CoAP
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RFC 7252 The Constrained Application Protocol (CoAP)

CoAP 是受限环境下的client->server文本消息协议，使用UDP传输，协议交互类似于简化版的HTTP。

传输层加密可用DTLS。

参考资料
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- `The Constrained Application Protocol (CoAP) <https://tools.ietf.org/html/rfc7252>`_
- `MQTT and CoAP, IoT Protocols <https://eclipse.org/community/eclipse_newsletter/2014/february/article2.php>`_
- `Constrained Application Protocol for Internet of Things <https://www.cse.wustl.edu/~jain/cse574-14/ftp/coap/index.html>`_
- `What is CoAP IoT protocol | CoAP Architecture,message header <https://www.rfwireless-world.com/IoT/CoAP-protocol.html>`_
- `CoAP <http://coap.technology/>`_