Trying to Read a MQTT
Contact Sensor_Back_Door "Back Door [%s]" <door> { mqtt="<[broker:Sonoff3/Door/Switch/:state:default]" }
I have MQTT.fx going and if i subscribe to it
Sonoff3/Door/Switch/# i can See 1 for open and 0 for closed 
could someone point to the right manual plz
log says
given command is NULL, couldn't post command for 'Sensor_Back_Door'
Can you post the subscription outpout?
I think at leat the slash after “…/Switch**/**” ist wrong.
This is my working example:
mqtt="<[mosquitto:homie/5ccf7f15b638/light/on:state:ON:true], <[mosquitto:homie/5ccf7f15b638/light/on:state:OFF:false]
subscription:
homie/5ccf7f15b638/light/on false
homie/5ccf7f15b638/light/on true
Yeap that fix it.
THANKS christoph