Он и в шаблонах есть: https://github.com/wirenboard/wb-mqtt-serial#%D1%82%D0%B0%D0%B1%D0%BB%D0%B8%D1%86%D0%B0-%D1%88%D0%B0%D0%B1%D0%BB%D0%BE%D0%BD%D0%BE%D0%B2-device_type