UWP VS2017 Raspberry Pi3 - Configuration of SerialPort and Beybinding to TextBox

Attached is a project created in VS2017. It is a Windows Universal Platform project thats goal is to run on a Raspberry Pi3 The project got 2 problems * Serial port configuration * Keybinding to TextBox SerialPort During development I want to use virtual comports (se attached file) I configure the virtual comports to be a bridge. COM1 will talk to COM2 using a virtual null-modem. During testing I will send/receive from COM1 and my mockup will respond at COM2. ====> How do I configure the Comport OPEN(). I cant find the virtual port(s). They are visible in Device Manager and I am able to access then in C#.Net but not UWP. Keybinding The textbox will use input from a "keyboard emulating device" that sends a serialnumber and ends the string with Enter. ( 1234567890 + Enter) I have tried to use "code-behind" to catch the Enter-key but my solution will fire twice and its allowed to fire only once. ====> Create a more XAML solution This is a my best try.. But I did not work in UWP Here is an approach that to me seems quite straightforward, and easier that adding an AttachedBehaviour (which is also a valid solution). We use the default UpdateSourceTrigger (LostFocus for TextBox), and then add an InputBinding to the Enter Key, bound to a command. The xaml is as follows <TextBox Grid.Row="0" Text="{Binding Txt1}" Height="30" Width="150"> <[login to view URL]> <KeyBinding Gesture="Enter" Command="{Binding UpdateText1Command}" CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type TextBox}},Path=Text}" /> </[login to view URL]> </TextBox> Then the Command methods are Private Function CanExecuteUpdateText1(ByVal param As Object) As Boolean Return True End Function Private Sub ExecuteUpdateText1(ByVal param As Object) If TypeOf param Is String Then Txt1 = CType(param, String) End If End Sub And the TextBox is bound to the Property Public Property Txt1 As String Get Return _txt1 End Get Set(value As String) _txt1 = value OnPropertyChanged("Txt1") End Set End Property Source copied from [login to view URL]