Notify-No-Events

definition(
    name: "Notify No Events",
    namespace: "hubitat",
    author: "Bruce Ravenel",
    description: "Notify when no event",
    category: "Convenience",
    iconUrl: "",
    iconX2Url: "")

preferences {
	page(name: "mainPage")
}

def mainPage() {
	dynamicPage(name: "mainPage", title: " ", install: true, uninstall: true) {
		section {
			input "thisName", "text", title: "Name this notifier", submitOnChange: true
			if(thisName) app.updateLabel("$thisName")
			input "meters", "capability.powerMeter", title: "Select Power Meters", submitOnChange: true, required: true, multiple: true
			input "period", "number", title: "Enter number of minutes to wait", range: "0..*", submitOnChange: true, required: true
			input "notify", "capability.notification", title: "Select Notification Device", submitOnChange: true, required: true
		}
	}
}

def installed() {
	initialize()
}

def updated() {
	unsubscribe()
	unschedule()
	initialize()
}

def initialize() {
	subscribe(meters, "power", handler)
	runIn(period * 60, timeUp)
}

def handler(evt) {
	unschedule()
	runIn(period * 60, timeUp)
}

def timeUp() {
	notify.deviceNotification("No event for $period minutes from $meters")
}