def handle_unsubscribe(client, data)
      topic = @engine.unsubscribe_client_from_topic(client, data[0])

      trigger(:unsubscribe, client, topic.uri)
    end
def handle_unsubscribe(client, data)
      topic = @engine.unsubscribe_client_from_topic(client, data[0])

      trigger(:unsubscribe, client, topic.uri)
    end
Handle an unsubscribe message from client
 UNSUBSCRIBE data structure [TOPIC]