Extended Examples

Code snippets

Code snippets are simple, isolated use-cases that illustrate the use of Eclipse BaSyx. They provide focused recipes that document the intended use of the BaSyx SDK and our reference implementations of Industrie 4.0 middleware components. To keep functional examples simple, code snippets only address selected aspects of Industrie 4.0 implementations. Selected snippets provide a page with documentation. For all snippets, links to executable source code files in the git repository are provided. The snippets itself only contain the code necessary to fulfil their function. Examples on how to use the snippets can be found in the tests for the snippets.

Please keep in mind that not all features are available with all language versions of Eclipse BaSyx. Snippets therefore may only be available for selected languages.

The code for the snippets is available via the Eclipse BaSyx GIT repository:

• For Java, the code is located in the basyx.example project in package org.eclipse.basyx.examples.snippets

Asset Administration Shell (AAS)

The Asset Administration Shell snippets illustrate different aspects of the usage of the Asset Administration Shell.

Snippet	Description	Source
Create AAS	Illustrates how to create an Asset Administration Shell by instantiating a new AAS object.	Java
Add Submodel to AAS	Illustrates how to add a Submodel to an AAS object. If the AAS, the Submodel should be added to, is a ConnectedAAS (the actual AAS data is held on a server) this will upload the Submodel to the server, but not register it. You have to register it manually (see Register Submodel Snippet). Alternatively you can use the use the AASManager to add it (see Manager Snippets below), which will automatically register it.	Java
Retrieve Submodel from AAS	Illustrates how to retrieve a Submodel from an AAS object. If the Submodel to be retrieved is located on a server it is often easier to use the AASManager (see Manager Snippets below) to retrieve it, as you can get the Submodel directly without getting the AAS first.	Java
Delete Submodel from AAS	Illustrates how to delete a Submodel from an AAS object. If the AAS the Submodel should be deleted from is a ConnectedAAS (the actual AAS data is held on a server) this will delete the Submodel from the server, but not deregister it. You have to deregister it manually (see Deregister Submodel Snippet). Alternatively you can use the use the AASManager to delete it (see Manager Snippets below), which will automatically deregister it.	Java

AAS Manager

These code snippets illustrate how to use the ConnectedAssetAdministrationShellManager for interacting with BaSyx elements hosted on a server.

Snippet	Description	Source
Push AAS to server	Illustrates how to upload an AAS to a server	Java
Retrieve AAS	Illustrates how to retrieve an AAS from a server using its ID. The retrieved AAS object will be a ConnectedAAS. This “connected” object holds no data locally. Instead it contacts the server for every data transaction.	Java
Delete AAS	Illustrates how to delete an Asset Administration Shell from a server. This will also automatically deregister the AAS.	Java
Add Submodel to AAS	Illustrates how to add a Submodel to an AAS on a server. This will upload the given Submodel to the server and register it to the AAS with the given ID.	Java
Retrieve Submodel from AAS	Illustrates how to retrieve Submodels from a server using its ID and the ID of the AAS it belongs to. The retrieved Submodel object will be a ConnectedSubmodel. This “connected” object holds no data locally. Instead it contacts the server for every data transaction.	Java
Delete Submodel from AAS	Illustrates how to delete a Submodel from an AAS on a server. This will delete the Submodel with the given ID from the AAS with the given ID. It will also automatically deregister the Submodel.	Java

AAS Submodels

Asset Administration Shell Submodels may be distributed through the network. While an AAS resides on the IT and remains accessible in case of device failures, Submodels may be distributed. Submodels containing static data or information about devices that needs to remain available in case of device failure may be hosted on the IT as well; Submodels containing live data may be hosted on devices, and possibly on products. The following code snippets illustrate the creation, transfer, hosting, and use of AAS Submodels.

Snippet	Description	Source
Create Submodel	Illustrates how to create a Submodel by instantiating a new Submodel object.	Java
Add Submodel element	Illustrates how to add a Submodel element to a Submodel object	Java
Retrieve Submodel element	Illustrates how to retrieve a Submodel element from a Submodel object	Java
Delete Submodel element	Illustrates how to delete a Submodel element from a Submodel object	Java
Invoke Submodel operation	Illustrates the invokation of an Operation from Submodel object	Java
Host preconfigured Submodel	Illustrates how a preconfigured submodel can be hosted on its own server	Java

Registry

The Asset Administration Shell registry enables registration of AAS and Submodels, as well as retrieving previously registered AAS and Submodels by their IDs.

Snippet	Description	Source
Register AAS	Register AAS descriptors in registry	Java
Lookup AAS	Retrieve AAS descriptors from registry	Java
Deregister AAS	Removes AAS descriptors from registry	Java
Register Submodel	Register a Submodel to an existing AAS descriptor	Java
Lookup Submodel	Retrieve a Submodel from a registry	Java
Deregister Submodel	Removes a Submodel from a registry	Java

Virtual Automation Bus (VAB)

The Virtual Automation Bus provides end-to-end connection capabilities. The VAB uses gateways to connect network technologies into one virtual, and fully connected network. The network consists of objects, e.g. Asset Administration Shells and Submodels that are accessible through unqiue IDs. The following code snippets illustrate VAB operations and the use of the Virtual Automation Bus.

Snippet	Description	Source
CRUD operations	Illustrate creation of VAB object and use of create/update/retrieve/delete operations to manipulate it.	Java
Manual HTTP calls	Illustrate manual HTTP operations to access VAB objects via HTTP REST interface	Java
Dynamic property (Lambda)	Illustrate dynamic properties (Lambda expression) in VAB objects.	Java
Dynamic property (Class)	Illustrate the dynamic properties (Class) in VAB objects.	Java

AAS Submodel providers

Eclipse BaSyx provides pre-created AAS Submodel providers. These servlets connect existing data sources, such as textual configuration files and SQL data bases into Industrie 4.0 environments as AAS Submodels. BaSyx Submodel providers are configured with a configuration API and do not require programming knowledge to integrate data sources into Industrie 4.0 environments as AAS Submodels.

AAS Submodels (Dynamic)

Asset Administration Shell Submodels may contain dynamic properties and operations. Dynamic properties are properties whose values are generated dynamically at runtime. This may happen for example periodically, or whenever a specific information is requested. Dynamic operations are operations that may be updated at runtime. The following code snippets illustrate dynamic Submodel properties and operations.

Snippet	Description	Source
Dynamic property (Lambda)	Illustrates the creation and usage of a lambda property (i.e. a property retrieving its value from a backend at runtime)	Java

URN

Eclipse BaSyx advocates the use of URNs as unique identifiers for AAS. Code snippets illustrate the creation and use of URNs.

Snippet	Description	Source
Construct URNs	Create URNs for AAS and globally idenfied Submodels	Java

Deployment with Docker

The deployment of the different SDKs and components with docker is explained in its own page.

Monitoring Applications (AAS Dashboards)

The integration with third-party applications & tools enable the possibility to monitor Asset Administration Shell and visualize its data through Dashboards. The integration and its use is explained in here [page].