RFLink Binary Sensor component?

Currently I think this component doesn’t exist (and perhaps there are technical reasons for that), and it would I think make integration so much easier with 433Mhz sensors that have only one state message “on”, but no “off”.

Similar RF hub hardware RFXtrx does deal with RF binary sensors with one message state it seems…

off_delay (Optional): For sensors that only sends ‘On’ state updates, this variable sets a delay after which the sensor state will be updated back to ‘Off’.

Yes, my smoke detectors would be the perfect example for this.