The Action specific use of PubSub configuration parameters is defined in Table 84.
Note that the reliability of the protocol depends on the QoS levels supported by the protocol. Any Broker-based middleware that is using a QoS of AtLeastOnce or greater is reliable (see 6.4.2.5.4). Broker-less middle is not reliable if it does not support any DatagramQoS (see 6.4.1.2.6).
Table 84 – Action specific use of parameters
|
PubSubComponent |
Parameter |
Description |
|
PubSubConnectionDataType |
ReaderGroups |
Readers are not used for Actions. |
|
|
||
|
WriterGroupDataType |
PublishingInterval |
The value is 0 for reliable transport protocols. The value shall be larger than 0 for non-reliable transport protocols. The Requestor and Responder resends Action messages that have not been acknowledged by the receiver with this frequency. |
|
|
KeepAliveTime |
This value is not used and set to 0. |
|
|
HeaderLayoutUri |
For JSON messages the JSON-NetworkMessage header layout URI is used (see A.3.4). For UADP messages this value is UADP-Dynamic header layout URI is used (see A.2.2). |
|
|
||
|
BrokerWriterGroupTransportDataType |
QueueName |
The address that the Requestor uses to send requests to the Responder. |
|
|
RequestedDeliveryGuarantee |
Shall be AtLeastOnce or better |
|
|
||
|
UadpWriterGroupMessageDataType |
SamplingOffset |
Always -1. |
|
|
NetworkMessageContentMask |
Bit 0: PublisherId is always 1 |
|
|
||
|
JsonWriterGroupMessageDataType |
NetworkMessageContentMask |
Bit 0: NetworkMessageHeader is always 1. Bit 1: DataSetMessageHeader is always 1. Bit 2: SingleDataSetMessage is always 0. Bit 3: PublisherId is always 1 Bit 5: ReplyTo is is always 0. |
|
|
||
|
DataSetWriterDataType |
DataSetFieldContentMask |
Always 0. |
|
|
KeyFrameCount |
Always 0. |
|
|
DataSetName |
The name of the ActionMetaData. |
|
|
||
|
UadpDataSetWriterMessageDataType |
DataSetMessageContentMask |
Bit 1: PicoSeconds is always 0. Bit 2: Status is always 1, however, it is not sent in requests. |
|
|
||
|
JsonDataSetWriterMessageDataType |
DataSetMessageContentMask |
Bit 2: SequenceNumber is always 0. Bit 4: Status is always 1, however, it is not sent in requests. Bit 5: MessageType is always 0. Bit 8: PublisherId is always 0 |
|
|
||
|
DatagramWriterGroupTransport2DataType |
MessageRepeatCount |
Always 0 |
|
|
MessageRepeatDelay |
Always 0 |
|
|
||
|
BrokerDataSetWriterTransportDataType |
QueueName |
Not used. |
|
|
RequestedDeliveryGuarantee |
Not used. |
|
|
MetaDataQueueName |
The address used to send ActionMetaData Messages. |