SIM7020C NB-IoT MQTT通讯 树莓派4B

主处理器：树莓派4B 服务器：阿里云轻量级服务器 MQTT代理服务器： apollo 具体搭建连接:https://blog.csdn.net/ddxxii/article/details/80890293?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522158757431019725211921004%2522%252C%2522s

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