aas-thing 0.9.3

A Python toolkit for building Industry 4.0-compliant Things as Asset Administration Shells (AAS), with seamless integration into the Smart Systems Service Infrastructure (S³I).

Asset Administration Shell (AAS) Thing Python SDK

A Python toolkit for building Industry 4.0-compliant Things as Asset Administration Shells (AAS), with seamless integration into the Smart Systems Service Infrastructure (S³I). Please refer to the whitepaper for details:

Hoppen M., Chen, J., Roßmann, J. (2025) Smart Systems Service Infrastructure (S3I) — Design and deployment of the Smart Systems Service Infrastructure (S3I) for decentralized networking in Forestry 4.0. KWH4.0 Position Paper. DOI: 10.18154/RWTH-2025-03168

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Table of Contents

• Overview
• Features
  • Core Functionality
  • Roadmap
• Technical Structure
• Installation
• Documentation
• Contributing
• License

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Overview

The AAS Thing Python SDK helps you:

• Instantiate and manipulate AAS and submodels using the Eclipse BaSyx Python SDK
• Exchange standardized I4.0 messages (VDI 2193-1) over AMQP (store-and-forward) or (in future) HTTP
• Authenticate, manage and discover services, exchange information via the S³I core (IdentityProvider, Directory, Repository, Broker)

By following the AAS specification, your Things become members in Industry 4.0 ecosystems, interoperating securely and reliably.

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Features

Core Functionality

• AAS management
  Load and parse .json, .xml, or .aasx AAS on disk using BaSyx Python SDK.

• Message-based communication
  Create, send, and receive I4.0 messages (I40Message) combined with the AAS API specification defined in Specification of the Asset Administration Shell Part 2, over AMQP (store-and-forward) or (in future) HTTP.

• S³I integration

  • IdentityProvider: OpenID Connect authentication via Keycloak
  • Broker: AMQP 0.9 messaging with RabbitMQ
  • Directory & Repository: Endpoint discovery and cloud storage
    We provide a global instance of the S³I , which runs in a RWTH Aachen server and includes:

Global instance of S³I

We provide a global instance of the S³I, which runs in a server located at MMI, RWTH Aachen University and can be used for testing. It includes:

Name	Endpont
S³I IdentityProvider	https://idp.mmi-0.s3i.mmi-services.de/
S³I Broker	amqp://broker.mmi-0.s3i.mmi-services.de/
S³I Directory	https://dir.mmi-0.s3i.mmi-services.de/
S³I Repository	https://repo.mmi-0.s3i.mmi-services.de/
S³I Config	https://config.mmi-0.s3i.mmi-services.de/
S³I Postbox API	https://postbox.mmi-0.s3i.mmi-services.de/
S³I Manager (coming soon)	http://manager.mmi-0.s3i.mmi-services.de/

Roadmap of the SDK

In the near future, we will provide the supports to:

• Postbox API: REST-based alternative to AMQP for sending and receiving I4.0 messages
• Discovery Service: Endpoint discovery using query parameters
• Authorization: XACML-based access control framework
• Events: Support for AAS- and AMQP-based events
• Server Infrastructure: The open-source server infrastructure for the Smart Systems Service Infrastructure (S³I) and its configuration for docker and kubernetes

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Technical Structure

Module	Purpose
aas_thing/core.py	BaseAASThing: lifecycle, configuration, event loop
aas_thing/aas_connection.py	AASConnector: load/sync AAS & submodels
aas_thing/s3i_connection.py	S3IConnector: interface to S³I IdentityProvider, Broker
aas_thing/message_handler.py	I40SemanticProtocolHandler: handle_request, handle_reply of incoming I4.0 messages
aas_thing/s3i.identity_provider.py	S3IIdentityProviderClient: create connection to S³I IdP
aas_thing/s3i.broker.py	S3IBrokerAMQPClient: create connection to S³I Broker
aas_thing/s3i.directory.py	S3IDirectoryClient: create connection with S³I Directory
aas_thing/s3i.repository.py	S3IRepositoryClient: create connection with S³I Repository

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Installation

Install from PyPI:

$ python -m pip install aas-thing

Or build & install from source:

$ git clone [e-mail]:co2for-it/s3i/aas-thing-python-sdk.git
$ cd aas-thing-python-sdk
$ python -m pip install .

Documentation

Full API reference, tutorials, and demos are available in the documentation.

Contributing

Contributions, bug reports, and feature requests are welcome! Please:

• Fork the repository
• Create a feature branch (git checkout -b feature/XYZ)
• Commit your changes (git commit -m "Add XYZ")
• Push to your fork (git push origin feature/XYZ)
• Open a Merge Request

See CONTRIBUTING.md for detailed guidelines.

License

This project is licensed under the LGPL v3 License. See the LICENSE file for details.