Thanks for your interest in the AeroGear project!
For the first look on the project, you can just launch the AeroGear UPS on OpenShift. Follow this guide  and just press the button "Launch on OpenShift". You will be able to set up the server really quickly. Go to the admin panel and try to make basic settings for a new app/device. The Docker container is also a good opportunity to run it quickly. It's up to you.
When you will be ready to go deeper, to the source code, try to clone the repository and follow the next guide . It contains a good explanation of the main UPS workflow. You will be able to set up and configure everything that you need to run the UPS (WildFly/database/message queue/etc.). If you will have any specific questions or problems when you will follow this guides, ask them here.
Also try to explore the AeroGear website, it contains a lot of interesting materials. Enjoy your work on this project!