handle failed hello

Author: Lash-L

roborock/devices/local_channel.py

@@ -155,7 +155,12 @@ async def connect(self) -> None:
             raise RoborockConnectionException(f"Failed to connect to {self._host}:{_PORT}") from e
 
         # Perform protocol negotiation
-        await self._hello()
+        try:
+            await self._hello()
+        except Exception:
+            # If protocol negotiation fails, clean up the connection state
+            self.close()
+            raise
 
     def close(self) -> None:
         """Disconnect from the device."""