WIN10 IoT development Serial? Device returns null

Raspberry Pi 3,win10 Iot, serial port development, copy example, serial port get return always NULL, example but can, code, Internet query results are as follows:

https://stackoverflow.com/questions/34160376/ Windows-universal-app-serial-ports-wont-open-serialdevice-fromidasync-always-n

So Microsoft does not mention this need to add something to the app manifest for serial communication Nor is there a tic K box in the app manifest GUI for serial communication.

The following needs to is added to your app manifest (create the section <Capabilities> if it doesn ' t exist):

<Capabilities>  <Devicecapability name= "serialcommunication" >  <device id= "any" > < function type= "name: SerialPort " /> </ device> </ Devicecapability></capabilities< Span class= "pun" >>              

UPDATE 10/2016

Microsoft has updated their documentation to reflect this requirement.

Https://msdn.microsoft.com/en-us/library/windows/apps/windows.devices.serialcommunication.aspx

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WIN10 IoT development Serial? Device returns null