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In the IoT project architecture, besides the TCP-based MQTT protocol, the most commonly used is the UDP-based CoAP protocol. Both can be said to hold equal advantages.
The CoAP protocol runs on top of UDP, and the message format is very compact. A minimum data packet is only 4 bytes. Because it uses UDP, there is no need to maintain a connection, and the data packets are short, so it is widely used in projects using NB-IoT.
For the CoAP series of articles, I have planned for a long time but didn’t know where to start until I searched for CoAP on Bilibili and found the answers, haha~
The two videos by the uploader “Azheng Langle Geli Gelang” are exactly the answers I was looking for.
In practice, explaining the CoAP protocol and using WireShark for data capture analysis, I feel that reading text alone cannot clarify the CoAP protocol. It’s either a tedious protocol analysis or direct practice, and the two cannot be combined.
Therefore, I sincerely recommend these two videos at the beginning of the CoAP series tutorial. After understanding the CoAP protocol, I will explain how to use CoAPthon to write a CoAP testing client, how to set up your own private CoAP server, and conduct interface testing.
Finally, without further ado, here are the video links, haha, let’s learn~ I believe you will come back to like it after watching it 
① Detailed analysis and explanation of COAP protocol covering server setup and NB practical testing
https://www.bilibili.com/video/av73291271/
② Detailed explanation of COAP protocol (II) server testing and capture analysis
https://www.bilibili.com/video/av74345151
(The clarity of the mini program is not good, so I directly posted the link. You can also search for CoAP directly on Bilibili, and click the original text at the end to go directly!)
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