Qt 5.15.2 and RaspberryPi4: Problems with OPC-UA Client

Mauda

Dear Community,

currently I am trying to set up an OPC-UA Client, which I would like to run on a Raspberry Pi 4. I am using a Xubuntu 20.04 Virtual Machine and Qt 5.15.2 for Development tasks. I have some problems with compiling the "connecToEndpoint" function and I cannot find the solution for this problem.

For the deployment of the modules "qtbase" and "qtopcua" on the Raspberry Pi 4 I used this guide for cross compilation: https://wapel.de/?p=842

Here is the part of project, which is not working:

void OpcuaModuleBackend::connectToEndpoint(const QString &url, qint32 index)
{
    if (m_connected)
        return;

    QOpcUaProvider provider;

    if (index < 0 || index >= m_backends.size())
        return; // Invalid index

    if (!m_client || (m_client && m_client->backend() != m_backends.at(index))) {
        m_client.reset(provider.createClient(m_backends.at(index)));
        if (m_client)
            QObject::connect(m_client.data(), &QOpcUaClient::stateChanged, this, &OpcuaModuleBackend::clientStateHandler);
    }

    if (!m_client) {
        qWarning() << "Could not create client";
        m_successfullyCreated = false;
        return;
    }

    m_successfullyCreated = true;
    m_client->connectToEndpoint(QUrl(url));
}

And the error message after compiling:

Is there anyone, who had the same problem?
What can be the solution for this problem?

Thank you in Advance!

jsulm

@Mauda The error messages are actually quite clear: there is no connectToEndpoint() method in QOpcUaClient which takes a QUrl parameter. You also can see it if you check documentation: https://doc-snapshots.qt.io/qtopcua/qopcuaclient.html#connectToEndpoint
You have to pass a parameter of type https://doc-snapshots.qt.io/qtopcua/qopcuaendpointdescription.html

Mauda

Dear jsulm,

thank you for your reply and your help with description link.
That helped to solve the problem by my own.

I replaced

m_client->connectToEndpoint(QUrl(url));

by

    QOpcUaEndpointDescription d;
    d.setSecurityMode(QOpcUaEndpointDescription::None);
    d.setSecurityPolicy("http://opcfoundation.org/UA/SecurityPolicy#None");
    d.setEndpointUrl("ServerAdress"); //Add your server adress
    m_client->connectToEndpoint(d);