Table of Contents

Qt OPC UA updates


Qt is switching to CMake as its internal build system for Qt6. To be included into the initial Qt 6.0 release, a module needs to be fully ported to CMake. We finished porting of Qt OPC UA recently and are looking forward to be part of the next major Qt release cycle from the beginning on. The current plan for Qt is to be complete again module-wise with Qt 6.2.

Qt OPC UA relies on the open62541 OPC UA stack. We have been using open62541 1.0 for a while, but recently have upgraded to version 1.1. One interesting feature of the 1.1 release series is the new OpenSSL plugin which can be used as a replacement for the mbedTLS plugin. Qt itself relies on OpenSSL for cryptographic primitives and functions. So we have ported the open62541 backend to the new OpenSSL plugin, thus reducing the amount of external dependencies.

Apart from that, we fixed numerous bugs and improved the automated unit tests. The full list of changes can be found here.

basysKom is offering consulting, training and development services around Qt, Qt OPC UA and open62541.

Come talk to us for feature development, bugfixing or the application of Qt OPC UA in your next project.

2 Responses

    • Hi Adam,

      thank you for the heads up on Qt options with OPC classic.

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Frank Meerkötter

Frank Meerkötter

Frank Meerkoetter is the Development Lead for basysKom GmbH, where he is consulting customers on industrial and embedded applications, often in combination with Qt. He is responsible for the technical consulting, system- and software-architecture within basysKom. He is the maintainer of Qt OPC UA and a contributor to the Qt project. He has a strong background in Embedded Linux, systems programming, distributed systems and application development. He holds a Master of Computer Science from the University of Applied Sciences in Darmstadt.
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OPC UA open62541
Frank Meerkötter
Qt OPC UA: Logging improvements in Qt 6.1

So far programs using Qt OPC UA with the open62541 back-end produced quite a bit of chatter on stdout originating from the open62541 stack itself. Unfortunately there was no simple way to get rid of these low-level logs. We now provide a way to control this behavior.

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Jannis Völker
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The open62541 OPC UA stack with its Pub-Sub extension now supports MQTT over TLS as well as MQTT-brokers requiring a login (contributed by basysKom). This allows the direct communication between open62541 and the Azure IoT Hub and therefore highly simplifies the connection of OPC UA based IoT Devices to the cloud.

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