Android Question [things] Connect Arduino to Raspberry Pi running Android Things

** Service (starter) Create **
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
UART Device: UART0
(ArrayList) [BCM12, BCM13, BCM16, BCM17, BCM18, BCM19, BCM20, BCM21, BCM22, BCM23, BCM24, BCM25, BCM26, BCM27, BCM4, BCM5, BCM6]
UART Initialized:true
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = true **
** Service (starter) Destroy **

Sub Process_Globals
    Private pm As PeripheralManager
    Private uart As UartDevice
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
...
        uart.Initialize("UART0", "uartdevice", pm)
        uart.Baudrate = 57600
        uart.StopBits = 1
        uart.Parity = uart.PARITY_NONE
        uart.DataSize = 8
..
    End If
    Activity.LoadLayout("Main")
End Sub

Sub uartdevice_DataAvailable(Buffer() As Byte)
    Log("UART Data is available: "  & Buffer.Length)
    Dim bc As ByteConverter
    Log("UART=" & bc.StringFromBytes(Buffer, "UTF8"))
End Sub

Sub timer1_tick
    Dim state As Boolean = pin22.value
    Log("Timer Tick: " & state)
    pin22.value = Not(state)
    Dim b As Byte
    If state Then b = 1 Else b = 0
    uart.Write(Array As Byte(b))
End Sub

Sub astream_NewData (Buffer() As Byte)
    Dim state As Boolean = Buffer(0) = 1
    Log("NewData: State=",state)
    led13.DigitalWrite(Not(state))
End Sub