I'm new with arduino and i'm trying to use the MQ-135 sensor.
I'm using this software arduino-mysensors-contribs/AirQuality-MQ135.ino at master · empierre/arduino-mysensors-contribs · GitHub
but i have an error:
#error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless.
Can someone explain me this problem? Thanks!