nfc_interface.py

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import nfc


class NFCInterface:

    def __init__(self,
                 path='usb',
                 targets=['106A', '106B', '212F']):
        """
        Args:
          path(str):
            path to NFC device.
            please see reference of nfc.ContactlessFrontEnd.open().
            https://nfcpy.readthedocs.io/en/latest/modules/clf.html#nfc.clf.ContactlessFrontend.open
        """
        self.targets = targets
        self.clf = nfc.ContactlessFrontend(path)

    def __del__(self):

        self.clf.close()

    def read_card(
            self,
            targets=None,
            on_startup=lambda targets: targets,
            on_discover=lambda target: True,
            on_connect=lambda tag: False,
            on_release=lambda tag: False):

        if targets is None:
            targets = self.targets
        tag = self.clf.connect(
            rdwr={
                'targets': targets,
                'on-startup': on_startup,
                'on-discover': on_discover,
                'on-connect': on_connect,
                'on-release': on_release,
            }
        )
        return tag