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I've used WS client for a POC on ReactJS

Hmm, I wasnt sure how to set up a websocket reader that allowed you to do time seeking of messages to play back events: https://pulsar.apache.org/docs/3.0.x/client-libraries-websocket/#reader-endpoint It looks like you connect just like a consumer. Did you manage to do any message seeking?

All I did was listen for messages and send an ACK and then display message on the UI

Fair enough 🙂