使用python描述电力通讯协议，包括从站和主站，基于兴趣，用于个人测试等。
工程算法(Engineering Algorithm) 主要介绍在工业工程,自动化控制领域内常用的工业工程算法. 比如:卡尔曼滤波器,扩展卡尔曼滤波器(EKF),无损卡尔曼滤波器(UKF)等
修改子rt-thread，使用RTT的scons编译方式，但不使用RTT.
MicroPython implementation on Ai-Thinker GPRS module A9 ( RDA8955 )
Ai-Thinker A9/A9G GPRS (with GPS(A9G)) module C development SDK
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