Creating and Setting ValueStream programatically to a thing

[amittal-3]

Hello,

I am creating a ValueStream programatically in a service using createThing function and assigning the same to a thing using setValueStream() function.

[Reference: https://community.ptc.com/t5/ThingWorx-Developers/How-to-create-Valuestream-with-script/td-p/515958]

I have taken the necessary precautions while assigning the value stream, such as verify that the thing is created and then performing enable and restart thing

[Reference: https://community.ptc.com/t5/ThingWorx-Developers/JavaScript-CreateThing-Thing-is-not-running/td-p/508232]

But some how when I see that thing in composer, I do not see the value stream attached to it, how ever when I call 'getValueStream' for that thing it returns me the valid value stream. I can see this on "Entity Depends on" for the thing to which value stream is assigned and also on "Uses this Entity" for the created value stream.

So I assume that value stream is successfully assigned, but I cannot see it when I view that thing in Composer as shown in attached image [IMAGE1] with red selection.

Is this expected behaviour?

Thanks in Advance

Aditya Mittal

[CarlesColl]

Shouldn't be the correct behaviour, if you restart Tomcat the ValueStream is still there?

[amittal-3]

Hello Carles,

Yes you caught at the right place. I am using the Thingworx trial edition (docker version), so I restarted my docker (which implicitly means that Tomcat is restarted). After this Value stream and things that I created exists but, now those valuestreams are no longer assigned to corresponding things.

So how can we sort this problem? Any suggestions?

I can although add checks in my things at thingstart subscription to assign them value streams if they are not assigned, but I would still like to know what could have caused this issue?

Because previously not only value streams were assigned but they were functioning also as expected.

I verified this behaviour by using QueryPropertyHistory service, which fetches logged data from value stream

Please let me know your opinion about this.

Thanks and Regards

Aditya Mittal

[CarlesColl]

Can you share the code please.