Hi bancroft,
Thank you for your reply.
I actually used the project below (which is listed on this website as Arduino x Stone HMI sample project) as reference: https://www.electroniclinic.com/arduino-hmi-tft-lcd-module-electrical-load-controller/
The GUI values and the source code was based on this too. The values set on the GUI (variable memory address, key hex return values) are not written anywhere on the Arduino source code. Hope you can help me review that one too. Thanks alot! 🙂