Persistence deltaBetween error

Setup, Configuration and Use Scripts & Rules
1

Hi,

I’m struggeling using deltaBetween with rrd4j persistance service. I get the following error:

2022-07-03 16:11:42.580 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID 'zaehler-2' failed: 'deltaBetween' is not a member of 'org.openhab.core.library.items.NumberItem'; line 34, column 25, length 51 in zaehler

Documentation says: <item>.deltaBetween(ZonedDateTime, ZonedDateTime) Gets the difference in value of the State of a given Item between certain points in time

So, I’m using it just like deltaSince which is working fine.

val Number DayOfMonth = now.getDayOfMonth()
val Number StromVerbrauchM  = vzloggerMQTTThing_Zaehler.deltaSince(now.minusDays(DayOfMonth).with(LocalTime.MAX))
val Number StromVerbrauchM1 = vzloggerMQTTThing_Zaehler.deltaBetween(now.minusMonths(1).minusDays(DayOfMonth).with(LocalTime.MAX),now.minusDays(DayOfMonth).with(LocalTime.MAX))

Also I have a strange issue that the deltaSince line throughs an error every day at 1am and only at 1am:

2022-07-09 01:00:15.116 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID ‘zaehler-2’ failed: null in zaehler
2022-07-09 01:00:45.116 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID ‘zaehler-2’ failed: null in zaehler
2022-07-10 01:00:15.201 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID ‘zaehler-2’ failed: null in zaehler
2022-07-10 01:00:45.189 [ERROR] [internal.handler.ScriptActionHandler] - Script execution of rule with UID ‘zaehler-2’ failed: null in zaehler

How do I protect against “null” in deltaSince? This is using OH-3.3.0.M5 in Docker.

Thanks

2

There is no 3.3.0.RC5. Can you check which version you are actually using?

3

… upps, sorry - I mean 3.3.0.M5

4

Then that is the answer. This feature was merged one day after 3.3.0.M6 was released, so it’s in the RCs and the release but nor in any milestone.

5

OK, great - that - using release version 3.3.0 now - resolves the deltaBetween error.

What about the other issue - how to catch “null” for deltaSince and deltaBetween calls? I understand rrd4j returns null in case no data can be found for that date & time. Can I ignor the error if valid data is sent later?

Thanks

6

The question is what is null. I guess you use the values returned for another calculation. You should add a check for null in the rule, because null is a valid return value and you need to exit the rule if you encounter that.