Added NULL response

README.md

@@ -18,11 +18,12 @@ You can send raw text to the WS server. This text is in form of commands:
 - `MSG {token} {message}` will set the message and broadcast it to all logged-in clients;
 - `CLEAR {token}` will clear the current message.
 
-You may receive one of two packets while using the server:
+You may receive one of three responses while using the server:
 
 - `MSG {message}` to indicate there's a new message. The client should react by showing an alert with the message. If no message is present, the packet will be `MSG` only. In this case, the client shouldn't react.
 - `OK` indicates the action was successful. The client should react by showing an alert telling the user so.
+- `NULL` to indicate that no data is available. No client reaction is intended.
 
 ## Frontend
 
-The frontend is a static HTML page and can be hosted on anything.
+The frontend is a static HTML page and can be hosted on anything.

main.py

@@ -18,6 +18,9 @@ async def handle(websocket):
         CONNECTIONS.add(websocket)
     async for message in websocket:
         if message == "GET":
+            if EAS_MESSAGE == "":
+                await websocket.send("NULL")
+                return
             await websocket.send(f"MSG {EAS_MESSAGE}")
         if message.startswith(f"MSG {TOKEN} "):
             # broadcast from vee