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There's also a simplified version of the Reactive IoT backend app at https://github.com/lhotari/reactive-iot-backend-ApacheCon2021 . I also upgraded that to use latest Spring Boot version, Spring Pulsar and Pulsar Reactive Client. Simple Server Sent Event (SSE) controller, fine for demos (resuming support is what makes the code more complicated as shown in the other example): https://github.com/lhotari/reactive-iot-backend-ApacheCon2021/blob/master/src/main[…]/github/lhotari/reactiveiotbackend/EventFireHoseController.java The simplified ingest controller: https://github.com/lhotari/reactive-iot-backend-ApacheCon2021/blob/master/src/main/java/com/github/lhotari/reactiveiotbackend/IngestController.java