Mqtt binding not triggering when state is changed via rules

Setup, Configuration and Use Beginners
1

Hi folks,

Probably a noob question. I’ve got a switch bound to an mqtt trigger. If I use the GUI the mqtt binding is triggered and the state is published to the mqtt broker. However if the state of this switch is changed via a rule I’ve got the mqtt binding doesn’t seem to get triggered. The rule I have is watching the Item temperature and turning on or off the heater & cooler switches.

How do I get the mqtt binding triggered when I change the state based on rules?

My Items config looks like this:
Switch Heating_GF_Kitchen "Kitchen heater" <heating> (GF_Kitchen,Heating) { mqtt="> [mosquitto:/myhouse/kitchen/Heating_GF_Kitchen:command:ON:1],>[mosquitto:/myhouse/kitchen/Heating_GF_Kitchen:command:OFF:0]" } Switch Cooler_GF_Kitchen "Kitchen cooler" <heating> (GF_Kitchen,Heating) { mqtt=">[mosquitto:/myhouse/kitchen/Cooler_GF_Kitchen:command:ON:1],>[mosquitto:/myhouse/kitchen/Cooler_GF_Kitchen:command:OFF:0]" }

My rules file looks like this:
`import org.openhab.core.library.types.*
import org.openhab.core.persistence.*
import org.openhab.model.script.actions.*
import org.joda.time.*

var int tempHigh = 26
var int tempLow = 25

/* Turn on Kitchen heater when temp is below tempLow */
rule "Control Kitchen heater"
when
Item Temperature_GF_Kitchen received update
then
if (Temperature_GF_Kitchen.state < tempLow)
postUpdate(Heating_GF_Kitchen, ON)
else if (Temperature_GF_Kitchen.state >= tempLow)
postUpdate(Heating_GF_Kitchen, OFF)
end

/* Turn on the cooler if above tempHigh */

rule "Control Kitchen Cooler"
when
Item Temperature_GF_Kitchen received update
then
if (Temperature_GF_Kitchen.state > tempHigh)
postUpdate(Cooler_GF_Kitchen, ON)
else if (Temperature_GF_Kitchen.state <= tempHigh)
postUpdate(Cooler_GF_Kitchen, OFF)
end`

Thanks in advance.

Regards
Kheeran

2

(Unwanted space between > and [.)

Change your rules to sendCommand instead of postUpdate, since your items are bound to publish on topics when commands are received, not when state is changed.

3

Thanks watou, that was the bit of my understanding that was missing. It works now.

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