改函数包包装了GPRS通信的接口，使得开发者不必通过AT命令集去实现通信。只需调用函数接口即可。大大简化GPRS网络编程-change function packets GPRS communications interface that allows developers without going through the AT command set to communicate. Only the function call interface can be. Greatly simpli

AT命令集，适用于进行GPRS通信以及DTMF远程控制应用。-AT Command