I have to develop an Android application for access control system, specifically an application that communicates the smartphone with the reader (NXP PN7150 reader) via Near Field Communication interface of smartphones. Is it that possible?
Of course it is possible !
PN7150 implement full NFC functionality (reader/writer, P2P and card emulation) as the Android phone.
If you are using PN7150 in reader mode, you can implement Android application using the card emulation mode: Host-based Card Emulation | Android Developers
Otherwise, if using the PN7150 in P2P mode, you can use Android beam from your application (NFC Basics | Android Developers) to share NDEF message from PN7150 to the phone or from the phone to the PN7150.
Finally, using PN7150 in card emulation mode you can easily share NDEF message from PN7150 to the phone: NFC Basics | Android Developers
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