[SOLVED]Correct syntax for historicState(now.minusMinutes(VALUE))

Setup, Configuration and Use Scripts & Rules
1

I’m calculating heating times for my watertank and want to know how much oil I need to heat the tank.
the syntax for:

val Number Temp_t2 = Boiler_Temperatur.historicState(now.minusMinutes(timeONtoOFF)).state as DecimalType

seems to be wrong. entering a value instead of timeONtoOFF works fine. why is now.minusMinutes(timeONtoOFF)).state not working? timeONtoOFF is a value already, isn’t it?

var Number heatON = 0
var Number heatOFF = 0
var Number timeOFFtoON = 0
var Number timeONtoOFF = 0


rule "watertank is heating"
    when 
        Item Boiler_Temperatur changed
    then
            logInfo("Watertank temp actual: " + Boiler_Temperatur.state +"°", "previous: " + previousState  + "°")
            if (Boiler_Temperatur.state > previousState as DecimalType ) {
                if (Boilerheating.state == OFF) Boilerheating.sendCommand(ON)
                }
            else if ((Boiler_Temperatur.state < previousState as DecimalType) && Boilerheating.state == ON) Boilerheating.sendCommand(OFF)                     
    end


rule "Boilertemperatur Differenz letzte Stunde"
    when
        Item Boiler_Temperatur changed
    then
        val Number Temp_t1 = Boiler_Temperatur.historicState(now.minusHours(1)).state as DecimalType
        val Number Temp_t0 = Boiler_Temperatur.state as DecimalType
        Tempdiff.sendCommand(Temp_t0-Temp_t1)
    end

rule "Heizzeiten"
    when 
        Item Boilerheating changed
    then
        switch Boilerheating.state {
            case ON: {
                heatON = now.millis
                timeOFFtoON = (now.millis - heatOFF) / 60000
                BoilerOFFtoON.postUpdate(timeOFFtoON)
                logInfo("testrule", "Boiler hält Temp für: " + timeOFFtoON + " minutes")
                }
            case OFF: {
                heatOFF = now.millis
                timeONtoOFF = (now.millis - heatON) / 60000
                BoilerONtoOFF.postUpdate(timeONtoOFF)
                logInfo("testrule", "Boiler benötigt zum Aufheizen: " + timeONtoOFF + " minutes")
                val Number Temp_t2 = Boiler_Temperatur.historicState(now.minusMinutes(timeONtoOFF)).state as DecimalType
                val Number Temp_t3 = Boiler_Temperatur.state as DecimalType
                val Number kWh = 300 * 4.18 * (Temp_t3 - Temp_t2) * 0.000277777777777778
                logInfo("testrule", "Boiler benötigt zum Aufheizen: " + kWh + " kWh")
                val Number literoel = kWh / 10.7
                logInfo("testrule", "Boiler benötigt: " + literoel + " Liter Öl zum Aufheizen")
                val Number OelSumme = (Heizoel_Boiler.state as DecimalType) + literoel
                Heizoel_Boiler.postUpdate(OelSumme)
                }      
        }              
   end
2

The now.xxx methods take an int as arguments, try this:

now.minusMinutes(timeONtoOFF.intValue)
3

thanks for the quick reply, Vincent! my rule works now…
btw. is there a documentation where I can find such commands, syntax, etc.?

4

There is an Xtend docs here: https://www.eclipse.org/xtend/documentation/101_gettingstarted.html

For there rest, searching the forum, especially in the solutions and tutorials categories is your friend