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        :param opaque: data to associate with the async call

        :param callable callback: callback when call is done, signature is the

            same as for :method:`async_call_cb` of :class:`RpcConnection`

            same as for :py:meth:`RpcConnection.async_call_cb`

        :param remote_name: remote method name

        :param \*args: arguments for the call

        :param \*\*kwargs: keyword arguments for the call