B4R Question Wemos D1 R2 - UDP sending to broadcast address 255.255.255.255 fails to send

Sub Process_Globals
        Private udp As WiFiUDP
End Sub

Private Sub AppStart

    Serial1.Initialize(115200)
    Log("AppStart")

        udp.Initialize(4102,"udp_PacketArrived")

    DoConnect ' connects fine, and i can see the Bootp/DHCP request

End Sub

Sub timer1_tick
    If wifi.IsConnected  = True Then
            Log("MyIP ",wifi.LocalIp )

            'this does not seem to work?
            udp.BeginPacket("255.255.255.255",4101)
            udp.Write("test".GetBytes)
            udp.SendPacket

        Else
            Log("Wifi not connected")
    End If
End Sub

Sub udp_PacketArrived (Data() As Byte, Ip() As Byte, Port As UInt)

    Log("PacketArrived from:")
    PrintIp(Ip)
    log(Data.Length)
End Sub

Sub PrintIp(ip() As Byte)
    Log(ip(0),".", ip(1),".", ip(2),".", ip(3))
End Sub

Sub DoConnect

        Log("Wifi trying to connect")
        If WifiConnect Then '(use Connect2 if a password is required).
            Log("Connected to wireless network.")

        Else
            Log("Failed to connect.")

        End If

End Sub


Sub WifiConnect() As Boolean
    Dim l As Int
    Log("Wifi ssid: digger ")
    If wifi.Connect2("digger","apassword") Then Return True
    Return False 'can not connect
End Sub