This service provides a publicly available REST and GraphQL APIs for managing Asset Administration Shells (AAS) and AAS Submodel Templates and AAS Submodel Instances, stored in a Neo4j Graph Database.

The provided REST endpoints fully comply with the AAS OpenAPI Specification published by the IDTA.

1. An installed and running recent version of the Docker Engine.
2. Optional: A valid, personal GraphQL Frontend License Key, if you wish to use the GraphQL Frontend for accessing the GraphQL interface.
   Please refer to https://graphqlfrontend.com/ on how to obtain one.

1. Clone this repository to your local machine.
2. Optional: Open the file .env.sample with a text editor and replace the placeholder {YOUR_FRONTEND_LICENSE_KEY} with your personal GraphQL Frontend License Key and save the file as .env.
3. Run the following command in the repository root directory to download all dependencies and start the AAS Connect Backend Service

docker compose up -d

When the start-up completed, you will be able to access the following services in the browser:

• http://localhost:4000/graphql/: The GraphQL endpoint for the AAS Connect Backend Service.
• http://localhost:4000/docs/: The SwaggerUI listing and allowing access to all available REST endpoints for the AAS Connect Backend Service.
• http://localhost:4000/gui/ - The integrated BaSyx Web UI for managing AAS and AAS Submodel Data.
• http://localhost:4000/: The integrated GraphQL Frontend instance. Use the credentials aas/connect to sign in (as defined in the DEFAULT_USERNAME and DEFAULT_PASSWORD variables in the docker-compose.yml).
  The frontend will only be functional if a valid GraphQL Frontend License Key is provided in the .env file.

To stop the services, run the following command in the repository root directory:

docker compose down

All persistent data is stored outside the container in the neo4j/data and the neo4j/logs directory.

For submitting your first Asset Administration Shell (AAS) you follow this procedure (which might be automatized by your client application):

1. Create Submodel Templates for each submodel your AAS uses, using the POST /api/v1/submodel endpoint.
   The Submodel object provided in the body must have the kind property set to Template and the id should be the unique global identifier of the submodel template(!) used for creating this submodel and must differ from the id used in the submodel in the AAS.
   Templates need only to be created once and can be reused for multiple Submodel instances.
2. Create Submodel Instances for each submodel your AAS uses, using the POST /api/v1/submodel endpoint.
   The Submodel object provided in the body must have the kind property set to Instance. The id should be the same as the one used in the submodel in the AAS.
3. Create the Asset Administration Shell using the POST /api/v1/shells endpoint.
   The id's of the submodels referenced in the submodels object property of the AssetAdministrationShell object in the request body must be the ones of the Submodel Instances created in step 2. understanding how all components work together.

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