OPC UA is a standard for data modeling and machine to machine communication originating from the industrial automation space. Nowadays it is used in a diverse, growing set of industries. Its mission statement is to enable easy integration and interoperability between machines, components and applications of different vendors. OPC UA is an important building block of the Industry 4.0 story. This presentation will highlight how Qt fits into the picture – by presenting the Qt OPC UA API, its features and capabilities. The core goal of Qt OPC UA is to make it easy to integrate OPC UA services into Qt applications. It first entered the scene as a contribution by basysKom which became a technology preview with Qt 5.11. Since then, The Qt Company and basysKom invested significantly to mature the API and to add missing features. Most prominently are the addition of support for secure connections, service discovery, events and a brand new QML API. The presentation provides a starting point to develop OPC UA enabled Qt applications and will walk the audience through a number of scenarios and how to handle them with Qt OPC UA using both the C++ and the QML API. – Basic API concepts – Connecting to a server – Browsing – Access to nodes – Monitoring values changes – Method calls – Events The presentation provides the audience with a starting point to develop their own OPC UA enabled Qt applications.