def handle_subscribe(client, data)
      topic = @engine.subscribe_client_to_topic client, data[0]

      trigger(:subscribe, client, topic.uri)
    end
def handle_subscribe(client, data)
      topic = @engine.subscribe_client_to_topic client, data[0]

      trigger(:subscribe, client, topic.uri)
    end
Handle a subscribe message from a client
 SUBSCRIBE data structure [TOPIC]