====== MQTT ======
  * Official site: [[http://mqtt.org|mqtt.org]]
  * [[http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html|MQTT V3.1.1协议规范]]

===== Tools =====
  * [[https://en.wikipedia.org/wiki/Comparison_of_MQTT_implementations| mqtt 实现库列表与比较]]
  * [[https://www.emqx.io/cn/|emqx]], 原名为 emqtt ，生产级开源 broker.
  * [[https://mosquitto.org/|Mosquitto ]], 轻量级服务端broker，适合本机测试用。
  * [[http://workswithweb.com/mqttbox.html|mqttbox]], mqtt客户端，可以保存发布内容，方便测试。