A UADP NetworkMessage header shall consist of the following fields according to this header layout:
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 A.7.
Figure A.7 – UADP NetworkMessage header layout
Table A.7 shows the configuration for the NetworkMessage header.
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: 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 159. |
Table A.8 defines 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: 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.