This repository is a simple Unreal project giving an example to use the UnrealRosPlugin in the Unreal Engine side.
Everything concerning ROS is located in the RosCube Blueprint, in the RosSerialClient.cpp file and its header.
Take a look at the SimpleROSProjectForUnreal repository. It gives an example for the ROS side.
Double click on RosSimpleProject.uproject file to build and launch the project.
In the ROSCube blueprint, don't forget to modify the IP Adress of your RosMaster