This demo has two scenes. One for master and one for client. Drag and drop each scene to hierarchy panel.
This scene has --CONNECTION_TO_MASTER, described here and some UIs. ClientConnectionStatusView shows status of connection and username if user is authorized. See BasicAuthorization demo.
This scene has --MASTER_SERVER, described here with basic modules.
Start Play mode and see how it works. You can also see MST status in web browser. Open http://127.0.0.1:5056/, and use admin as login and admin as password