I've been reading a while and test some of the found "possible" solutions but they don't work.
I wanna write a Mifare card with a NDEFRecord in order to get it from the mobile. I have develop the midlet and test it with the emulator and it works fine. But when going to the real mobile it doesn't.
Initially I check with keys on the card set to FF..FF but the data is not written on the card. Then I have tried to map the binary stored in the simulated card and place it on my Mifare card, but no success.
Besides that when I set the writter class, it detects the card with the NDEFTagConnection, but when doing the conn.writeNDEF() it launches a "no class def found error " and application is ended. I'm using 5.12 version of 6131.
Exception that shows up on writeNDEF():
No Class Def Found Error
How do I have to set my Mifare card to be read/written from the mobile? What are the keys and the format?