MD231 可编程gprs/gsm模块比较全面参考程序:包括(7bit/8bit/16进制)短消息收发，gprs tcp/udp数据传输框架,nvram存储参数读写,通过AT通道获取来电号码,小区cellid等.-MD231 programmable gprs/gsm module is more comprehensive reference program include: (7bit/8bit/16 hex) short messaging, gprs tcp/udp data fr a