wssserver tool should accept port parameter

Default doesn't agree with `WebsocketClient` sample, should be 8000

Sming/Components/Network/component.mk

@@ -98,7 +98,7 @@ endif
 
 # Websocket Server
 CACHE_VARS			+= WSSERVER_PORT
-WSSERVER_PORT		?= 9999
+WSSERVER_PORT		?= 8000
 .PHONY: wsserver
 wsserver: ##Launch a simple python Websocket echo server for testing client applications
 	$(info Starting Websocket server for TESTING)

Sming/Components/Network/tools/wsserver.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import argparse
 import asyncio
 from websockets.server import serve
 import logging
@@ -8,13 +9,16 @@ async def echo(websocket):
     async for message in websocket:
         await websocket.send(message)
 
-async def main():
+async def main(port: int):
     logging.basicConfig(
         format="%(asctime)s %(message)s",
         level=logging.DEBUG,
     )
-    async with serve(echo, None, 8000):
+    async with serve(ws_handler=echo, port=port):
         await asyncio.Future()  # run forever
 
 if __name__ == "__main__":
-    asyncio.run(main())
+    parser = argparse.ArgumentParser(description='Simple websocket server')
+    parser.add_argument('port', help='Port number (default 8000)', type=int, default=8000)
+    args = parser.parse_args()
+    asyncio.run(main(args.port))