I am writing a Java application that sends commands to a smart card and parses responses via the NFC interface. This application can be used on both Android and PC.
Using a USB device for contactless reading of cards through a PC, I have no problems connecting and communicating with any card that I drop onto it.
Android is another matter. Using the app through Nexus S gives less desirable results, depending on the card.
Some cards will connect and communicate with a 100% success rate. Most of the cards that I tried to use, it was very difficult to even establish a connection, not to mention talking to him.
The NFC service on the Nexus S is trying to connect to the cards. It creates a continuous low impulse sound, indicating that it cannot create a strong connection (as far as I can tell).
My current process is that the Nexus S has a lower power NFC chip than I use a USB USB reader. From the other articles I read, it seems that different cards have different power requirements in order to use them.
How can I determine what level of power is needed to power the card? Is it hidden somewhere in the ATR?
How to determine what power level a particular NFC chip has? Is this somewhere documented?
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