A.2.2.4 Header layout for NetworkMessages
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
The NetworkMessage header layout is shown in Figure A.7.
Table A.7 shows the configuration for the NetworkMessage header.
| Name | Type | Restrictions |
| UADPVersion | Bit[0-3] | The version shall be 1 |
| UADPFlags | Bit[4-7] | Bit 4: PublisherId enabled = 1 Bit 5: GroupHeader enabled = 0 Bit 6: PayloadHeader enabled = 1 Bit 7: ExtendedFlags1 enabled = 1 |
| ExtendedFlags1 | Byte | Bit range 0-2: PublisherId Type 011 The PublisherId is of DataType UInt64 Bit 3: DataSetClassId enabled = 0 Bit 4: SecurityHeader enabled = 0 Bit 5: Timestamp enabled = 0 Bit 6: PicoSeconds enabled = 0 Bit 7: ExtendedFlags2 enabled = 0 |
| PublisherId | UInt64 | Configured value for the PubSubConnection. The datatype shall be UInt64. |
| PayloadHeader | Byte[*] | Defined by Table 160. |
Table A.8 defines the values for the configuration parameters representing this layout.
| Parameter | Value |
| UadpNetworkMessageContentMask | 0x00000041 This value results of the following options: Bit 0: PublisherId enabled = 1 Bit 6: PayloadHeader enabled = 1 |
When a PubSubConnection is created by using the Method AddConnection() the element PublisherId contained in the argument PubSubConnectionDataType shall be of the DataType UInt64.