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CHANGELOG.md

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Changelog

ASPIRATIONAL - a short list of things that would be nice to implement

  • Fix subscription publish lost notifications
  • Diagnostics
  • Session restore after disconnect in server
  • Session restore after disconnect in client
  • More security / validation / enforcement around client certs that do not match app descriptions or DNS info
  • Replace openssl for ring + x509 for more (but not total) rust implementation
  • Use tokio client side. The problem here is that synchronous calls are far easier to work with, and how to make it work with tokio under the covers.

0.4 (IN PROGRESS)

  • General
    • More rigorous security checks
  • Client side
    • Add client side encryption for security policies & modes other than None
    • Simple-client sample takes arguments to change what config to read and to set which endpoint to use.
    • Moved discovery / endpoints / connection into a helper to save writing that in every client
    • (IN PROGRESS) Better failure behaviour when server goes down or becomes unreachable
  • Server side
    • If discovery_server_url property is set in the config the server shall attempt to periodically register itself with a discovery server. Note that the server uses the strongest endpoint to talk to the discovery server so you might have to do some work in the ds pki dir to ensure your server is trusted.
    • The server network IO is rewritten using tokio and futures. Sessions move from being a thread each with its own synchronous IO to sharing threads and asynchronous IO. It should be more scalable. The downside is writing asynchronous code is a steep learning curve.
    • Setting timers to poll/change values is simplified and uses tokio behind the covers. This should also be more efficient.
    • The server provides a basic web api which can be enabled through code. See the demo_server/ sample which starts a server on localhost:8585
    • Finer grained locking around some structures where only read access is required

0.3

  • General
    • Numerous enhancements
    • Replace a lot of conventional loops with iterators using filter, find, map, collect etc.
    • More impls of From<> and Into<> traits, replacing proprietary functions
    • Reduce the amount of imports by refactoring code, moving types to their own files
  • Core and types
    • StatusCode values have switched naming convention from BAD_UNEXPECTED to BadUnexpected
    • Code generation produce nicer output with less unused imports
    • Generated types now go into types/src/service_types
    • Security channel code is more server / client agnostic
    • Crypto cert generator inserts a random serial # value which some 3rd party OPC impls check for
    • Implement NumericRange
    • Simplify implementation of DateTime
    • Simplify implementation of Guid
    • Fix some issues with numeric node ids serialization. Implement binary node ids
  • Client side
    • Add client side helpers that call most services implemented server side
    • Add a discovery api
    • Add configuration file support
    • Add subscription and monitored items support
    • A lot of work to get crypto working client side (but its not there yet)
  • Server side
    • Better implementation of subscription / monitored item.
    • Implement Republish
    • Revised config file format to more cleanly support different token types
    • Changes to how locks are held on major components like address space, server, session
    • Partial impl of discovery server
    • Partial impl of diagnostics
  • Samples
    • simple-client now has a --subscribe arg to exercise new subscription APIs
    • New sample discovery-client demonstrates a client which calls a discovery server
    • New sample demo-server tests all standard OPC UA variant types. It will grow to add more in time.
    • Some http server stubbing done to allow metrics to be published. Not functional.

0.2

  • server side crypto / pki architecture
  • Implements service calls that were stubbed or partially implemented in 0.1.
  • New sample chess-server
  • Improved test cases
  • Refactor code to reduce build times.

0.1 initial release

  • Nano implementation