[Announcement] v1.5.0 Release

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Julius Pfrommer

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Feb 2, 2026, 1:06:19 AM (6 days ago) Feb 2
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Dear all,

 

We just released v1.5.0, the first release of the 1.5 series.

Thanks to everybody whose effort contributed to this!

 

You can get it on Github at https://github.com/open62541/open62541/releases/tag/v1.5.0.

The release notes are included below.

 

Best regards,

Julius Pfrommer

 

---

 

This release v1.5.0 is the first of the 1.5 release series of open62541.

 

open62541 (http://open62541.org) is an open source implementation of OPC UA (OPC Unified Architecture / IEC 62541) written in the C language. The library is usable with all major compilers and provides the necessary tools to implement dedicated OPC UA clients and servers, or to integrate OPC UA-based communication into existing applications. The open62541 library is platform independent: All platform-specific functionality is implemented via exchangeable plugins for easy porting to different (embedded) targets.

 

open62541 is licensed under the Mozilla Public License v2.0 (MPLv2). This allows the open62541 library to be combined and distributed with any proprietary software. Only changes to the open62541 library itself need to be licensed under the MPLv2 when copied and distributed. The plugins, as well as the server and client examples are in the public domain (CC0 license). They can be reused under any license and changes do not have to be published.

 

Important changes compared to the previous v1.5.0-rc2 release candidate include:

  • server: Internal getNodeType returns node with only selected attributes and references
  • server: Auto-switch from reference arrays to reference trees
  • server: Move UA_Node_insertOrUpdateDisplayName/Description into the public Nodestore API
  • server: Improve logging of the AddNodes service
  • server: The server can load custom datatypes "internally" at runtime
  • server: Keep dedicated authentication SecurityPolicy to the Session
  • server: Use the session PKI (CertificateGroup) to re-validate the client certificate during CreateSession
  • server: use UA_ByteString_memZero to wipe private key
  • server: The static rx/tx buffer size from the EventLoop is used for the ConnectionConfig
  • client: Use the ApplicationCertificate during CreateSession from the SecurityPolicy that will be used to authenticate in ActivateSession
  • deps: Update the nodeset loader to the upstream master
  • deps: Fix incorrect padding handling in deps/base64.c
  • nodeset-compiler: Generate members array for enum types
  • tests: Add fuzzing of PubSub binary NetworkMessage decoding
  • tests: Add fuzzing of PubSub JSON NetworkMessage decoding
  • build: Enable win32 and posix compatible amalgamation with UA_ARCHITECTURE=none

 

Diff stat against the previous v1.5.0-rc2: 93 files changed, 3328 insertions(+), 1885 deletions(-)

 

New features and major changes compared to the previous 1.4 release series include:

  • core: JSON de/encoding according to the OPC UA 1.05 specification
  • core: XML de/encoding of Variants (also with multi-dimensional arrays) and structure-types
  • core: UA_String_format with shorthands to print OPC UA builtin types
  • arch: Support for FreeRTOS (using the lwip EventLoop)
  • arch: Support for QNX
  • arch: Support for Zephyr
  • server: Support for "local" Event-MonitoredItems
  • server: Extended async operations (read/write/call)
  • server: Improved value source API for VariableNodes
  • server: Implement CertificateGroup handling
  • server: Support for GDS push operations
  • client: Transparent mapping between local and remote namespace-indices
  • client: Automatically read the NamespaceArray during connect (add to the namespace mapping)
  • client: Support for Event-MonitoredItems
  • client: All async service APIs are typed
  • client: Load DataTypeDefinitions from the server at runtime
  • pubsub: Support for manual de/encoding of PubSub messages
  • pubsub: Custom state machine for PubSubComponents to integrate communication backends
  • pubsub: Public API to compute offset tables for fixed Network-/DataSetMessages
  • pubsub: Improved loading of PubSub configurations from a (binary) file
  • pubsub: Initial support for SKS
  • nodeset-compiler: Use the native XML decoding to parse attributes at runtime
  • util: Query language (and parser) for EventFilter, RelativePath, etc.
  • util: Convert DataTypeDefinition into UA_DataType (internal representation)
  • eventloop: EventLoop can be cancelled to immediately return from a "poll-sleep"
  • eventloop: Option to limit the number of sockets open at the same time
  • eventloop: Support for lwip-based EventLoop
  • plugins: Crypto PKI/SecurityGroup with a file-system storage backend
  • plugins: Support for ECC-based SecurityPolicies (OpenSSL only)
  • tools: "Shell mode" for the ua-cli terminal client

 

Dr. Julius Pfrommer

General Manager | o6 Automation GmbH

Rintheimer Straße 23, 76131 Karlsruhe

Web: https://www.o6-automation.com

Mail: julius....@o6-automation.com

 

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