def dar_masa():
channel = init_channel()
rfid = RFID(channel)
fan = FanCoolers(channel)
fan.set_speed(0)
tags = rfid.get_tags()
serial_number = tags[0]['serial_number'][0]
todo_bien = True
tag = get_tag()
while todo_bien:
rfid.write_tag(array_to_string(serial_number), 4, TOKEN, tag)
rfid_data = rfid.get_tag_data(serial_number)
todo_bien = rfid_data is not None
