Fix setting MQTT socket buffer size with WebsocketWrapper (#117672)

homeassistant/components/mqtt/client.py

@@ -540,6 +540,14 @@ class MQTT:
 
     def _increase_socket_buffer_size(self, sock: SocketType) -> None:
         """Increase the socket buffer size."""
+        if not hasattr(sock, "setsockopt") and hasattr(sock, "_socket"):
+            # The WebsocketWrapper does not wrap setsockopt
+            # so we need to get the underlying socket
+            # Remove this once
+            # https://github.com/eclipse/paho.mqtt.python/pull/843
+            # is available.
+            sock = sock._socket  # noqa: SLF001
+
         new_buffer_size = PREFERRED_BUFFER_SIZE
         while True:
             try: