Qt OPC UA

The Qt OPC UA module implements a Qt API to interact with OPC UA on top of a 3rd party OPC UA stack.

The stacks are integrated as plugins and can be selected at runtime. Currently, the following implementations are supported:

• Open62541 v1.3.1, MPLv2
• Unified Automation C++ SDK (UACpp), Commercial

The QML API is still in development but are available as a technology preview. This means those parts are unstable, likely to change, and provided as a convenience only.

Using the Module

QML API

The QML types are available through the QtOpcUa import. To use the types, add the following import statement to your .qml file:

import QtOpcUa as QtOpcUa

C++ API

Using the C++ API requires linking against the module library, either directly or through other dependencies. Several build tools have dedicated support for this, including CMake and qmake.

Building with CMake

Use the find_package() command to locate the needed module components in the Qt6 package:

find_package(Qt6 REQUIRED COMPONENTS OpcUa)
target_link_libraries(mytarget Qt::OpcUa)

Building with qmake

To configure the module for building with qmake, add the module as a value of the QT variable in the project's .pro file:

QT += opcua

Articles and Guides

• Overview
• Using the OpenSSL Dependency for Security Support and GDS
• Building Qt OPC UA Open62541 Plugin
• Building Qt OPC UA UACPP Plugin
• OPC UA at the OPC foundation

Examples

• Examples

Reference

• C++ Classes
• QML Types