If you want to build it yourself, here are key elements:
1. in the pc create a b4j server with this handle sub for the screen picture:
Public Sub Handle(req As ServletRequest, resp As ServletResponse)
robot.ScreenCurrentRectangleSetAsArbitrary(0,0,1280,720)
img = robot.ScreenCaptureAsByteArray
Dim su As StringUtils
resp.Write("<img width=1280 height=720 src='data:image/png;base64,")
resp.Write(su.EncodeBase64(img))
resp.Write("'/img>").write("</br>")
End Sub
2. in the device call the server specific handler and in the job_done sub do this:
Dim st As String = Job.GetString
Dim su As StringUtils
Dim barr() As Byte
barr = su.DecodeBase64(st)
Dim InputStream1 As InputStream
InputStream1.InitializeFromBytesArray(barr, 0, barr.Length)
Dim bmp As Bitmap
bmp.Initialize2(InputStream1)
iv.SetBackgroundImage(bmp)
iv.Visible = True
The screen image is displayed on the iv imageview.
Robot is an object from jAWTRobot library.