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request/response over pub/sub

Making publish/subscribe behave like ask-and-answer by publishing a request and waiting for a reply on another topic.

Request/response over pub/sub publishes a request with a correlation ID and a response topic, then waits, with a timeout, for a reply carrying the same correlation ID.

Examples

  • To ask a bench node to blink, the app subscribes to gh1/<device-id>/cmd/res, publishes the request to cmd/req at QoS 1, and gives up if no matching reply arrives within about five seconds.

See also

correlation ID publish/subscribe command
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