
+import Cura 1.0 as Cura
+
+Component
+{
+    Image
+    {
+        id: cameraImage
+        width: sourceSize.width
+        height: sourceSize.height * width / sourceSize.width
+        anchors.horizontalCenter: parent.horizontalCenter
+        //anchors.verticalCenter: parent.verticalCenter
+        //anchors.horizontalCenterOffset: - UM.Theme.getSize("sidebar").width / 2
+        //visible: base.monitoringPrint
+        onVisibleChanged:
+        {
+            if(visible)
+            {
+                OutputDevice.startCamera()
+            } else
+            {
+                OutputDevice.stopCamera()
+            }
+        }
+        source:
+        {
+            if(OutputDevice.cameraImage)
+            {
+                return OutputDevice.cameraImage;
+            }
+            return "";
+        }
+    }
+}

plugins/UM3NetworkPrinting/NetworkPrinterOutputDevice.py

@@ -178,6 +178,7 @@ class NetworkPrinterOutputDevice(PrinterOutputDevice):
         self._last_command = ""
 
         self._compressing_print = False
+        self._monitor_view_qml_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "MonitorItem.qml")
 
         printer_type = self._properties.get(b"machine", b"").decode("utf-8")
         if printer_type.startswith("9511"):