Gets a single data link.

        :param str instance: A Yamcs instance name.
        :param str link: The name of the data link.
        :rtype: .Link

def get_data_link(self, instance, link):
        """
        Gets a single data link.

        :param str instance: A Yamcs instance name.
        :param str link: The name of the data link.
        :rtype: .Link
        """
        response = self.get_proto('/links/{}/{}'.format(instance, link))
        message = yamcsManagement_pb2.LinkInfo()
        message.ParseFromString(response.content)
        return Link(message)