Using Waveshare NFC E-paper

1. I use SDK library provided by Waveshare company to support these devices. So I can change nothing inside this module
2. Possible reasons:
Reason number 1. wrong phone placement over Waveshare NFC E-paper. Solution: try to change phone position
Reason number 2. Waveshare NFC E-paper does not support some Samsung phone models. You can read about this here (red text): https://www.waveshare.com/wiki/2.7inch_NFC-Powered_e-Paper_Module#Support
but I was reported some Samsung models works fine:
* Samsung S21 worked
* Samsung S23 worked
* Samsung S24 worked
* Samsung S24 Ultra worked
* Samsung S7 worked
* Samsung A56 worked
Solution: try to change phone
Reason number 3. latest models of Waveshare NFC E-paper has new chip. You can read about this here (red text): https://www.waveshare.com/wiki/2.7inch_NFC-Powered_e-Paper_Module#Support. This chip is not supported by SDK library yet. Solution: Wating for SDK library new release from Waveshare company. Or export trajectory table or reticle to png-file and transfer it to device with Waveshare application