feat: add support for external object table in device management

Signed-off-by: Tony <tonylu@tony-cloud.com>

src/bacnet/basic/object/device.c

@@ -84,6 +84,31 @@ Routed_Device_Write_Property_Local(BACNET_WRITE_PROPERTY_DATA *wp_data);
 /* may be overridden by outside table */
 static object_functions_t *Object_Table;
 
+#if defined(BACNET_GATEWAY_EXTERNAL_OBJECT_TABLE)
+static object_functions_t My_Object_Table[] = {
+        { MAX_BACNET_OBJECT_TYPE,
+            NULL /* Init */,
+            NULL /* Count */,
+            NULL /* Index_To_Instance */,
+            NULL /* Valid_Instance */,
+            NULL /* Object_Name */,
+            NULL /* Read_Property */,
+            NULL /* Write_Property */,
+            NULL /* Property_Lists */,
+            NULL /* ReadRangeInfo */,
+            NULL /* Iterator */,
+            NULL /* Value_Lists */,
+            NULL /* COV */,
+            NULL /* COV Clear */,
+            NULL /* Intrinsic Reporting */,
+            NULL /* Add_List_Element */,
+            NULL /* Remove_List_Element */,
+            NULL /* Create */,
+            NULL /* Delete */,
+            NULL /* Timer */,
+            NULL /* Writable_Property_List */ }
+};
+#else
 static object_functions_t My_Object_Table[] = {
     { OBJECT_DEVICE,
       NULL /* Init - don't init Device or it will recourse! */,
@@ -1047,6 +1072,7 @@ static object_functions_t My_Object_Table[] = {
       NULL /* Timer */,
       NULL /* Writable_Property_List */ }
 };
+#endif
 
 /* Proprietary property callback functions to enable proprietary
    properties while reusing the basic objects as-is. */
@@ -4272,14 +4298,16 @@ void Device_Init(object_functions_t *object_table)
         }
         pObject++;
     }
-#if (BACNET_PROTOCOL_REVISION >= 14)
+#if (BACNET_PROTOCOL_REVISION >= 14) && !defined(BACNET_GATEWAY_EXTERNAL_OBJECT_TABLE)
     /* link WriteProperty to Channel object for members */
     Channel_Write_Property_Internal_Callback_Set(Device_Write_Property);
 #endif
+#if !defined(BACNET_GATEWAY_EXTERNAL_OBJECT_TABLE)
     /* link ReadProperty and WriteProperty to Loop object for references */
     Loop_Read_Property_Internal_Callback_Set(Device_Read_Property);
     Loop_Write_Property_Internal_Callback_Set(Device_Write_Property);
-#if (BACNET_PROTOCOL_REVISION >= 17)
+#endif
+#if (BACNET_PROTOCOL_REVISION >= 17) && !defined(BACNET_GATEWAY_EXTERNAL_OBJECT_TABLE)
     /* link WriteProperty to Timer object for references */
     Timer_Write_Property_Internal_Callback_Set(Device_Write_Property);
 #endif