Annex C (normative) UADP Header Layouts ToC

C.2 Message headers for periodic data with fixed layout ToC Previous Next

C.2.4 Header layout for NetworkMessages ToC Previous Next

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

  • Version/Flags
  • ExtendedFlags1
  • PublisherId
  • GroupFlags
  • WriterGroupId
  • GroupVersion
  • NetworkMessageNumber
  • SequenceNumber Additional restrictions:

  • The datatype for the PublisherId shall be UInt16 The NetworkMessage header layout is shown in Figure C.1.


Figure C.1 : UADP NetworkMessage header layout

Table C.1 shows the configuration for the NetworkMessage header.

Table C.1 : 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 enabled
Bit 6: PayloadHeader disabled
Bit 7: ExtendedFlags1 enabled
ExtendedFlags1 Byte Bit range 0-2: PublisherId Type
   001 The PublisherId is of DataType UInt16
Bit 3: DataSetClassId disabled
Bit 4: Security disabled
Bit 5: Timestamp disabled
Bit 6: PicoSeconds disabled
Bit 7: ExtendedFlags2 disabled
PublisherId UInt16 Configured value for the PubSubConnection.
The datatype shall be UInt16
   GroupFlags Byte Bit 0: WriterGroupId enabled
Bit 1: GroupVersion enabled
Bit 2: NetworkMessageNumber enabled
Bit 3: SequenceNumber enabled
Bits 4-6: 0
Bit 7: disabled
   WriterGroupId UInt16 Configured value for the WriterGroup
   GroupVersion VersionTime Configured value for the WriterGroup
   NetworkMessageNumber UInt16 Configured value for the WriterGroup
   SequenceNumber UInt16 Defined by Table 74

Table C.2 defines the values for the configuration parameters representing this layout.

Table C.2 : Values for configuration parameters

Parameter Value
UadpNetworkMessageContentMask 0x0000003F

This value results of the following options:
Bit 0: PublisherId enabled
Bit 1: GroupHeader enabled
Bit 2: WriterGroupId enabled
Bit 3: GroupVersion enabled
Bit 4: NetworkMessageNumber enabled
Bit 5: SequenceNumber enabled

When a PubSubConnection is created by using the Method AddConnection() the element PublisherId contained in the argument PubSubConnectionDataType shall be of the datatype UInt16.

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