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Official OPC UA .Net Standard Samples from the OPC Foundation

Help wanted!

The samples in this repository are hosted by the OPC Foundation to keep the sample code available for the community.

However, to avoid internal competition with OPC members that offer commercial SDKs, the OPC Foundation limits its own resources for maintenance and support to a minimum.

Contributions of the community to improve and maintain the samples and to help with issues to keep this repository alive are very welcome.

Please follow the steps outlined here to start contributing.

Overview

Sample Servers and Clients, including all required controls, for .NET Framework 4.6.2, .NET Core 2.0 and UWP.

Integrates the offical OPC UA NuGet package containing the OPC UA reference implementation targeting .NET Standard.

.Net Standard allows you develop apps that run on all common platforms available today, including Linux, iOS, Android (via Xamarin) and Windows 7/8/8.1/10 (including embedded/IoT editions) without requiring platform-specific modifications. Furthermore, cloud applications and services (such as ASP.Net, DNX, Azure Websites, Azure Webjobs, Azure Nano Server and Azure Service Fabric) are also supported.

For more information and license terms, see here.

Features included

1. Sample Servers and Clients, including all required controls, for .NET 4.6.2, .NET Core >= 2.1, and UWP.
2. Sessions (including UI support in the samples).
3. Subscriptions (including UI support in the samples).
4. OPC UA Aggregation Server.
5. OPC Classic adapter for OPC UA. (Removed in 12/2024)
6. OPC UA Global Discovery Client and Global Discovery Server.
7. OPC UA Xamarin Client. (Removed in 12/2024)
8. OPC UA Quickstart Samples.
9. The Core UA stack and SDK has been tested with Mono 5.4 to add support for the Xamarin Client and the Mono console application samples. (Removed as of 12/2024)

Project Information

General Project Info

Build Status

Getting Started

All the tools you need for .Net Standard come with the .Net Core tools. See here for what you need.

Debugging the Opc.Ua.Core Nuget packages

Since Nuget version 1.4.363.107 there is support for symbol snupkg packages on Nuget.Org and github source link.

• See devblog for more information on how to setup the debug symbol server.
• Support for Sourcelink for integrated source code debugging experience.

Self signed certificates for the sample applications

All required application certificates for OPC UA are created at the first start of each application in a directory or OS-level certificate store and remain in use until deleted from the store.

Windows .Net applications

By default the self signed certificates are stored in a X509Store called CurrentUser\UA_MachineDefault. The certificates can be viewed or deleted with the Windows Certificate Management Console (certmgr.msc). The trusted, issuer and rejected stores remain in a folder called OPC Foundation\CertificateStores with a root folder which is specified by the SpecialFolder variable %CommonApplicationData%. On Windows 7/8/8.1/10 this is usually the invisible folder C:\ProgramData.

Note: Since the sample applications in the UA-.Net repository use the same storage and application names as UA-.NetStandard, but create only certificates with hostname localhost, it is recommended to delete all existing certificates in MachineDefault to recreate proper certificates for all sample applications when moving to the UA-.NetStandard repository.

Windows UWP applications

By default the self signed certificates are stored in a X509Store called CurrentUser\UA_MachineDefault. The certificates can be viewed or deleted with the Windows Certificate Management Console (certmgr.msc).

The trusted, issuer and rejected stores remain in a folder called OPC Foundation\CertificateStores in the LocalState folder of the installed universal windows package. Deleting the application state also deletes the certificate stores.

.Net Standard Console applications on Windows, Linux, iOS etc.

The self signed certificates are stored in a folder called OPC Foundation/CertificateStores/MachineDefault with a root folder which is specified by the SpecialFolder variable %LocalApplicationData% or in a X509Store called CurrentUser\My, depending on the configuration. For best cross platform support the personal store CurrentUser\My was chosen to support all platforms with the same configuration. Some platforms, like macOS, do not support arbitrary certificate stores.

The trusted, issuer and rejected stores remain in a shared folder called OPC Foundation\CertificateStores with a root folder specified by the SpecialFolder variable %LocalApplicationData%. Depending on the target platform, this folder maps to a hidden locations under the user home directory.

Local Discovery Server

By default all sample applications are configured to register with a Local Discovery Server (LDS). A reference implementation of a LDS for Windows can be downloaded here. To setup trust with the LDS the certificates need to be exchanged or registration will fail.

How to build and run the samples in Visual Studio on Windows

1. Open the UA Sample Applications.sln solution file using Visual Studio 2017.
2. Choose a project in the Solution Explorer and set it with a right click as Startup Project.
3. Hit F5 to build and execute the sample.

How to build and run the console samples on Windows, Linux and iOS

This section describes how to run the NetCoreConsoleClient and NetCoreConsoleServer sample applications.

Please follow instructions in this article to setup the dotnet command line environment for your platform. As of today .Net Standard 2.0 is required.

Prerequisites

1. Once the dotnet command is available, navigate to the root folder in your local copy of the repository and execute dotnet restore UA Sample Applications.sln. This command calls into NuGet to restore the tree of dependencies.

Start the server

1. Open a command prompt.
2. Navigate to the folder Samples/NetCoreConsoleServer.
3. To run the server sample type dotnet run --project NetCoreConsoleServer.csproj -a.
   • The server is now running and waiting for connections.
   • The -a flag allows to auto accept unknown certificates and should only be used to simplify testing.

Start the client

1. Open a command prompt
2. Navigate to the folder Samples/NetCoreConsoleClient.
3. To run the sample type dotnet run --project NetCoreConsoleClient.csproj -a to connect to the OPC UA console sample server running on the same host.
   • The -a flag allows to auto accept unknown certificates and should only be used to simplify testing.
   • To connect to another OPC UA server specify the server as first argument and type e.g. dotnet run --project NetCoreConsoleClient.csproj -a opc.tcp://myserver:51210/UA/SampleServer.
4. If not using the -a auto accept option, on first connection, or after certificates were renewed, the server may have refused the client certificate. Check the server and client folder %LocalApplicationData%/OPC Foundation/CertificateStores/RejectedCertificates for rejected certificates. To approve a certificate copy it to the %LocalApplicationData%/OPC Foundation/CertificateStores/UA Applications folder.
5. Retry step 3 to connect using a secure connection.

How to build and run the OPC UA COM Server Wrapper (Removed as of 12/2024)

How to build and run the OPC UA Aggregation Client and Server

• Please refer to the OPC Foundation UA .Net Standard Library Aggregation Client and Server for a detailed description how to run the aggregation client and server.

How to build and run the OPC UA Xamarin Client (Removed as of 12/2024)

Contributing

We strongly encourage community participation and contribution to this project. First, please fork the repository and commit your changes there. Once happy with your changes you can generate a 'pull request'.

You must agree to the contributor license agreement before we can accept your changes. The CLA and "I AGREE" button is automatically displayed when you perform the pull request. You can preview CLA here.