A UADP body is encoded as defined for the UADP message mapping defined in 7.2.2.
It is expected that the software used to receive UADP NetworkMessage can process the body without needing to know how it was transported.
When sending such message over MQTT Version 5.0 the ContentType property shall be set to application/opcua+uadp.
It is recommended that the MetaDataQueueName as described in 220.127.116.11.5 is configured as a sub-topic of the related QueueName with the name “$Metadata”. The MQTT RETAIN flag shall be set for metadata messages.