Apache Avro is a framework for data serialization by Apache Hadoop. It is mainly used in big data processing but how does it compare to protobuf? Lets take a look.
Companion specifications complement OPC UA with the goal of fostering interoperability. This article will provide an overview about implementing a Companion Specification with open62541.
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.
Porting a Qt 5 QML application to Qt 6 doesn’t have to be difficult. We want to share the issues we had and how we solved them. Look out for your shaders and modules.
Something that has traditionally been complicated to achieve in Qt/QML, especially on low end hardware, is high performant list scrolling with complex delegates.
This has recently changed. In Qt 5.15, it is as simple as setting the new QML ListView property called reuseItems to true. For more details, have a look at the documentation.
In this blog post, I will explain how you can implement this feature in Qt Versions prior to 5.15.
The Qt OPC UA module has been ported to CMake and will be part of Qt 6 right from the first release.
In addition to numerous bug fixes and improved test coverage, the open62541 plugin has been updated to open62541 v1.1 and uses OpenSSL for security support, thus removing the dependency on mbedTLS.
basysKom recently extended this plugin to also accept PEM-based input. PEM is a file format used for certificates and keys which is specified by an RFC and is a preferred format for a lot of open source software. The pull request has been merged and our contribution is available from the 1.1 branch (and will also hit the master branch soon).
In this blog we will cross compile Flutter for a generic ARMv7 Embedded Linux target. We will prepare the sdk, compile flutter and in the end run some demos.
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.
The Device Provisioning Service is a managed service running in the Azure cloud which supports automatic provisioning of IoT devices for IoT Hub.
The following sections will give a short introduction to the most important features of the Device Provisioning Service.
In the third part of our series, we show how Protobuf messages from the IoT Hub can be processed in Azure Functions.
Wir setzen aus Überzeugung – und umfassender Erfahrung – auf Open Source Software. Unsere eingespielten Mitarbeiter verfügen über eine hohe Identifikation mit Ihren Themen und viele besitzen mehr als zehn Jahre Erfahrung mit Qt/QML. Dank flacher Hierarchien und bester Vernetzung zwischen unseren Teams bieten wir Ihnen einen optimalen Informationsfluss und ein Kompetenzportfolio, das weit über einzelne Personen hinausreicht.
Wir setzen seit Jahren auf eine vertrauensvolle und intensive Zusammenarbeit mit unseren Kunden und übernehmen volle Verantwortung für Ihre Aufgabenstellungen.
