The UADP NetworkMessage header and other parts of the NetworkMessage are shown in Figure 29.
When using security, the payload and the Padding field are encrypted and after that, the whole NetworkMessage is signed if signing and encryption is active. The NetworkMessage shall be signed without being encrypted if only the signing is active.
The UADP NetworkMessage does not provide the total message size. It is expected that the message size is known from the transport protocol mapping. If the transport protocol mapping does not provide the size of the payload, an additional size information must be added in front of the UADP NetworkMessage for that transport protocol.
