Name

Type

Description

Request

requestHeader

RequestHeader

Common request parameters (see 7.28 for RequestHeader definition).

subscriptionId

IntegerId

The Server-assigned identifier for the Subscription that will report Notifications for this MonitoredItem (see 7.14 for IntegerId definition).

timestampsToReturn

Enum

Timestamps ToReturn

An enumeration that specifies the timestamp Attributes to be transmitted for each MonitoredItem. The TimestampsToReturn enumeration is defined in 7.35.

When monitoring Events, this applies only to Event fields that are of type DataValue.

itemsToCreate []

MonitoredItem CreateRequest

A list of MonitoredItems to be created and assigned to the specified Subscription. This structure is defined in-line with the following indented items.

itemToMonitor

ReadValueId

Identifies an item in the AddressSpace to monitor. To monitor for Events, the attributeId element of the ReadValueId structure is the id of the EventNotifier Attribute. The ReadValueId type is defined in 7.24.

monitoringMode

Enum

MonitoringMode

The monitoring mode to be set for the MonitoredItem. The MonitoringMode enumeration is defined in 7.18.

requestedParameters

Monitoring Parameters

The requested monitoring parameters. Servers negotiate the values of these parameters based on the Subscription and the capabilities of the Server. The MonitoringParameters type is defined in 7.16.

Response

responseHeader

Response Header

Common response parameters (see 7.29 for ResponseHeader definition).

results []

MonitoredItem CreateResult

List of results for the MonitoredItems to create. The size and order of the list matches the size and order of the itemsToCreate request parameter. This structure is defined in-line with the following indented items.

statusCode

StatusCode

StatusCode for the MonitoredItem to create (see 7.34 for StatusCode definition).

monitoredItemId

IntegerId

Server-assigned id for the MonitoredItem (see 7.14 for IntegerId definition). This id is unique within the Subscription, but might not be unique within the Server or Session. This parameter is present only if the statusCode indicates that the MonitoredItem was successfully created.

revisedSampling Interval

Duration

The actual sampling interval that the Server will use.

This value is based on a number of factors, including capabilities of the underlying system. The Server shall always return a revisedSamplingInterval that is equal or higher than the requested samplingInterval. If the requested samplingInterval is higher than the maximum sampling interval supported by the Server, the maximum sampling interval is returned.

revisedQueueSize

Counter

The actual queue size that the Server will use.

filterResult

Extensible Parameter

MonitoringFilterResult

Contains any revised parameter values or error results associated with the MonitoringFilter specified in requestedParameters. This parameter may be null if no errors occurred. The MonitoringFilterResult parameter type is an extensible parameter type specified in 7.17.

diagnosticInfos []

DiagnosticInfo

List of diagnostic information for the MonitoredItems to create (see 7.8 for DiagnosticInfo definition). The size and order of the list matches the size and order of the itemsToCreate request parameter. This list is empty if diagnostics information was not requested in the request header or if no diagnostic information was encountered in processing of the request.