说明：  自己编写的ralink平台用来检测DHCPclient设备是否存在，主要是通过arping的返回状态来判断，然后吧状态写入文件，goahead需要读取文件，输出到页面就OK，直接编写即可通过，私人源码不可商业用途
(Their written the ralink platform used to detect DHCPclient device exists, arping return status to determine, and then writes the state file goahead to the need to read the file, output to the page OK, direct writing can be enacted)