@classmethod
def to_write_ack_topic(cls, requests_topic):
    """Takes a Property requests topic and returns the related write ACK topic."""
    topic_split = requests_topic.split('/')
    servient_id, thing_name, prop_name = topic_split[-5], topic_split[-2
        ], topic_split[-1]
    return '{}/property/ack/{}/{}'.format(servient_id, thing_name, prop_name)
