In order to run this demo the user may do as follows:
1. Start Cisco Packet Tracer and load a sample file: real-websocket.pkt
2. Click on the device named WebSockets HTTP Server.
3. In the dialog that opens navigate to programming tab and
start one of the server applications. In order for this
to work correctly one may need to enable an option
[✔] Enable External Network Access from Device Scripts
in Options/Preferences dialog, Miscellaneous tab.
4. Refesh this page in the browser. The outpus one would see will
resemple echo-server behavior.