About LoRaWAN, see: https://lora-alliance.org/about-lorawan
LoRaWAN™ network protocol, see: https://lora-alliance.org/sites/default/files/2018-04/lorawantm_specification_-v1.1.pdf
LoRaWAN™ 网络协议(规范) 中文翻译版，见： https://blog.csdn.net/qingchuwudi/article/details/50786289
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