Ongoing Work, Feature Wishlist and Prioritization

[jpfr]

This meta-issue collects ongoing work to keep on overview on the many work items.
Please add your comment and detailed discussions below in the thread.
This first thread-entry is updated to reflect the current state of the ongoing work.

Latest changes

• v1.4.1 patch release
• v1.3.11 patch release
• Official certification of the 1.4 branch (99% complete)
• Socket reuse again the default
• Use the same type for the PublisherId everywhere

Ongoing Work

• Prepare for interaction with GDS push
  • [WIP] Add GDS push management functionality to the information model #6515
  • [REVIEW] Implement filestore backend for certificate groups #6479
  • [REVIEW] Interface definition for gds push management #6274 Rework the certificate handling and endpoint infrastructure (preparation for GDS)
• EventLoop
  • [REVIEW] Integrate libwebsockets library #5683 Merge libwebsockets library for the EventLoop (HTTP/MQTT/Websocket)
  • Implement WebSocket based on libwebsockets
  • Switch MQTT support based on libwebsockets
  • Implement async DNS resolution to make EventLoop fully non-blocking
• Role-based Access Control #6521
  • Build upon [WIP]feat: OPC UA Role Permissions #6149
• feat(server) Extended Asynchronous Operations (Read + Write of Variables) #6220 Asynchronous Reads/Writes
  • Analogous to async method execution
  • Use case: Fieldbus backend with a delay
  • PR for master in the next months -- after v1.4
• [REVIEW] Correct setting of the namespaceIndex #6523

PR Housekeeping

• PubSub-Publishing of Events
  • PR [WIP] feat(pubsub): Publishing of Events #4220 was abandonded, needs a final push
• [Review] Permit CreateMonitoredItem service for hidden nodes/statuscode BadNodeIdUnknown #4603 MonitoredItems for Nodes that are sometimes hidden
  • Make the behavior configurable in the server config
  • @mlang-de is interested in the feature
• [WIP] Fix/vs2019 no unit tests x86 #5051 [WIP] Visual Studio 64bit builds
  • Trigger Jan on the Status
• [REVIEW] LDS-ME IPV6 support in Open62541 #5121 IPv6 multicast discovery (linutronix)
  • Next step: Move to the upstream mdnsd
• Nodeset resolver Tool (for generating custom tailored namespace-zero nodesets) #4647 NodeSet Compiler
  • Whitelist node selection for the Nodeset Compiler
    • Backwards chaining to include all dependencies
    • Use this to create the ReducedNodeSet2.xml from a whitelist
  • Going to replace the "reduced namespace zero" with a whitelist-based approach
• FreeRTOS and lwip WIP: feature(arch): Build system integration for ARM architecture #6384

Major open issues:

• Error BadSecurityChecksFailed even added UA Expert's Certificate #6018, also in OPC UA Server: Accept client application instance certificate based on trusted issuer list #6152
  • @IOSB add a unit test, solve as part of the GDS push
• Partially resolved: PubSub option for maximum string length
  • If the length is fixed we need to fill up with zero-bytes
  • Partially resolved: Works for strings/bytestrings but not if wrapped inside a structure
  • @andreasebner Add warnings to remove as "major issue"
• Fix nodeset compiler issues to integrate "all" companion specs into the CI build
  • @NoelGraf add the list of outstanding companion spec issues to the Nodeset-Compiler readme
  • Goal: Support all official companion specs
  • Todo: Support datatype format extraction from the nodeset xml.
    • This depends on the full XML decoding.
• FreeRTOS port on v1.4 @jayanthvelu
  • FreeRTOS / lwip and FreeRTOS+TCP

Feature Wishlist

• PubSub Encryption support for OpenSSL #5601, right now only mbedTLS
• Architecture Support
  • Add a table with the status of the different architectures
  • Show differences between 1.3 and 1.4.
  • Add more architecture for the EventLoop model
• ROM-based Binary Nodestore
  • Reduce RAM requirements
  • First implementation in [Draft] ROM-based Nodestore implementation #3411
  • Work item for the LoI 5
• Diagnostics and auditing
  • Diagnostics Object in the Server
  • Diagnostic/Auditing metadata returned for the services
    • Used by the IOLink CS (optional)
    • Used by the Global Discovery Server
  • PubSub diagnostics
• Reduce memory consumption and copying for chunking
  • Currently, enough space for the entire message is allocated
  • Use mmap / MMU to “virtually assemble” the message
• Decryption of chunks in worker threads
• The bsd file format for the DataType definitions is obsolete
  • DataType definitions directly in nodeset xml
  • SIOME does no longer support the old bsd file format
  • Possible work item for LoI 5
• Support for Views How to create an OPC UA View? #5556
• Implement outstanding services
  • Query
    • SQL-like language for query expressions
• Storing Historical Timeseries on disk
  • Can fork / extend the backend for historical data by BasysKom
• Runtime use of dynamic memory allocation for Events
  • 1. Use a data source for the node that is not allocating
  • 2. Memory-arena for the server-side subscription
• Client-Server Security with TPM
  • Store keys in the TPM
  • Also do encryption inside the TPM?
• [Review] PubSub: Publishing offset parameter support #3981 Publisher Offset PR (Kalycito)
  • Needs refactoring for the master branch
• Interface for batch update of PubSub-configuration
• Append to existing PubSub configuration (9.1.3.7 -> PubSubConfigurationType)
• Support ExtensionObjects with fields that are multidimensional arrays
  • Latest changes in the spec
• Parsing of XML configuration per the standard annex
  • Translate to our JSON-based configuration
  • The standard only defines the security configuration per XML
• Driver API for backend system integration
  • First example: "File" driver
  • Set up a repository of device drivers mapping into OPC UA objects
• Nodeset loader
  • Full XML DataType De/Encoding still outstanding (Variant, ExtensionObject)

[andreasebner]

Please add the "PubSub-Configuration Batch update". This means we offer one information model method which accepts the PubSubConfigurationType (9.1.3.7). This type contains the whole PubSub-config which can overwrite (simpler) or update (complex) the current configuration.

[basyskom-meerkoetter]

@jpfr & @andreasebner the "[REVIEW] Locale ids support in the server #4165 Localization Support in the server" can be marked checked. It has been merged.

[matkonnerth]

I am interested in the query service, here is some work I've done with cypher query language and opcua: https://github.com/matkonnerth/query4Opc