A UADP NetworkMessageheader shall consist of the following fields according to this header layout:
Additional restrictions:
- The datatype for the PublisherIdshall be UInt64
Note:For the PublisherIdthe DataType UInt64was selected because it allows a simple way for a Publisherto generate unique PublisherIdsby using the local MAC address (48 Bit) as part of the PublisherId.
The NetworkMessageheader layout is shown in Figure A.7.
Figure A.7– UADP NetworkMessage header layout
Table A.7shows the configuration for the NetworkMessageheader.
Table A.7– UADP NetworkMessage header layout
|
Name |
Type |
Restrictions |
|
UADPVersion |
Bit[0-3] |
The version shall be 1 |
|
UADPFlags |
Bit[4-7] |
Bit 4: PublisherIdenabled = 1 Bit 5: GroupHeaderenabled = 0 Bit 6: PayloadHeaderenabled = 1 Bit 7: ExtendedFlags1 enabled = 1 |
|
ExtendedFlags1 |
Byte |
Bit range 0-2: PublisherIdType 011 The PublisherIdis of DataType UInt64 Bit 3: DataSetClassIdenabled = 0 Bit 4: SecurityHeaderenabled = 0 Bit 5: Timestampenabled = 0 Bit 6: PicoSecondsenabled = 0 Bit 7: ExtendedFlags2 enabled = 0 |
|
PublisherId |
UInt64 |
Configured value for the PubSubConnection. The datatype shall be UInt64. |
|
PayloadHeader |
Byte[*] |
Defined by Table 140. |
Table A.8defines the values for the configuration parameters representing this layout.
Table A.8– Values for configuration parameters
|
Parameter |
Value |
|
UadpNetworkMessageContentMask |
0x00000041
This value results of the following options: Bit 0: PublisherIdenabled = 1 Bit 6: PayloadHeader enabled = 1 |
When a PubSubConnectionis created by using the Method AddConnection()the element PublisherIdcontained in the argument PubSubConnectionDataType shall be of the DataType UInt64.