mosquitto_rr doesn't actually support v3.1.1

[Arnavion]

A command like:

mosquitto_rr ... --topic ... --message ... -e ... --protocol-version mqttv311

will use the value of -e (cfg.response_topic) both for subscribing to (okay) and as properties of the PUBLISH message (not okay). This means mosquitto_publish_v5 fails with MOSQ_ERR_NOT_SUPPORTED.

On a related note, the response topic is parsed as a publish topic rather than a subscription topic, which is correct for v5. But for v3.1.1 it's more convenient to parse it as a subscription topic to allow wildcards.

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Incidentally the man page doesn't document the -e parameter. It's mentioned in the synopsis section but not in the options section. Even the synopsis section incorrectly marks it as an optional parameter and groups it within the {} group that contains the -h and -L alternatives.

[ralight]

Thank you, that's a good description. It's now fixed, although I disagree with you about the response topic. It would be harder to use in v3.1.1 certainly, but changing to allow wildcards in the response topic doesn't feel right.

[Arnavion]

Thanks for the fix.