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Hi,
I have a Thing with some logged properties. Properties are defined in the ThingTemplate as logged, not persistent, not read-only. I also tried direct logged properties with the Thing not from the ThingTemplate.
I have a ValueStream created and have it attached to the Thing. Property values change regularly on a Timer event (and manually).
How can I access the logged values for the logged properties either from the value stream or the thing itself? I don't see any ValueStream services for accessing the stream values. The documentation does not speak to how to get value stream data. What do I miss?
Calling service GetLoggedProperties on the Thing returns the logged properties, so this is OK.
Calling service GetPropertyLogging on the direct properties returns true, on a inherited properties from the template returns an error.
Thingworx 5.0.2.33
Much appreciated!
Hi Dwight,
I'm working on getting some documentation together for the
Services
of aValue Stream
. For the time being, I can tell you theServices
for retrieving logged property values are on theThing
with the properties being logged. There are a number ofServices
for querying data for each basetype includingQueryBooleanPropertyHistory()
,QueryNumberPropertyHistory()
andQueryInfoTablePropertyHistory()
to name a few.I'll have to look into the error you're getting when calling
GetPropertyLogging()
onProperties
inherited from aThingTemplate
. What is the error message?Regards,
Adam
Adam: The comment below should have been a reply to your post. Thanks
Hi Adam,
thanks a lot. The QueryTypePropertyHistory Services on the Thing with the logged property work for me.
Regarding the observed error (is not a blocker for us): When I call Thing.GetPropertyLogging with a property inherited from the ThingTemplate, I get:
When I make this call with a property that I define directly with the Thing, I get a normal result. Independent of that, I can query the property history for all logged properties. Thing.GetLoggedProperties also returns all inherited and direct properties just fine.
Thanks!
Sure thing. I was able to reproduce this issue and I've logged it in our case tracker.