opcua::services::MonitoringParametersEx Struct Reference

#include <monitoreditem.hpp>

Detailed Description

Extended monitoring parameters with default values from open62541.

This is an extended version of UA_MonitoringParameters with the timestamps parameter.

See also

https://reference.opcfoundation.org/Core/Part4/v105/docs/7.21

Examples

client_async.cpp, and client_subscription.cpp.

Definition at line 53 of file monitoreditem.hpp.

Public Attributes
TimestampsToReturn	timestamps = TimestampsToReturn::Both
double	samplingInterval = 250.0
ExtensionObject	filter
uint32_t	queueSize = 1
bool	discardOldest = true

Member Data Documentation

timestamps

TimestampsToReturn opcua::services::MonitoringParametersEx::timestamps = TimestampsToReturn::Both

Timestamps to be transmitted.

Definition at line 55 of file monitoreditem.hpp.

Referenced by opcua::services::createMonitoredItemDataChangeAsync(), and opcua::services::createMonitoredItemEventAsync().

samplingInterval

double opcua::services::MonitoringParametersEx::samplingInterval = 250.0

Interval in milliseconds that defines the fastest rate at which the MonitoredItem should be accessed and evaluated.

The following values have special meaning:

• 0.0 to use the fastest practical rate
• -1.0 to use the default sampling interval (publishing interval of the subscription)

Examples

client_subscription.cpp.

Definition at line 60 of file monitoreditem.hpp.

filter

ExtensionObject opcua::services::MonitoringParametersEx::filter

Filter is used by the server to determine if the MonitoredItem should generate notifications.

The filter parameter type is an extensible parameter type and can be, for example, of type DataChangeFilter, EventFilter or AggregateFilter.

See also

https://reference.opcfoundation.org/Core/Part4/v105/docs/7.22

Definition at line 65 of file monitoreditem.hpp.

Referenced by opcua::Subscription< Connection >::subscribeEvent().

queueSize

uint32_t opcua::services::MonitoringParametersEx::queueSize = 1

Size of the MonitoringItem queue.

The following values have special meaning:

• 0 to retrieve the server's default queue size
• 1 to retrieve the server's minimum queue size In the case of a queue overflow, an Event of the type EventQueueOverflowEventType is generated.

Definition at line 72 of file monitoreditem.hpp.

discardOldest

bool opcua::services::MonitoringParametersEx::discardOldest = true

Discard policy when the queue is full.

• true: the oldest (first) notification in the queue is discarded
• false: the last notification added to the queue gets replaced with the new notification

Definition at line 76 of file monitoreditem.hpp.