AT指令

不知道啊

Smartphone, Data modem both are using AT commands to communicate with host CPU in general. 前景 ... you should think what products are using AT cmd then.

还不错吧。可以学到很多底层协议方面的知识，有了这些知识。到哪都不怕了。

知道很多底层的知识啊

还以为有资料那