import time
import ndef
import nfc
from nfc.clf import RemoteTarget

clf = nfc.ContactlessFrontend()
assert clf.open('tty:USB0:pn532') is True   # open /dev/ttyUSB0 with pn532 driver

while True:
    target = clf.sense(RemoteTarget('106A'), RemoteTarget('106B'), RemoteTarget('212F'))
    if target is not None:
        tag = nfc.tag.activate(clf, target)
        print(tag)
        if tag.ndef is not None:
            for record in tag.ndef.records:
                print(record)
        else:
            print("EMPTY TAG - WRITING...")
            if not tag.ndef.is_writeable:
                print("This Tag is not writeable.")
                break
            tag.format()
            ret = tag.wr

            if ret:
                print("ERROR")
            else:
                print("OK")
    else:
        print("NO TARGET")
    time.sleep(0.1)

print("EXITING")
clf.close()