Check Whether a Thing's Properties Have Changed

[Ascherer17]

I'm wanting to check whether the Thing's properties have been updated within a certain period.  I've tried the "HavePropertiesChangedSince()" service, but it seems to include the metadata properties such as "name," "description," "tags," and "thingTemplate" in its decision.  I only need to know if my custom properties (Temperature for example) have changed.

Any ideas on a way to accomplish this?  Is there a way to get a list of the custom properties on a Thing without the metadata properties?

[CarlesColl · Accepted solution]

You can build your own check easily with GetPropertyValuesAsMultiRowTable which includes last value and timestamp.

Or also you can try to subscribe to AnyDataChange event and act accordingly, I think they are not thrown for the previous properties you had said (well name and thingTemplate can't change)

[Ascherer17]

GetPropertyValuesAsMultiRowTable() still includes the metadata properties in the list of Properties. 

Also I'm finding that the timestamps for 'name', 'description', 'tags', etc. get updated every time you Save the Thing.  

[CarlesColl]

Yes I know, but it's super easy to ignore them (it are four and always the same).

[slangley]

Hi @Ascherer17.

If the response provided by @CarlesColl helped you to solve your issue, please mark it as the Accepted Solution for the benefit of others with the same question.

Regards.

--Sharon