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MQTT
A plain "GET" subscribes to the topic and prints all published messages. Doing a "POST" publishes the post data to the topic and exits.
Subscribe to the temperature in the "home/bedroom" subject published by example.com:
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curl mqtt://example.com/home/bedroom/temp
Copied!
Send the value '75' to the "home/bedroom/dimmer" subject hosted by the example.com server:
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curl -d 75 mqtt://example.com/home/bedroom/dimmer
Copied!

What does curl deliver as a response to a subscribe

It outputs two bytes topic length (MSB | LSB), the topic followed by the payload.

Caveats

Remaining limitations in curl's MQTT support as of September 2020:
    No username support
    Only QoS level 0 is implemented for publish
    No way to set retain flag for publish
    No username/password support
    No TLS (mqtts) support
Last modified 1yr ago