GPRS DTU 主要用于监听特定端口的TCP端口的连接，并确定连接的有效性。-GPRS dtu listens mainly used for listening on a specific port tcp port connection and determine the validity of the connection.

远程通讯，TCP远程数据传输，数据采集，基于GPRS模块(Remote communication, TCP remote data transmission and data acquisition are based on GPRS module)