该代码使用php-serial项目进行串口通讯 相关的AT指令集:ATCPIN?\r:checksifSIMhasthepincode.ItanswersCPIN:READYorCPIN:SIMPINifweneedtoinsertthepinnumberATCMGS=”[number]”\r[text]Control-Z:tosendaSMS(inphpwehaveControl-Zwithchr(26)).ItreturnsOKorERRORATCMGF=1\r:setthedev