@Christian-Ehrlicher many thanks for fast response

You can try compiling QtOpcua module using your Qt 5.6 toolkit and toolchain. If that works, then you should be able to deploy it to your device and use it in your project. If it does not work, then find a different board ;-) Or perhaps use linuxdeployqt to create a self-contained package that will shich Qt together with it. I have no idea if this will work on an embedded device - it's definitely not a standard use of this tool.

@Opa114 Thanks for the feedback. So please mark this topic as SOLVED now.

Great! Thanks for sharing your solution!

Probably not finding the OpenSSL dlls when running. Go to the Run part of the Project panel and edit the PATH environment variable there. Add the path to where the OpenSSL dlls can be found and re-run the application.

Yeah but so far I couldn't even compile. Now that I figured out I will run to check if this good is good enough for me. Thank you a lot.