Open-source OPC UA client and server library for .NET Framework and .NET Core based on IEC 62541. Available a library, a demo client and a demo server. Tested and commercially used in industrial applications with commercial vendors' UA servers and clients.
Available as a nuget package for .NET Core (1.0.52): https://www.nuget.org/packages/nauful-LibUA-core
- Fully supported OPC UA core client and OPC UA server specification.
- OPC UA binary protocol with chunking.
- Security profiles None, Basic128Rsa15, Basic256, Basic256Sha256, Aes128Sha256RsaOaep (.NET Standard only) and Aes256Sha256RsaPss (.NET Standard only).
- Optimized memory buffers for encoding/decoding large and complex structures to/from raw bytes.
- Support for all message types, node types, and default address space from the UA specification.
- Support for signing and encrypted security profiles.
- Anonymous, user/pass and certificate authentication.
- Sessions, subscriptions (data change notifications and custom notifications), custom events and alarming.
- Extendable server address space with hooks for client requests for access control, read handlers, write handlers, etc.
- Support for reads, writes, updates, historical data and aggregation.
- Server instances have low overhead: tested with hundreds of clients performing simultaneous historical reads, data change notification subscriptions and real-time writes.
Standard Apache License 2.0.
- Permissions: Free for commercial use, modification, distribution, patent use and private use.
- Conditions: Credit must be given to this github repository/owner, license and copyright notice, state changes.
- Limitations: No trademark use, no liability, no warranty.
The demo client and server applications can create self-signed certificates with sufficient fields for most usage. Remember to move these to the trusted directory on a server when connecting to a server for the first time.