进行底层开发是一件有趣而兴奋的事情，因为，你必须做很多事情。
Low level programming is a fun and exciting task, because you have to do everything.
在开发期间，即使应用程序没有变化，底层库也可能改变。
During development, even when an application does not change, the underlying libraries can change.
文中给出的各硬件模块底层驱动代码是在CCS 2.0开发软件下编译的。
The code given in the paper is compiled in the development software of CCS 2.0.
开发upnp时的底层库，可以运行，主要是实现了upnp的底层协议！
UPnP development at the bottom, you can run, is the bottom of the UPnP agreement!
开发upnp时的底层库，可以运行，主要是实现了upnp的底层协议！
UPnP development at the bottom, you can run, is the bottom of the UPnP agreement!
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