Secured SubscribeCOVProperty decoder. (#892)

* Secured SubscribeCOVProperty decoder.

* Changed datatype of monitoredProperty in struct BACnet_Subscribe_COV_Data

src/bacnet/bacdevobjpropref.c

@@ -919,6 +919,21 @@ bool bacnet_property_reference_same(
     return status;
 }
 
+/**
+ * @brief Copy the complex data of src to dest
+ * @param dest - destination structure
+ * @param src - source structure
+ */
+void bacnet_property_reference_copy(
+    struct BACnetPropertyReference *dest,
+    const struct BACnetPropertyReference *src)
+{
+    if (dest && src) {
+        dest->property_identifier = src->property_identifier;
+        dest->property_array_index = src->property_array_index;
+    }
+}
+
 /**
  * @brief Decode a BACnetPropertyReference from a buffer
  * @param apdu - the APDU buffer