一个gprs通讯的数个 at命令封装，需要串口支持，没有实现所有的at命令，实现了几个关键的命令，比如：拨 接 电话，tcp连接等。可以增加函数。-a GPRS communications at the several orders Packaging need serial, not at all in order to achieve several key orders, such as : dial telephone, tcp connections. Increase functi