Azure Digital Twin Step-by-step tutorial - adding more rooms to the model

Question

Azure Digital Twin Step-by-step tutorial - adding more rooms to the model

Gonzalo De La Rocha 0

Hi all, I have followed this tutorial step by step and I now have it up and running: https://learn.microsoft.com/en-us/azure/digital-twins/tutorial-end-to-end

Whilst creating the client app, the demo only shows us how to create a digital twin with 1 floor, 1 room and 1 thermostat, but for our application we require multiple such rooms and thermostats on one given floor. Whilst creating more than one room, I encounter an error which says:
Error 400: Service request failed.
Status: 400 (Bad Request)

Content:
{"error":{"code":"InvalidRelationshipData","message":"$targetId 'room101' cannot be modified. Please provide valid relationship data. See documentation on managing relationships [http://aka.ms/adtv2twins."}}]

Headers:
Strict-Transport-Security: REDACTED
Date: Sun, March 2023 10:43:00 GMT
Content-Length: 206
Content-Type: application/json; charset=utf-8

User's image

Can you please give a hand? what's the problem? what do I need to change to make it work?

Thanks in advance.

Sander van de Velde | MVP 36,951 Reputation points MVP Volunteer Moderator

2023-03-12T19:38:10.52+00:00

Hello @Anonymous ,

you want to add a new room but you get an error saying "$targetId 'room101' cannot be modified"? Or do you try to add a relationship?

We only see the error, it's not clear what action you are performing.

Can you share the logic you try to execute?
Gonzalo De La Rocha 0 Reputation points

2023-03-12T23:44:06.0366667+00:00
Hi Sander,

thanks for coming back to me. I am going to start from the beginning:

I have deployed satisfactorily the step-by-step demo following all the steps. That's all good.

As next step I wanted to add more thermostats and rooms to the digital twin design. So the results becomes more compelling to what a real solution could be in a real scenario. So far I have deployed 9 thermostats and 2 rooms, but I am struggling with the relationships (I think). See the picture below - 9 thermostats, 2 rooms and 1 floor:

Note: for the Digital Twins models (floor, room, thermostats) I am using the json files provided in the GitHub link.

What I am not able to do is to, for instance, connect more than one thermostat into the same room (eg room22 or room21) or the two rooms into the the Floor1.

When trying to do step (3) I get the error I described above. I have tried to find the error, but at this stage I am lost. Thanks in advance for your support.

Regards

1 answer

Your answer

Sander van de Velde | MVP 36,951 Reputation points MVP Volunteer Moderator

2023-03-12T19:38:10.52+00:00

Hello @Anonymous ,

you want to add a new room but you get an error saying "$targetId 'room101' cannot be modified"? Or do you try to add a relationship?

We only see the error, it's not clear what action you are performing.

Can you share the logic you try to execute?
Gonzalo De La Rocha 0 Reputation points

2023-03-12T23:44:06.0366667+00:00

Hi Sander,

thanks for coming back to me. I am going to start from the beginning:

I have deployed satisfactorily the step-by-step demo following all the steps. That's all good.

As next step I wanted to add more thermostats and rooms to the digital twin design. So the results becomes more compelling to what a real solution could be in a real scenario. So far I have deployed 9 thermostats and 2 rooms, but I am struggling with the relationships (I think). See the picture below - 9 thermostats, 2 rooms and 1 floor:

Note: for the Digital Twins models (floor, room, thermostats) I am using the json files provided in the GitHub link.

What I am not able to do is to, for instance, connect more than one thermostat into the same room (eg room22 or room21) or the two rooms into the the Floor1.

When trying to do step (3) I get the error I described above. I have tried to find the error, but at this stage I am lost. Thanks in advance for your support.

Regards

Answer 1

Sander van de Velde | MVP 36,951 MVP Volunteer Moderator

Hello @Anonymous ,

I was able to find the models and load them into an ADT environment:

User's image

As you can see, I'm able to construct relationships, including multiple thermostats in the same room.

Notice I found four models.

I then checked the models themselves, in Visual Code and it puzzles me how these are related.

There are no direct (typed) relationships between the different models...

I suggest your next steps are building new models with relationships that make sense like:

{
 "@id": "dtmi:com:adt:flightintoint:airliner;5",
 "@type": "Interface",
 "displayName": "Airliner - Flight Into IoT - Interface Model",
 "@context": "dtmi:dtdl:context;2",
 "contents": [
  {
   "@type": "Property",
   "name": "companyName",
   "description": "Name of company",
   "schema": "string"
  },
  {
   "@type": "Property",
   "name": "abbreviation",
   "description": "Abbreviation",
   "schema": "string"
  },
  {
   "@type": "Relationship",
   "@id": "dtmi:com:adt:flightintoiot:airliner_has_airplane;5",
   "name": "rel_has_airplanes",
   "displayName": "Has airplanes",
   "target": "dtmi:com:adt:flightintoiot:airplane;5"
  }
 ]
}

If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.

Gonzalo De La Rocha 0 Reputation points

2023-03-13T09:16:26.1533333+00:00

Thanks Sander. So the models are all ok and new relationships can be added between them without any modification required - following the properties definition for each model (space, floor, room, thermostat).

How did you build the additional relationships? For instance, I am using the visual code provided with the lab and there is where I get the error message I posted earlier. The screenshot below is the VS code piece that instantiates the relationships; Here is from where the error message appears --> function "cl.CommandCreateRelationship(String[11])":

Notice that I have used the same original code and then I have added additional calls to that same function in order to create the additional relations I need.

Thanks,
Sander van de Velde | MVP 36,951 Reputation points MVP Volunteer Moderator

2023-03-13T14:53:50.03+00:00

Hello @Gonzalo De la Rocha ,

I added the relations by hand using the Digital Twins Explorer (select one twin and right-click another twin to get a popup menu with the add relationship dialog).

I just wanted to validate the models without setting up a full environment.

Here is a post with another Digital Twins solution, complete with 3D visualization. Check out how the relations between models are set in the DTDL language.
AshokPeddakotla-MSFT 36,006 Reputation points Moderator

2023-03-27T16:30:03.14+00:00

@Gonzalo De la Rocha If this answers your query, do click Accept Answer and Yes if this answer helpful. And, if you have any further query do let us know.

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Azure Digital Twin Step-by-step tutorial - adding more rooms to the model

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