To add a device to OpenHAB, we need to configure four files:

• /configurations/openhab.cfg
• /configurations/items
• /configurations/sitemap
• /configurations/rules/

Under /configurations/openhab.cfg:

Turn on MQTT

################################### MQTT Transport #########################################
#

mqtt:mymosquitto.url=tcp://localhost:1883

mqtt:mymosquitto.qos=0

mqtt:mymosquitto.retain=true

mqtt:mymosquitto.async=true

Under /configurations/items/demo.items:

Number itm_garage_dist "Garage Dist [%.1f Inch]" (ALL) {mqtt="<[mymosquitto:4032:state:default]"}

Contact itm_my_gar_door "Garage Door Status [MAP(en.map):%s]" <garage> (ALL)

Under /configurations/sitemap/demo.sitemap:

Frame label="Garage"
    
{
Text item=itm_my_gar_door label="Garage Door Status [%s]"
}

Under /configurations/rules/:

rule "Convert Door"
when

Item itm_garage_dist received update

then
        
if(itm_garage_dist.state < 19)

{

itm_my_gar_door.state = OPEN

}

else

{

itm_my_gar_door.state = CLOSED

}

end