The selected IP camera identifies the loadcam() method
with the URL parameter. The web server is a component
of IP camera. To receive images, a message is sent to the
selected IP camera server. The return value is only one
image. After IP camera selecting the camera_thread() is starting. This thread calls the loadcam() method, after
which the time sleep is set up and the thread starts again.
In this way we succession of images which can be viewed
on the screen.