def METHOD_NAME(self, topic: str, message_handle_func):
    """Register aux message handling function with specified topics.
    Exception is raised when:
        a handler is already registered for the topic;
        bad topic - must be a non-empty string
        bad message_handle_func - must be callable
    Implementation Note:
        This method should simply call the ServerAuxRunner's register_aux_message_handler method.
    Args:
        topic: the topic to be handled by the func
        message_handle_func: the func to handle the message. Must follow aux_message_handle_func_signature.
    """
    pass