Errata exists for this version of the document.

The QueueName parameter with DataType String specifies the queue in the Broker that receives NetworkMessages sent by the Publisher. This could be the name of a queue or topic defined in the Broker.

The ResourceUri property of DataType String allows the transport implementation to look up the configured key from the corresponding KeyCredentialConfigurationType instance defined in OPC 10000-12 to use for authenticating access to the specified queue.

If this String is not null, it overrides the ResourceUri of the PubSubConnection authentication settings.

The parameter AuthenticationProfileUri of DataType String allows the selection of the authentication protocol used by the transport implementation for authenticating access to the specified queue.

If this String is not null, it overrides the AuthenticationProfileUri of the PubSubConnection transport settings defined in 6.4.2.1.2.

The RequestedDeliveryGuarantee parameter with DataType BrokerTransportQualityOfService specifies the delivery guarantees that shall apply to all NetworkMessages published by the WriterGroup unless otherwise specified on the DataSetWriter transport settings. The DataType BrokerTransportQualityOfService is defined in 6.4.2.2.5.

The value NotSpecified_0 is not allowed on the WriterGroup. If the selected delivery guarantee cannot be applied, the WriterGroup shall set the state to Error_3.

The BrokerTransportQualityOfService Enumeration DataType is formally defined in Table 71.

The mapping of quality of service to the broker transport specific implementation is defined in 7.3.4.5 for AMQP and 7.3.5.5 for MQTT.

Table 69 – BrokerTransportQualityOfService Values

Value	Description
NotSpecified_0	The value is not specified and the value of the parent object shall be used.
BestEffort_1	The transport shall make the best effort to deliver a message. Worst case this means data loss or data duplication are possible.
AtLeastOnce_2	The transport guarantees that the message shall be delivered at least once, but duplication is possible. Readers must de-duplicate based on message id or sequence number.
AtMostOnce_3	The transport guarantees that the message shall be sent once, but if it is lost it is not sent again.
ExactlyOnce_4	The transport handshake guarantees that the message shall be delivered to the broker exactly once and not more or less.

This Structure DataType is used to represent the Broker specific transport mapping parameters for WriterGroups. It is a subtype of the WriterGroupTransportDataType defined in 6.2.5.6.2.

The BrokerWriterGroupTransportDataType is formally defined in Table 70.

Table 70 – BrokerWriterGroupTransportDataType Structure

Name	Type	Description
BrokerWriterGroupTransportDataType	Structure
queueName	String	Defined in 6.4.2.2.1.
resourceUri	String	Defined in 6.4.2.2.2.
authenticationProfileUri	String	Defined in 6.4.2.2.3.
requestedDeliveryGuarantee	BrokerTransportQualityOfService	Defined in 6.4.2.2.4.