Annex C (normative) UADP Header Layouts ToC

C.3 Message headers for Events and Data with dynamic layout ToC Previous

C.3.4 Header layout for NetworkMessages ToC Previous Next

A UADP NetworkMessage header shall consist of the following fields according to this header layout:

  • Version/Flags
  • ExtendedFlags1
  • PublisherId
  • PayloadHeader Additional restrictions:

  • The datatype for the PublisherId shall be UInt64 Note: For the PublisherId the DataType UInt64 was selected because it allows a simple way for a Publisher to generate unique PublisherIds by using the local MAC address (48 Bit) as part of the PublisherId.

The NetworkMessage header layout is shown in Figure C.7.


Figure C.7 : UADP NetworkMessage header layout

Table C.7 shows the configuration for the NetworkMessage header.

Table C.7 : UADP NetworkMessage header layout

Name Type Restrictions
UADPVersion Bit[0-3] The version shall be 1
UADPFlags Bit[4-7] Bit 4: PublisherId enabled
Bit 5: GroupHeader disabled
Bit 6: PayloadHeader enabled
Bit 7: ExtendedFlags1 enabled
ExtendedFlags1 Byte Bit range 0-2: PublisherId Type
   011 The PublisherId is of DataType UInt64
Bit 3: DataSetClassId disabled
Bit 4: Security disabled
Bit 5: Timestamp disabled
Bit 6: PicoSeconds disabled
Bit 7: ExtendedFlags2 disabled
PublisherId UInt64 Configured value for the PubSubConnection.
The datatype shall be UInt64.
PayloadHeader Byte[*] Defined by Table 80

Table C.8 defines the values for the configuration parameters representing this layout.

Table C.8 : Values for configuration parameters

Parameter Value
UadpNetworkMessageContentMask 0x00000041

This value results of the following options:
Bit 0: PublisherId enabled
Bit 6: PayloadHeader enabled

When a PubSubConnection is created by using the Method AddConnection() the element PublisherId contained in the argument PubSubConnectionDataType shall be of the DataType UInt64.

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