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 or UInt64
The NetworkMessage header layout is shown in Figure A.1.
Figure A.1 – UADP NetworkMessage header layout
Table A.1 shows the configuration for the NetworkMessage header.
Table A.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 = 1 Bit 5: GroupHeader enabled = 1 Bit 6: PayloadHeader enabled = 0 Bit 7: ExtendedFlags1 enabled = 1 |
|
ExtendedFlags1 |
Byte |
Bit range 0-2: PublisherId Type with one of the two following options 001 The PublisherId is of DataType UInt16 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 |
UInt16 or UInt64 |
Configured value for the PubSubConnection. The datatype shall be UInt16 or UInt64. |
|
GroupHeader |
|
|
|
GroupFlags |
Byte |
Bit 0: WriterGroupId enabled = 1 Bit 1: GroupVersion enabled = 1 Bit 2: NetworkMessageNumber enabled = 1 Bit 3: SequenceNumber enabled = 1 Bits 4-6: 0 Bit 7: 0 |
|
WriterGroupId |
UInt16 |
Configured value for the WriterGroup. |
|
GroupVersion |
VersionTime |
Configured value for the WriterGroup. |
|
NetworkMessage Number |
UInt16 |
Configured value for the WriterGroup. |
|
SequenceNumber |
UInt16 |
Defined by Table 137. |
Table A.2 defines the values for the configuration parameters representing this layout.
Table A.2 – Values for configuration parameters
|
Parameter |
Value |
|
UadpNetworkMessageContentMask |
0x0000003F
This value results of the following options: Bit 0: PublisherId enabled = 1 Bit 1: GroupHeader enabled = 1 Bit 2: WriterGroupId enabled = 1 Bit 3: GroupVersion enabled = 1 Bit 4: NetworkMessageNumber enabled = 1 Bit 5: SequenceNumber 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 UInt16 or UInt64.