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https://www.zhihu.com/question/20242554
workerman通信demo http://file-post.net/zc/fp9/d1/1511715391_226666410_24/?id=BiFD4AOX4Ooi
售货机 https://files.cnblogs.com/files/wordblog/%E5%94%AE%E5%90%8E%E6%9C%BA%E6%95%B0%E6%8D%AE%E5%AD%97%E5%85%B8.rar
https://www.zhihu.com/question/20242554