Receiving events from OPC UA server with QOpcUaClient

AnttiAspi

Hi,

I'm trying to receive Events coming from OPC UA Server using QOpcUaClient. I see in UA Expert that the node is sending events, but I just cannot connect the client to them in my code

Here is my code:

QOpcUaClient *mOpcUaClient = nullptr;
QScopedPointer<QOpcUaNode> m_eventNode;

...

    m_eventNode.reset(mOpcUaClient->node("ns=2;s=testObject"));
    QOpcUaMonitoringParameters monitoringParams(1000);

    QOpcUaMonitoringParameters::EventFilter filter;
    filter << QOpcUaSimpleAttributeOperand("Message"); // Select clause of the filter

    QOpcUaContentFilterElement condition;
    condition << QOpcUaContentFilterElement::FilterOperator::GreaterThanOrEqual;
    condition << QOpcUaSimpleAttributeOperand("Severity");
    condition << QOpcUaLiteralOperand(10, QOpcUa::Types::UInt16);
    filter << condition; // Where clause of the filter

    monitoringParams.setFilter(filter);
    monitoringParams.setIndexRange("0:20");

    m_eventNode->enableMonitoring(QOpcUa::NodeAttribute::EventNotifier, monitoringParams);

    QObject::connect(m_eventNode.data(), &QOpcUaNode::eventOccurred, []()
    {
        qDebug() << "OPC UA Event occurred";
    });

Calling the "enableMonitoring()" gives:
qt.opcua.plugins.open62541: Could not add monitored item for QOpcUa::NodeAttribute::EventNotifier of node "ns=2;s=testObject" : BadInternalError

The client is working fine otherwise. I'm able to read, write and subsribe values without problems.

Is there anyone who could help me with this?

Also, I would be happy to hear, if anyone could explain what the index range means and what value I should set there on line "monitoringParams.setIndexRange("0:20");"

I'm using Windows 10, Qt 5.15.2, MinGW 64 bit, Qt creator 9.0.2

ZEEVICKY

did you find any solution? I'am using QT 5.15 LTS with corresponding version of the OPC UA and get the same errors about IndexRangeInvalid or BadInternalError

NewPony

Same here i get:
qt.opcua.plugins.open62541: Could not add monitored item for QOpcUa::NodeAttribute::EventNotifier of node "ns=0;i=2311" : BadAttributeIdInvalid