2012_sms_api

代码说明：

  SP与ISMG之间、ISMG之间进行信息交互时，可以采用长连接方式，也可以采用短连接方式。所谓长连接，指在一个TCP连接上可以连续发送多个数据包，在TCP连接保持期间，如果没有数据包发送，需要双方发链路检测包以维持此连接。短连接是指通信双方有数据交互时，就建立一个TCP连接，数据发送完成后，则断开此TCP连接，即每次TCP连接只完成一对CMPP消息的发送。(Information interaction between ISMG between SP and ISMG long connection can also be used to short connections. The so-called long connection, a TCP connection can be continuously send multiple packets, TCP connections remain during the If you do not send the packet, both sides need hair link test kits to maintain this connection. The short connecting both sides of communication data interaction, on the establishment of a TCP connection, the data transmission is complete, disconnect the TCP connection, and that each TCP connection completed only one pair of CMPP messages sent.)