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This is the in-depth documentation about the OPC UA implementation in Rust.

Setup

OPC UA for Rust generally requires the most recent stable version of Rust to compile. The recommendation is to install rustup to manage your toolchain and keep it up to date.

Windows

Rust supports two compiler backends - gcc or MSVC, the choice of which is up to you. If you choose the MSVC then you must either build OpenSSL for yourself or use a prebuilt binary.

Visual Studio

  1. Install Microsoft Visual Studio. You must install C++ and 64-bit platform support.
  2. Use rustup to install the install stable-x86_64-pc-windows-msvc during setup or by typing rustup toolchain install stable-x86_64-pc-windows-msvc from the command line.
  3. If you choose to use a prebuilt-binary, download and install OpenSSL 64-bit binaries, e.g. from https://slproweb.com/products/Win32OpenSSL.html.
  4. Set an environment variable OPENSSL_DIR to point to the installation location, e.g. C:\OpenSSL-Win64

Also if you chose not to copy the OpenSSL binaries to your Windows directory, you must ensure that %OPENSSL_DIR%\bin is on your PATH.

set PATH=%PATH%;%OPENSSL_DIR%\bin

32-bit builds should also work by using the 32-bit toolchain and OpenSSL but this is unsupported.

MSYS2

MSYS2 is a Unix style build environment for Windows.

  1. Install MSYS2 64-bit
  2. Update all the packages pacman -Syuu
  3. pacman -S gcc mingw-w64-x86_64-gcc mingw-w64-x86_64-gdb mingw-w64-x86_64-pkg-config openssl openssl-devel pkg-config
  4. Use rustup to install the stable-x86_64-pc-windows-gnu toolchain during setup or by typing rustup toolchain install stable-x86_64-pc-windows-gnu from the command line.

You should use the MSYS2/MingW64 Shell. You may have to tweak your .bashrc to ensure that the bin/ folders for both Rust and MinGW64 binaries are on your PATH.

Linux

These instructions apply for apt-get but if you use DNF on a RedHat / Fedora system then substitute the equivalent packages and syntax using dnf.

  1. Install gcc and OpenSSL development libs & headers, e.g. sudo apt-get gcc libssl-dev.
  2. Use rustup to install the latest stable rust during setup.

Package names may vary by dist but as you can see there isn't much to setup.

OpenSSL

The major external dependency is OpenSSL. If you have trouble building the openssl-* crates or trouble running them then refer to that project's documentation.

Vendored OpenSSL

The openssl crate has a vendored feature that can fetch, build and statically link to a copy of OpenSSL without it being in your environment.

This might be useful for cross-compiling. OPC UA for Rust exposes the feature as vendored-openssl which is on the opcua-core, opcua-server and opcua-client crates. i.e. when you specify --features=vendored-openssl it will pass vendored through to the openssl crate.

Note that Rust OPC UA is just passing through this feature so refer to the openssl documentation for any issues and troubleshooting required to use it.

Conditional compilation

The OPC UA server crate also provides some other features that you may or may not want to enable:

  • generated-address-space - When enabled (default is enabled), the AddressSpace::new() will create and populate the address space with the default OPC UA node set. When disabled, the address space will only contain a root node, thus saving memory and also some disk footprint.
  • discovery-server-registration - When enabled (default is disabled), the server will periodically attempt to register itself with a local discovery server. The server will use the on the client crate which requires more memory.
  • http - When enabled (default disabled), the server can start an HTTP server (see demo-server) providing diagnostic and metrics information about how many active connections there are, what they're monitoring as well as the internal health of the server. This is useful for development and debugging. Enabling the http server adds dependencies on actix-web and requires more memory.

Workspace Layout

OPC UA for Rust follows the normal Rust conventions. There is a Cargo.toml per module that you may use to build the module and all dependencies. e.g.

$ cd opcua/samples/demo-server
$ cargo build

There is also a workspace Cargo.toml from the root directory. You may also build the entire workspace like so:

$ cd opcua
$ cargo build