Erlang OPCUA Roadmap

OPCUA Protocol

OCUA Codec

• Add support for OptionSet length different than 32 bits. https://reference.opcfoundation.org/Core/Part3/v105/docs/8.40
• Add support for subtypes in structures and union fields. https://reference.opcfoundation.org/Core/Part3/v105/docs/8.49

UACP

• Add support for browse continuations (and BrowseNext).
• Enforce block and buffer sizes.
• Support browse filtering, and result fields configuration.
• Enforce a maximum number of inflight requests, maximum chunck size and maximum message size.
• Enforce that channel_open messages cannot be chuncked.
• Add support for reverse connection (ReverseHello).

OPCUA NodeSet

OPCUA Parser

• Fix the namspaces indexing when multiple nodesets have diferent sets of namespaces.
• Make the aliases local to a nodespace definition.
• Properly parse XML formated values from standard nodeset XML files; e.g. Variables like EnumValues (i#15633) should have a value.
• Make the parser generate data type definition as they would be formated when requesting the attribute from a remote server.
• When opcua_space is able to maintain all the index and schemas dynamically, use a temporary instance of it to load all the parsed data and persiste it as a cache.

OPCUA Space

• Move the is_subtype index from opcua_space_backend to opcua_space, so the backend is only responsible for storage.
• Dynamically generate codec schemas from adding data type nodes in a space.
• Use EnumValues, EnumFields, EnumStrings, OptionSetValues, and OptionsSetLength to generate missing data type definition, validate existing definition, and complete with extra information (description...).
• Add consistency checks to space manipulation to prevent any state explicitly forbidden in the standard.
• Add support for NodeVersion. Change the version of the node poroperty when adding or removing references. This must be optional, to be able to use a space as a cache of the server space in a client.
• Add support for delegation, validation and notification; Any operation may be delegated to a registered actor (a service for example), that must allow the operation, and get notified on the applied operations. This should be used to interconnect services, e.g. the service that provide a client with node manipulation, and another service that apply side-effects from nodes being created.

OPCUA Security

• EC keys support
• x509 identity Token
• Certificate revocation lists (CRL)

OPCUA Client

• When space is updated to dynamically generate codec schemas, react to codec errors due to missing type information by dynamically retriving the types from the server.
• Add support for method calls.

OPCUA Server

• Make node managment plugable, so multiple application could handle there own part of the node graph.
• Add support for method calls.
• Add node management service.

OPCUA PubSub

• PubSub comunication protocol
• PubSub informational model

Generic

Consistency and Validation Checks

• Client and server should check time synchronization (default: max 5 min)

Security

• Add support for role managment, authentication and access control.
• Verify we are enforcing the buffer size restriction correctly