1、How to read nfc constantly :
Please refer the guide:http://service.telpo.net:8091/index/user/fetfile?key=7lgtEUdTsp5jGvV9
2、This module is non-Android standard NFC SDK, so there is no intent to detect and listen for the card
Here's an example of how to loop check card
Regarding password verification and read/write card operations, it depends on your logic, just like android NFC, you need to write code to verify your password and read/write operations.