Sonoff NSPanel protocol and hacking information and Tasmota Berry driver.
NSPanel protocol manual
Tasmota driver nspanel.be
Installation and configuration for Tasmota
eu-background.xcf
- Gimp format XCF file to help you layout your custom UI. Set as the background image in Nextion Editor then use vis <id>,0
to hide it. It shows the section of the screen which is hidden by the bezel in the EU version. The alignment marks take this in to account, so the centre intersection in the image is the centre of the screen on the real device.