Very similar to Sensor Ingestion Akka REST Service just reading from Kafka instead of writing.
Would be nice to provide a WebSocket such that clients can read indirectly the Kafka stream - but for now, they have to poll to get the most recent data from the service with no guarantee that they received all data (no gaps) or didn't see the same data multiple times.
For now, it is mainly a tool for debugging - to get relatively easy a feedback whether data send to the Sensor Ingestion REST Service really gets stored properly in Kafka.