I’m running the latest OH2. I have two leak sensors that do not provide battery info, but do send a heartbeat 1x/24 hours. So, I’m trying to write a rule that will check this heart beat and if older than 24 hours, warn me that the battery is likely dead.
So I’ve attempted to do this:
I have this rule connected to a switch so I can trigger it for testing. I’ll eventually move it to something that automatically gets triggered:
This item has a “last heard from” DateTime item that gets updated with the 1x/24 hour heartbeat
My method is to take that date time item, add 24 hours to it, and compare that to the current time. If now isAfter the sensor’s last-heard-from-time + 24 hours, then I send a message.
rule "leak sensor HB check"
when
Item checkLeak changed to ON
then
//Checks for leak sensor heartbeats once per day
val basementLeakLHFExpire = new DateTime((basementLeakLHF.state as DateTimeType).plusHours(24).millis)
if (now.isAfter(basementLeakLHFExpire)){
pushover("The Basement Leak Sensor's heartbeat hasn't been detected for >24 hours, please check the battery")
logInfo("Basement Leak Sensor","!!!!!!!!!!!!!!!!!!! LHF Check timed out")
postUpdate(basementLeakLowBat,"Check")
} else {
logInfo("Basement Leak Sensor","!!!!!!!!!!!!!!!!!!! Heartbeak OK")
postUpdate(basementLeakLowBat,"OK")
}
val hwtankLeakLHFExpire = new DateTime((hwtankLeakLHF.state as DateTimeType).plusHours(24).millis)
if (now.isAfter(hwtankLeakLHFExpire)){
pushover("The Hot Water Tank Leak Sensor's heartbeat hasn't been detected for >24 hours, please check the battery"
logInfo("HWTANK Leak Sensor","!!!!!!!!!!!!!!!!!!! LHF Check timed out")
postUpdate(hwtankLeakLowBat,"Check")
} else {
logInfo("HWTANK Leak Sensor","!!!!!!!!!!!!!!!!!!! Heartbeak OK")
postUpdate(hwtankLeakLowBat,"OK")
}
end
I am getting the following error:
==> /var/log/openhab2/openhab.log <==
2018-03-13 08:27:52.616 [ERROR] [ntime.internal.engine.RuleEngineImpl] - Rule 'leak sensor HB check': 'plusHours' is not a member of 'org.eclipse.smarthome.core.library.types.DateTimeType'; line 1230, column 44, length 53
Now - I have multiple other uses of “plusHours” in other rules, so I don’t think I’m missing some kind of import or something like that. I’m guessing I’m not defining something correctly. Can anyone shed some light on what I’m doing wrong?
var DateTime basementLeakLHFExpire = new DateTime((basementLeakLHF.state as DateTimeType).calendar).plusHours(24)
var DateTime basementLeakLHFExpire = new DateTime((basementLeakLHF.state as DateTimeType).calendar.timeInMillis).plusHours(24)
val DateTime basementLeakLHFExpire = new DateTime((basementLeakLHF.state as DateTimeType).getZonedDateTime.toInstant.toEpochMilli).plusHours(24)
The method getCalendar() from the type DateTimeType is deprecated
but i don’t know if
getZonedDateTime.toInstant.toEpochMilli
works before 2.3
pushover("The Hot Water Tank Leak Sensor's heartbeat hasn't been detected for >24 hours, please check the battery"
rule "Heartbeat received"
when
Item HeartBeatSource received update
then
HeartBeat.sendCommand(ON)
end
rule "Heartbeat timer expired"
when
Item Heartbeat received command OFF
then
// code to alert that the device has been offline for too long
end
Depending on how you receive the heartbeat, you could potentially avoid needing to add the new Heartbeat Item and just add the expire to your existing heartbeat.
I use this approach for many of my sensors, though they are mostly MQTT so I don’t need a separate timer Item for the Expire binding.
It’s a little more complex with some other bindings. I wrote that up here: (Design Patterns: Generic Is Alive). Though I need to revisit that DP to take advantage of new stuff like triggeringItem.
