add Kconfig

Kconfig

@@ -0,0 +1,55 @@
+
+# AT device configuretion
+menuconfig PKG_USING_AT_DEVICE_TJ
+    bool "AT DEVICE: RT-Thread AT component porting or samples for different device"
+    default n
+    select RT_USING_AT
+    select AT_USING_CLIENT
+    select AT_USING_SOCKET
+
+if PKG_USING_AT_DEVICE_TJ
+
+    config PKG_AT_DEVICE_PATH
+        string
+        default "/packages/iot/at_device"
+
+    if PKG_AT_DEVICE_VER_NUM >= 0x20000
+
+        source "$PKGS_DIR/packages/iot/at_device/m26/Kconfig"
+        source "$PKGS_DIR/packages/iot/at_device/ec20/Kconfig"
+        source "$PKGS_DIR/packages/iot/at_device/esp8266/Kconfig"
+        source "$PKGS_DIR/packages/iot/at_device/rw007/Kconfig"
+        source "$PKGS_DIR/packages/iot/at_device/sim800c/Kconfig"
+        source "$PKGS_DIR/packages/iot/at_device/sim76xx/Kconfig"
+        source "$PKGS_DIR/packages/iot/at_device/mw31/Kconfig"
+
+    endif
+
+    if PKG_AT_DEVICE_VER_NUM < 0x20000
+
+        source "$PKGS_DIR/packages/iot/at_device/v1.x.x/Kconfig"
+
+    endif
+
+    choice
+
+        prompt "Version"
+        default PKG_USING_AT_DEVICE_LATEST_VERSION
+        help
+            Select the at_device version
+
+        config PKG_USING_AT_DEVICE_LATEST_VERSION
+            bool "latest"
+
+    endchoice
+
+    config PKG_AT_DEVICE_VER
+        string
+        default "latest"    if PKG_USING_AT_DEVICE_LATEST_VERSION
+    
+    config PKG_AT_DEVICE_VER_NUM
+        hex
+        default 0x99999    if PKG_USING_AT_DEVICE_LATEST_VERSION
+       
+endif
+