def read_loop(self):
log.debug("READER: start new reading loop...")
if not self._clf:
try:
self._clf = nfc.ContactlessFrontend(probe=nfc.dev.__all__)
log.debug("READER: CLF found: " + str(self._clf))
except LookupError:
log.warning("READER: Reader device not found. Exiting")
self.Exit()
return
try:
log.debug("READER: Now start reading")
while not self._exit_reading:
if not self._pause_reading:
tag = self._clf.poll(general_bytes=None)
else:
tag = None
if not tag:
time.sleep(0.5)
continue
if isinstance(tag, nfc.Type3Tag):
log.debug("READER: New tag found: " + str(tag))
last_tag = {'idm': tag.idm, 'pmm': tag.pmm}
if tag.ndef is not None:
log.debug("READER: NDEF is present")
self._last_idm = tag.idm
last_tag['version'] = tag.ndef.version
last_tag['writeable'] = tag.ndef.writeable
last_tag['capacity'] = tag.ndef.capacity
last_tag['size'] = len(tag.ndef.message)
self._message = Message(tag.ndef.message)
log.debug("READER: NDEF Message detected: ")
log.debug("READER: type=%s" % self._message.type)
if last_tag['size']:
log.debug("READER: size: %d" % last_tag['size'])
self.NDEFMessage(tag.ndef.message) # emit
self.TagInfo(pickle.dumps(last_tag))
while tag.is_present:
time.sleep(1)
log.debug("READER: Tag removed")
except IOError:
log.warning("READER: IO Error occured. restarting...")
read_thread = Thread(target=self.read_loop, name="ReadThread")
read_thread.start()
def WriteNDEF(self, message_string):
log.info("WRITER: Writting...")
self._pause_reading = True
self._message = Message(str(message_string))
log.info("WRITER: Write message with type " + self._message.type)
if not self._clf:
try:
self._clf = nfc.ContactlessFrontend(probe=nfc.dev.__all__)
except LookupError:
log.warning("WRITER: Reader/Writer not found. Exiting")
self.Exit()
tag = None
while not tag:
tag = self._clf.poll(general_bytes=None)
if tag:
log.debug("WRITER: found tag with IDm " + tag.idm)
tag.ndef.message = self._message.tostring()
log.debug("WRITER: Writing successfully finished.")
else:
log.info("WRITER: No tag found...")
self._pause_reading = False
return
