Does RTI Connext DDS support Hololens 1or2 development?

So, from what I can tell, Hololens 1 uses a modified Windows 10 on an Intel Atom processor.  Since Windows on Intel is a supported platform for RTI Connext DDS, i.e., there are libraries that work on that OS/CPU combination, then theoretically, you can run applications that use DDS on that.  However, to use Unity, you would need to use RTI Connector in order to program in C#.  The existing C# API for RTI Connext DDS doesn't work in Unity, but RTI is creating and releasing a .NET Core-based C# API that will work with Unity sometime at the end of the year, beginning of 2021.  Right now, you would have to use the experimental/unsupported RTI Connector service that you could download from Github (still requires RTI Connext DDS under the hood).

As for Hololens 2....Microsoft changed the CPU from Intel to an ARM-based CPU (Qualcom's Snapdragon).  However, RTI does not currently support Windows on ARM...in which case, you would not be able to run RTI Connext DDS on Hololens 2 at this time.

Finally, RTI Connext DDS is a commercial product.  While you can get a 30-day evaluation license to try out RTI Connext DDS, if you are using it in a project, you will need to get a commercial license.  You can get a download of RTI Connext DDS and 30-day evaluation license by going to https://www.rti.com/free-trial.

RTI does also offer RTI Connext DDS Micro which is a source-code product and theoretically could be compiled by the user for any OS/CPU.  However, Connext Micro does not have a C# API.  You would have to program in C or C++ and create a custom C# wrapper to use in Unity.  Connext Micro is also a licensed product and you would have to have a commercial project to get an evaluation.  Please contact sales@rti.com if you're interested.