def find_ruuvitags(bt_device=''):
        """
        Find all RuuviTags. Function will print the mac and the state of the sensors when found.
        Function will execute as long as it is stopped. Stop ecexution with Crtl+C.

        Returns:
            dict: MAC and state of found sensors
        """

        log.info('Finding RuuviTags. Stop with Ctrl+C.')

        datas = dict()
        for new_data in RuuviTagSensor._get_ruuvitag_datas(bt_device=bt_device):
            if new_data[0] in datas:
                continue
            datas[new_data[0]] = new_data[1]
            log.info(new_data[0])
            log.info(new_data[1])

        return datas