Petr,
You want to buy the 2.8" Nextion.? And I would strongly recommend buying the "enhanced" (NX3224K028) models.? The Basic model has a slower graphics engine and more limited memory.? For a few more euros/dollars you can set yourself up for any future enhancements that might be added. The "Discovery" model looks to be a replacement for the Basic. However, there are currently no "tft" files generated for the Discovery so you would have to go back to the .HMI files and use the Nextion editor to generate them yourself. (I can help you if you go this route).
With that said, you could get away with the Basic.? The QR Code backup facility that was provided on the Nextion is basically broken because the web service that KD8CEC offered is broken or disabled. That takes up a lot of memory. So in the next round of Nextion screen "upgrades" for KD8CEC 2.0, that feature will be gone.?
73
Mark
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AJ6CU
KD8CEC 2.0, Nextion Screens,? and open source uBITX Raduino boards for Arduino IOT, BLE, RP2040, Teensy 4.0, and Raspberry Pi Pico
https://github.com/aj6cu
