open62541/open62541

Features

• Industrial Server Implementations - Provides a complete implementation of an OPC UA server for industrial interoperability.
• OPC UA Clients - Provides a complete client implementation to connect to remote servers using the standardized industrial protocol.
• OPC UA Stacks - Provides a complete open-source implementation of the OPC Unified Architecture standard for industrial automation and data exchange.
• Information Models - Implements an object-oriented system for defining structured hierarchies of nodes and references to represent physical assets.
• C99 Constrained Deployments - Supports deployment to embedded systems and cloud servers with a small memory footprint and C99 compliance.
• Attribute Change Notifications - Tracks changes to specific data points using monitored items to receive notifications when values update.
• Sharded Read-Write Operations - Retrieves or updates attributes of nodes in the address space using standard read and write operations.
• Address Space Management - Provides tools to add, delete, and configure variables, objects, and reference types within the address space.
• Data Change Subscriptions - Implements mechanisms for pushing real-time data changes to clients via subscriptions.
• Information Model Management - Provides tools to add, delete, and organize nodes and references within the server address space.
• Information Models - Provides an object-oriented system for defining industrial information models and asset relationships.
• Node Attribute Access - Accesses or modifies the values and metadata of nodes, including individual elements or array ranges.
• Variant Data Type Storage - Uses a variant-based generic storage system to handle scalar values and multi-dimensional arrays.
• Embedded Communication Libraries - A C99 library providing binary and JSON encoding and secure channels for resource-constrained hardware.
• Embedded Implementations - Deploying standardized communication protocols on resource-constrained hardware with minimal memory and binary footprints.
• Industrial Node Attribute Accessors - Retrieves the current values of attributes from specific nodes in the server address space.
• Industrial Node Attribute Modifiers - Updates the values of attributes for specific nodes in the server address space.
• Address Space Browsing - Discovers nodes by traversing references and translating browse paths into node identifiers.
• Address Space Path Resolvers - Processes browse path expressions to resolve nodes using reference types and browse names within the address space.
• Network Communication Implementations - Implements the standardized industrial communication protocol for data exchange between clients and servers.
• Industrial Communication Libraries - A C99 library providing binary and JSON encoding, secure channels, and pub-sub messaging for embedded and cloud systems.
• Monitored Item Subscriptions - Creates and configures subscriptions to track multiple monitored items and retrieve notifications via publish requests.
• Pluggable Network Layers - Provides a pluggable network layer allowing the communication API to be swapped for different hardware targets.
• OPC UA Servers - Provides a complete server implementation that hosts a data model and provides access to variables and methods.
• Publish-Subscribe Systems - Implements publish-subscribe messaging by creating data sets and metadata for distribution to subscribers.
• Data Change Notifications - Monitors variables for changes and triggers notifications for events, alarms, and conditions via subscriptions.
• Remote Procedure Execution - Allows clients to trigger specific functions on remote server nodes and retrieve the resulting output.
• Secure Communication Channels - Opens and manages encrypted communication channels to ensure the confidentiality and integrity of messages.
• Secure Industrial Communications - Implementing encrypted channels and certificate-based authentication to protect data exchange between industrial devices.
• Server Metadata Queries - Allows clients to issue queries to the server to retrieve filtered sets of industrial data.
• Session Establishment - Handles the creation of secure channels and authenticated sessions required to connect clients to servers.
• Global Address Space Management - Organizes industrial information into a hierarchy of nodes and references using an object-oriented type system.
• Node Method Invocation - Resolves node identifiers to execute associated logic on specific object instances.
• Node-Level Access Controls - Controls which users or clients can access or modify individual nodes within the information model.
• Communication Encryption - Secures data transmission using encryption backends such as OpenSSL or mbedTLS including hardware TPM support.
• Security and Access Control - Authenticates identities and encrypts data streams to prevent unauthorized access and ensure privacy.
• Traffic Encryption - Secures communication between clients and servers using encrypted binary protocols.
• Industrial Alarms and Events - Generates and emits alarms and conditions to notify clients of specific system occurrences.
• Monitored Item Management - Creates subscriptions to track changes in server values and receives notifications when conditions are met.
• State Change Monitoring - Sets up subscriptions and monitored items to receive automatic notifications when specific data values change.
• Server Method Exposures - Enables the attachment of executable logic to nodes in the address space for remote execution.
• Server-Side Method Invokers - Triggers functions on server objects using input arguments and receives validated outputs.
• Model Code Generators - Produces data types and server-side information models from standard XML node set definitions.
• Code Generators - Automatically generates C code for complex data types from CSV and BSD definition files.
• Historical Data Querying Interfaces - Provides interfaces to read and update historical values and events associated with nodes.
• Multi-Format Encoders - Translates complex data types between binary, JSON, and XML formats for flexible network transmission.
• Data Type Managers - Provides utilities for handling and managing standard OPC UA data types and variants.
• Data Type Mappings - Translates between application-level structures and data type descriptions for various types.
• Address Space Node Management - Adds, deletes, and manages nodes and their references within the server information hierarchy.
• Server Discovery APIs - Locates available servers and endpoint configurations using discovery services or network multicast.
• Event Loop Integrations - Supports plugging in custom event loop implementations to manage timers and asynchronous operations.
• XML to DSL Converters - Transforms XML files into source and header files to automatically instantiate information models within a server.
• Binary Data Encoding - Converts data structures to and from binary formats using configurable namespace mappings.
• Publish-Subscribe Messaging - Sets up asynchronous data exchange where servers publish data fields to middleware or subscribers.
• PubSub Subscribers - Implements subscriber logic to consume data messages from middleware based on specific data interests.
• Local Service Discovery - Locates available servers using a local discovery service with optional multicast support.
• PubSub Publishers - Implements publishing capabilities for distributing data via broker-less or broker-based transport protocols.
• Message Encoders and Decoders - Translates internal network message structures to and from binary or JSON formats.
• Custom Network Transport Layers - Plugs in custom networking APIs to support specific hardware targets or embedded environments.
• PubSub Messaging Systems - Manages real-time data distribution using publish-subscribe patterns over UDP multicast.
• Remote Procedure Calls - Executes service sets on a remote node to perform specific actions or logic.
• Service Discovery Integrations - Registers servers with discovery services to help clients find available network endpoints.
• Binary Size Optimizations - Strip debug information and disable unused features to lower the total RAM and ROM usage.
• Elliptic Curve Certificate Generators - Creates public-private key pairs and certificates using elliptic curves for secure identity verification.
• Secure Communication Implementations - Uses elliptic curve cryptography to provide strong encryption with short keys for resource-constrained deployments.
• Session and Credential Handling - Manages the creation, activation, and closure of user sessions by assigning specific attributes and context pointers.
• Session-Based Access Controls - Validates user identities and assigns roles to active sessions to restrict access to specific nodes.
• Pluggable Security Backends - Abstracts encryption and certificate management to allow swapping between providers like OpenSSL or mbedTLS.
• Role-Based Access Control - Restricts access to nodes or namespaces by assigning roles to sessions and defining permissions.
• Secure Publish-Subscribe Messaging - Encrypts and signs network messages using security policies and keys managed via a security service.
• Security Policies - Implements custom security policies and certificate handling to manage encrypted communication and identity verification.
• Server Certificate Management - Updates server certificates and manages trusted issuer lists or revocation lists at runtime.
• Certificate Trust Managers - Adds, removes, and verifies certificates within a trusted list to handle secure connections.
• Session Authentication - Authenticates requests by creating and activating application-layer sessions using software certificates and user identities.
• Async Operation Coordinators - Handle long-running read or write tasks in the background to prevent blocking the main execution loop.
• Data Encoders and Decoders - Transforms complex data types between binary, JSON, and XML formats for network transmission.
• Dynamic Address Space Management - Allows adding or removing nodes from the information model at runtime to change the server structure.
• Binary Footprint Optimizers - Allows reducing the binary footprint for embedded devices by stripping debug info and disabling unused features.
• Schema-to-Code Generators - Transforms standardized XML node set definitions into C source code to automate model instantiation.
• Asynchronous Service Invocations - Supports non-blocking service requests with callback-based responses to maintain system responsiveness.
• Asynchronous Event Loops - Manages timers and asynchronous network operations through an injectable loop that handles interrupts.
• Event Monitoring - Allows clients to receive notifications when specific events occur on monitored server nodes.
• Event Monitoring Systems - Generates events that bubble up the object hierarchy to notify monitored clients or local callbacks.
• Server Lifecycle Management - Provides mechanisms for controlling the start, stop, and operational state of the server instance.
• Miscellaneous Tools - C-based implementation of the OPC UA standard.

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