AT命令如何控制STK进入子菜单？

已知步骤：
1、at+stsf=1激活
2、at+stgi=0进入主菜单
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at+stgi=0
+STGI: "80795E5DDE884C59295730FFFF"
+STGI: 1,17,"80767B5F556CE89500FFFF",0
+STGI: 2,17,"8000530049004D84254E1A5385FFFF",0
+STGI: 3,17,"808F7B677E5F6994C3FFFF",0
+STGI: 4,17,"8065E07EBF97F34E504FF14E5090E8FFFF",0
+STGI: 5,17,"8065B095FB59296C14FFFF",0
+STGI: 6,17,"8094C358F056FE7247FFFF",0
+STGI: 7,17,"8098DE4FE14EA453CBFFFF",0
+STGI: 8,17,"805F005FC34F1195F2FFFF",0
+STGI: 9,17,"80751F6D3B5E388BC6FFFF",0
+STGI: 10,17,"807A7A4E2D5F006237FFFF",0
+STGI: 11,17,"8067E58BE2FFFF",0
+STGI: 12,17,"807A7A4E2D5145503CFFFF",0
+STGI: 13,17,"8000530049004D84254E1A5385FFFF",0
+STGI: 14,17,"80519C4FE1901AFFFF",0
+STGI: 17,17,"805E9475287BA17406FFFF",0
+STGI: 18,17,"804E0B8F7D8BBE7F6EFFFF",0
+STGI: 19,17,"8000530049004D53614FE1606FFFFF",0

OK

at+stgr=0,12,1 //想进入第12个子菜单项，失败。

+CME ERROR: 3

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问题一、不知道怎么才能进入子菜单？是什么样的命令格式？
问题二、当需要返回上一级、确认、取消等操作应该如何实现？

最好能有相关实例，请高手们指教，这是小弟的第一份说得过去的工作，大家帮帮忙。 --------------------编程问答-------------------- at+stgr=0,1,12 --------------------编程问答-------------------- AT+STGR

作用: 该命令让用户在主菜单中选择一项,或回应下面的消息 1. GET INKEY 2. GET INPUT 3. SELECT ITEM 4. SETUP CALL 5. DISPLAY TEXT 用户也可以用如下参数来终止,回退STK等动作 1. BACKWARD MOVE 2. NO RESPONSE 3. END SESSION 退到上一级用户无响应用户终止

设置命令: AT+STGR=[,,] 当CmdType=2 (Get Inkey ) 或CmdType=3 (Get Input ) 且需输入字符串时,用户须输入 AT+STGR=[,]回车,系统返回>,用户输入字符串,然后用Ctrl+Z确认, 用Esc放弃. 返回: OK/ERROR 测试命令:AT+STGR= 返回:+ STGR: (0,1,2,3,4,6,11,95,96,97,98,99),(0-2) ," " 0:用户在主菜单中选择一项 1:回应Disp Text. 2:回应Get Inkey.
--------------------编程问答-------------------- 这里面说的：
｛
用户也可以用如下参数来终止,回退STK等动作 1. BACKWARD MOVE 2. NO RESPONSE 3. END SESSION 退到上一级用户无响应用户终止
｝
我还是没找到方法通后退和返回主菜单，当在子菜单时，可以使用at_stgr=99来返回主菜单 --------------------编程问答-------------------- 选择STK菜单，你应该发SelectItem命令 --------------------编程问答-------------------- 怎么解决！分享下！谢谢啊！

补充：移动开发 ,  移动开发其他问题