Help with setting / accessing global variable in app

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1

I'm simply trying to read and write some hub variables in an app. I'm getting this error:

2021-12-20 02:17:00.060 pm errororg.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'null' with class 'null' to class 'int'. Try 'java.lang.Integer' instead on line 92 (method midnightTask)

I have set the variable to a value in the Hub Variables page. I must have something very basic wrong. Code below. I have commented where line 92 is. I appreciate any help with this, or with anything you see that could be done better! Thanks!

image

definition(
...)

preferences {
page(name: "pageConfig")
}

def pageConfig() {
dynamicPage(name: "", title: "", install: true, uninstall: true, refreshInterval:0) {

section("Inputs") {
    input "pauseSchedule", "capability.switch", title: "Pause Schedule", required: true
    input "inShopToday", "capability.switch", title: "In Shop Today", required: true
    input "inOfficeToday", "capability.switch", title: "In Office Today", required: true
    input "runningNightShift", "capability.switch", title: "Running Night Shift", required: true
    input "daysToResume", "capability.variable", title: "Days To Resume", required: true
    input "officeThermostat", "capability.thermostat", title: "Office Thermostat", required: true
    input "eastShopThermostat", "capability.thermostat", title: "East Shop Thermostat", required: true
    input "westShopThermostat", "capability.thermostat", title: "West Shop Thermostat", required: true
    input "outsideTemperature", "capability.temperatureMeasurement", title: "Outside Temperature", required: true
}

}
}

def installed(switchInstance) {
log.debug "installed"
initialize()
}
def updated() {
log.debug "updated"
unsubscribe()
initialize()
}
def initialize() {
log.debug "initialize"
unschedule()
unsubscribe()

subscribe(location, "mode", modeEvent)
runEvery1Minute(checkDevices)
schedule("0 * * ? * *", midnightTask)

//Refresh devices
runRefresh()
}

def uninstalled() {
log.debug "uninstalled"
}

// Schedule refresh
def modeEvent(evt) {
log.info "New mode at " + now() + " is " + location.mode
// Force Refresh now!
refresh()
}

def checkDevices() {
log.debug "checkDevices " + pauseSchedule.currentValue("switch")
res = officeThermostat.currentValue("heatingSetpoint")
log.debug "office setpoint " + res
log.debug "outside temp " + outsideTemperature.currentValue("temperature")
log.debug "runningNightShift = " + runningNightShift.currentValue("switch")
log.debug "daysToResume = " + daysToResume.currentValue("variable")
}

def midnightTask() {
log.debug "midnight task start"
//THIS IS LINE 92:
int res = daysToResume.currentValue("variable")
log.debug "res = " + res //+ daysToResume.currentValue("variable")
if (res > 0) {
res = res - 1
daysToResume = res //.setVariable(res)
}
}

def refresh() {
log.debug "refresh"
}

def runRefresh() {
log.debug "runRefresh"
checkDevices()
}

1 Like
2 
Integer res = (Integer) this.getGlobalVar("daysToResume").value
3

Thanks for the reply. Now I'm getting a null returned:

Integer res = (Integer) this.getGlobalVar("daysToResume").value
log.debug "res = " + res

2021-12-20 03:14:00.039 pm errorjava.lang.NullPointerException: Cannot get property 'value' on null object on line 92 (method midnightTask)

In response to this code:

res = this.getGlobalVar("daysToResume")
log.debug "res = " + res

I get this log:
2021-12-20 03:18:00.039 pm debug res = null

4

My bad, capitalize DaysToResume....

5

Thank you! I just hit on that as well!
Cheers.

2 Likes
6

What about actual Hub variables. Do they still need a connecter to be used in this way

7

From an App you can directly reference Hub Variables without a connector.

8

From the app directly yes, but I was hoping to allow user selection via preferences. The hub variables are not being offered when I try capability.variable for the input type

9

Have to use getAllGlobalVars... Take a look at:

https://raw.githubusercontent.com/thebearmay/hubitat/main/apps/hubVarSync.groovy

about line 94

10

Thanks I see how you did it now, but tbh that's more convoluted than adding a connector. Hopefully one day the hub variables will be directly accessible by capability.hubvariable or something like that :smiley: