A websockets example is present under the "Chat" menu item in the DrawerContent. To enable this in your JHipster backend, Ignite JHipster made the following changes to your JHipster app's WebsocketConfiguration.java:
src/main/java/.../config/WebsocketConfiguration.java
-registry.addEndpoint("/websocket/tracker")
+registry.addEndpoint("/websocket/tracker", "/websocket/chat")
The default JHipster websockets configuration requires users to authenticate before connecting.
For a more advanced websockets example, see the tracker.service.ts and ActivityService.java in the generated JHipster webapp.