The logic for 'factory3' and 'gallery3' is still in place but is not bound to the view (MainPage.xml). The view xml is commented out and not removed. This should make it easier to re-add it if the need comes about.
'factory2' was not updating its timestamp when it received a new reading. It was binding to the wrong property in MainPage.xml (view model). This changes the property to the correct one.
Craig Oates