I am trying to emulate an NDEF message (NFC Forum Type 4 Tag) using ReactNative. I could not find any working source code or module to achieve this. The only working application is from Maxsoft.bg named NFC NDEF Tag Emulator which is not open source.
So far I've used react-native-nfc-manager and react-native-nfc-hce, but I couldn't make it work.
I also checked the android documentation but I couldn't find a working example/sourcecode there as well.
I found it really strange that I couldn't find even one working source code! So, it would be great if you could help me with a working ReactNative or Android source code.
NDEF Message with HCE Android should provide you with the answer for Native Java for Android, the best answer also has linked a github repo with source code demo.