Added bypass in basic WriteProperty handler to accept writes of NULL to non-commandable properties (#919)

ports/stm32f4xx/device.c

@@ -220,6 +220,46 @@ void Device_Objects_Property_List(BACNET_OBJECT_TYPE object_type,
     return;
 }
 
+/**
+ * @brief Determine if the object property is a member of this object instance
+ * @param object_type - object type of the object
+ * @param object_instance - object-instance number of the object
+ * @param object_property - object-property to be checked
+ * @return true if the property is a member of this object instance
+ */
+bool Device_Objects_Property_List_Member(
+    BACNET_OBJECT_TYPE object_type,
+    uint32_t object_instance,
+    BACNET_PROPERTY_ID object_property)
+{
+    bool found = false;
+    struct special_property_list_t property_list = { 0 };
+
+    Device_Objects_Property_List(object_type, object_instance, &property_list);
+    found = property_list_member(property_list.Required.pList, object_property);
+    if (!found) {
+        found =
+            property_list_member(property_list.Optional.pList, object_property);
+    }
+    if (!found) {
+        found = property_list_member(
+            property_list.Proprietary.pList, object_property);
+    }
+
+    return found;
+}
+
+/**
+ * @brief Returns the list of required, optional, and proprietary properties
+ *       for the Device object.
+ * @param pRequired [out] Pointer to the list of required properties
+ * @param pOptional [out] Pointer to the list of optional properties
+ * @param pProprietary [out] Pointer to the list of proprietary properties
+ * @note The lists are terminated with -1.
+ * @note The lists are not allocated, so do not free them.
+ * @note The lists are static, so do not modify them.
+ * @ingroup ObjIntf
+ */
 void Device_Property_Lists(
     const int **pRequired, const int **pOptional, const int **pProprietary)
 {