添加rtthread相关代码

riscv/rtthread/components/net/at/Kconfig

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+menuconfig RT_USING_AT
+    bool "Enable AT commands"
+    default n
+
+if RT_USING_AT
+
+    config AT_DEBUG
+        bool "Enable debug log output"
+        default n
+
+    config AT_USING_SERVER
+        bool "Enable AT commands server"
+        default n
+
+    if AT_USING_SERVER
+
+        config AT_SERVER_DEVICE
+            string "Server device name"
+            default "uart3"
+
+        config AT_SERVER_RECV_BUFF_LEN
+            int "The maximum length of server data accepted"
+            default 256
+
+        config AT_SERVER_SEND_BUFF_LEN
+            int "The maximum length of server commands buffer"
+            default 256
+
+    endif
+
+    config AT_USING_CLIENT
+        bool "Enable AT commands client"
+        default n
+
+    if AT_USING_CLIENT
+
+        config AT_CLIENT_NUM_MAX
+            int "The maximum number of supported clients"
+            default 1
+            range 1 65535
+
+        config AT_USING_SOCKET
+            bool "Enable BSD Socket API support by AT commnads"
+            select RT_USING_SAL
+            select SAL_USING_AT
+            default n
+
+        if AT_USING_SOCKET
+
+            config AT_USING_SOCKET_SERVER
+                bool "Enable BSD Socket API support about AT server"
+                default n
+
+        endif
+
+    endif
+
+    if AT_USING_SERVER || AT_USING_CLIENT
+
+        config AT_USING_CLI
+            bool "Enable CLI(Command-Line Interface) for AT commands"
+            default y
+            depends on RT_USING_FINSH
+
+       config AT_PRINT_RAW_CMD
+            bool "Enable print RAW format AT command communication data"
+            default n
+
+    endif
+
+    config AT_SW_VERSION_NUM
+        hex
+        default 0x10301
+        help
+            software module version number
+
+endif