niobe/third_party/curl/docs/MQTT.md

MQTT in curl

Usage

A plain "GET" subscribes to the topic and prints all published messages. Doing a "POST" publishes the post data to the topic and exits.

Example subscribe:

curl mqtt://host/home/bedroom/temp

Example publish:

curl -d 75 mqtt://host/home/bedroom/dimmer

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:

• 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
• Naive EAGAIN handling won't handle split messages