docs: def on_open(self, ws):
          """
          Callback executed when a connection is opened to the server.
          Handles streaming of audio to the server.
  
          :param ws: Websocket client
          """
          self.callback.on_connected()
  
          # Send initialization message
          init_data = self.build_start_message(self.options)
          self.ws_client.send(json.dumps(init_data).encode('utf8'), websocket.ABNF.OPCODE_TEXT)