RTI Connext C# API  6.1.0
Release Notes

Major performance improvements for high throughput

This release includes a few performance improvements that drastically increase the maximum throughput that can be achieved with the Connext DDS C# API.

Note also that our internal testing shows that .NET 5 provides far better performance than previous .NET versions such as .NET Core 3.1 or .NET Framework 4.6.1.

Issue reference: CORE-11560

How to upgrade to This release is available on nuget.org. To upgrade, edit your .csproj files and replace Version="6.1.0" with Version="", use the Visual Studio NuGet package manager, or run the following command in the directory where your .csproj is to get the latest version:

dotnet add package Rti.ConnextDds.Extra

(Don't add .Extra to the package name if you're using .NET Core 2.x or .NET Framework.)


RTI Connext 6.1.0 is the first release of this new C# API, which will replace the legacy .NET C++/CLI and C# API.

Supported Platforms

The Connext DDS C# API is supported on .NET Standard 2.0 systems, including .NET 5 (and newer), .NET Core 2.1, .NET Core 3.1, .NET Framework 4.6.1, Unity 2018.1.

It runs on Windows®, Linux® and macOS® platforms. It has been tested on the following systems:

  • Windows 10 (x64)
  • Windows 8, server 2012 R2 (x64)
  • CentOS™ 6.0, 6.2-6.4, 7.0 (x64)
  • Red Hat® Enterprise Linux 6.0-6.5, 6.7, 6.8, 7, 7.3, 7.5, 7.6, 8 (x64)
  • SUSE® Linux Enterprise Server 12 SP2 (x64)
  • Ubuntu® 14.04, 16.04, 18.04, 20.04 LTS (x64)
  • Ubuntu 16.04, 18.04 LTS (64-bit Arm® v8)
mac OS
  • macOS 10.15 (x64)


The Connext DDS C# API has three components: The Rti.ConnextDds NuGet package contains most of the API and is compatible with .NET Standard 2.0. The Rti.ConnextDds.Extra NuGet package adds a few utilities that require .NET Standard 2.1 compatibility (.NET Core 3.1, .NET 5, or newer). C# support for the IDL and XML code generator, rtiddsgen.

The NuGet packages can be obtained from nuget.org (they require a license file) or with an RTI installer. The code generator support is only available with the RTI installer.

See the Getting Started Guide to install the Connext DDS C# API and build and run your first application.

If you had access to a preview release, you may need to clear your NuGet cache:

> dotnet nuget locals all -c

To work with Unity, see this tutorial.

Limitations in this release

RTI Connext DDS 6.1.0 is the first release of this API. This release has a few limitations that will be resolved in upcoming releases.

Limitations related to the Connext DDS API

Limitations related to the IDL-to-C# code generation

Other limitations

Legacy .NET API

The previous .NET API and IDL binding to C++/CLI is deprecated since 6.1.0 and will be removed in a future version and replaced with this new C# API and C# IDL binding.

The default RTI Connext Professional 6.1.0 installation still contains the legacy API. To use the this new API you have to install an additional package.

The 6.1.0 migration guide provides useful information for developers of the legacy .NET API.

Third Party Software

.NET Core 3.1