说明：  这是一本解说物联网的书。物联网整体服务的开发需要灵活应用传 感器和各类设备，本书就是为那些准备从事这种开发的硬件和软件工程 师编写的
(This is a book about the Internet of things. The development of the Internet of things services needs flexible application and transmission Sensors and devices, this book is for hardware and software engineering that is ready to do this development By the teacher)