说明：  //直接按照内容执行AT指令:CEN666666#57:AT+CREG? //参数:paraptr=命令代码以后的参数的地址 //返回值:成功1,失败0,同时产生serialmsg消息 //函数说明： //正确时回复短信:执行后AT指令返回的内容 //错误时回复短信:密码错误或命令错误或参数错误
(//Directly in accordance with the contents of the implementation of AT commands: CEN666666# 57: AT+ CREG?// Parameters: paraptr = command code after the address of the parameters// return values: successful one, the failure of 0, at the same time generate serialmsg news// Function Description:// correct reply message: AT command to return to after the implementation of the contents of// error message back: password error or command error or parameter error)