The BACnetUaMapper should have a configuration option for the default priority used when a BACnet property is written through the OPC UA server. The default value for this configuration option should be the BACnet priority 8 which is “Manual Operator”.

If the BACnetUaMapper wants to support writing with other priorities it should support the WriteProperty Method on the BACnetDeviceType Object. It is strongly recommended that this method requires user authentication.