5.7.3 Acknowledge Method

The Acknowledge Method is used to acknowledge an Event Notification for a Condition instance state where AckedState is False. Normally, the NodeId of the object instance is passed as the ObjectId to the Call Service. However, some Servers do not expose Condition instances in the AddressSpace. Therefore, Servers shall allow Clients to call the Acknowledge Method by specifying ConditionId as the ObjectId. The Method cannot be called with an ObjectId of the AcknowledgeableConditionType Node.

Signature

	Acknowledge(
		[in] ByteString EventId
		[in] LocalizedText Comment
		);

The parameters are defined in Table 34

Method result codes in Table 35 (defined in Call Service)

Comments

A Server is responsible to ensure that each Event has a unique EventId. This allows Clients to identify and acknowledge a particular Event Notification.

The EventId identifies a specific Event Notification with an acknowledgeable state was reported. Acknowledgement and the optional comment will be applied to the state identified with the EventId. If the comment field is NULL (both locale and text are empty) it will be ignored and any existing comments will remain unchanged. To reset the comment, an empty text with a locale shall be provided.

A valid EventId will result in an Event Notification where AckedState/Id is set to True and the Comment Property contains the text of the optional comment argument. If a previous state is acknowledged, the BranchId and all Condition values of this branch will be reported. Table 36 specifies the AddressSpace representation for the Acknowledge Method.

If Auditing is supported, this Method shall generate an Event of AuditConditionAcknowledgeEventType for all invocations of the Method.