Qt OPC UA 6.4.1

- Qt 6.4
- Qt OPC UA
- Qt 6.4.1 Reference Documentation

# 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 v1.1, 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 GDS Support
- 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