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Vendor techdock
Package opcua-webapi-client
Short Description PHP client for OPC UA Web API
License MIT
Homepage https://github.com/TECHDOCK-CH/opcua-webapi-client

Keywords php client webapi opcua

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Informations about the package opcua-webapi-client

OPC UA WebAPI Client for PHP

A PHP client library for interacting with OPC UA servers via the OPC UA WebAPI. This library provides a simple and intuitive interface for reading values, browsing the address space, and performing other OPC UA operations over HTTP/HTTPS.

Features

Full support for OPC UA WebAPI operations
Read node values (single and multiple)
Browse the OPC UA address space
Support for various node ID formats (numeric, string, namespace URIs)
Comprehensive model classes for all OPC UA data types
PSR-7 compatible HTTP client (Guzzle)
Well-tested with integration examples

Requirements

PHP 8.1 or higher
ext-curl
ext-json
ext-mbstring
Guzzle HTTP client

Installation

Install via Composer:

Quick Start

Usage Examples

Reading a Single Node Value

Reading Multiple Node Values

Reading multiple nodes in a single request is more efficient:

Browsing the Address Space

Using Namespace URIs

For nodes with custom namespaces:

Error Handling

Configuration

Custom Timeouts

Custom Host

API Reference

The DefaultApi class provides the following main methods:

read(ReadRequest $request) - Read one or more node values
write(WriteRequest $request) - Write values to nodes
browse(BrowseRequest $request) - Browse the address space
browseNext(BrowseNextRequest $request) - Continue browsing
translateBrowsePathsToNodeIds(TranslateBrowsePathsToNodeIdsRequest $request) - Translate browse paths
call(CallRequest $request) - Call methods on objects
createSession(CreateSessionRequest $request) - Create a session
activateSession(ActivateSessionRequest $request) - Activate a session
closeSession(CloseSessionRequest $request) - Close a session

For detailed information about request and response models, see the classes in the src/Model directory.

Testing

Unit Tests

Run the unit tests:

Or directly with PHPUnit:

Live Integration Tests

The library includes integration tests that demonstrate real usage against the public OPC Foundation WebAPI:

Or:

Enable HTTP debugging:

The integration tests serve as comprehensive usage examples and can be found in test/Integration/LiveApiTest.php.

Node ID Formats

OPC UA supports several node ID formats:

Numeric: i=2258 (namespace 0, numeric ID 2258)
String: s=MyNode (namespace 0, string identifier)
GUID: g=09087e75-8e5e-499b-954f-f2a9603db28a
Opaque: b=M/RbKBsRVkePCePcx24oRA== (base64 encoded)
Namespace URI: nsu=urn:example:namespace;s=MyNode

Common OPC UA Node IDs

Here are some commonly used OPC UA node IDs:

i=84 - Root folder
i=85 - Objects folder
i=86 - Types folder
i=87 - Views folder
i=2253 - Server object
i=2254 - Server.ServerArray
i=2255 - Server.NamespaceArray
i=2256 - Server.ServerStatus
i=2258 - Server.ServerStatus.CurrentTime
i=2259 - Server.ServerStatus.State

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Fork the repository
Create your feature branch (git checkout -b feature/amazing-feature)
Commit your changes (git commit -m 'Add some amazing feature')
Push to the branch (git push origin feature/amazing-feature)
Open a Pull Request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Support

Issues: GitHub Issues
Email: [email protected]

Credits

Developed and maintained by TechDock.

This library is built on the OpenAPI specification provided by the OPC Foundation. The OPC UA WebAPI specification (introduced in version 1.05.04) enables standardized RESTful API access to OPC UA servers, making OPC UA more accessible to modern web and cloud applications.

Related Resources

OPC Foundation
OPC UA Specification
OPC UA WebAPI Swagger Documentation - Live interactive API documentation
OPC UA WebAPI StarterKit - Official sample applications and OpenAPI definitions
OPC UA and OpenAPI: Understanding the Integration - Comprehensive blog post explaining how OpenAPI simplifies OPC UA development
OPC UA Part 6: NodeId String Format - Specification for the string representations used in this library

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Version v0.1.0 Release 20. Oct 2025
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Requires php Version ^8.1
ext-curl Version *
ext-json Version *
ext-mbstring Version *
guzzlehttp/guzzle Version ^7.3
guzzlehttp/psr7 Version ^1.7 || ^2.0

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