Configuration rules

Hello fibu and Rich.
I just test this rule and it works fine, the mainly problem was I dont understood the difference between “received update” and “changed status”.

rule "vol+"
when
Item Volumen changed
then
val eject=executeCommandLine("mosquitto_pub -u openhabian -P 7121799422 -t broadlink/televisor/boton/volsubir -m play-34ea346ff7ac" ,100000)
val eject1=executeCommandLine("mosquitto_pub -u openhabian -P 7121799422 -t broadlink/televisor/boton/volsubir -m play-34ea346ff7ac" ,100000)
val eject2=executeCommandLine("mosquitto_pub -u openhabian -P 7121799422 -t broadlink/televisor/boton/volsubir -m play-34ea346ff7ac" ,100000)
 logInfo("mqtt", eject, eject1, eject2)
Volumen.sendCommand(0)
end

I wiil read the recomendation of Rich about Design Pattern: Proxy Item and I will use it in my proyect.

Thanks