B4R Question Can UART on Arduino Zero be used in a sketch?

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 300
#End Region

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Public Serial1 As Serial
   ' Public timer1 As Timer
    Public stream As AsyncStreams
End Sub

Private Sub AppStart
    'timer1.Initialize("timer1_Tick",1000)
    Serial1.Initialize(115200)
    stream.Initialize(Serial1.Stream,"stream_NewData","stream_Error")
    'timer1.Enabled=True
End Sub
Sub timer1_Tick
    'stream.Write(Array As Byte(0x41,0x42,0x43,0xA))
End Sub
Sub stream_NewData (Buffer() As Byte)
    stream.Write(Buffer)
End Sub
Sub stream_Error
    ' Log("Errore...")
End Sub