adding BACnet application and context-specfic data parsing for WriteProperty.

bacnet-stack/wp.h

@@ -41,13 +41,15 @@
 
 /* write property can have application tagged data, or context tagged data,
    or even complex data types (i.e. opening and closing tag around data).
-   It could also have more than one value.  */
+   It could also have more than one value or element.  */
+
 typedef struct BACnet_Write_Property_Data {
     BACNET_OBJECT_TYPE object_type;
     uint32_t object_instance;
     BACNET_PROPERTY_ID object_property;
     int32_t array_index;        /* use BACNET_ARRAY_ALL when not setting */
-    BACNET_APPLICATION_DATA_VALUE value;
+    uint8_t *application_data;
+    int application_data_len;
     uint8_t priority;           /* use BACNET_NO_PRIORITY if no priority */
 } BACNET_WRITE_PROPERTY_DATA;