[manigandham]

NATS is a purely pub/sub system. It has no persistence or messaging queuing semantics outside of a "queue group" which is a simple round robin delivery of messages sent to a topic.

[piotrkubisa]

Note: There is NATS streaming [1] which implements persistence and redelivery.

[1]: http://nats.io/documentation/streaming/nats-streaming-intro/

[2]: https://github.com/nats-io/nats-streaming-server