1<!-- 2Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3 4SPDX-License-Identifier: curl 5--> 6 7# MQTT in curl 8 9## Usage 10 11A plain "GET" subscribes to the topic and prints all published messages. 12Doing a "POST" publishes the post data to the topic and exits. 13 14Example subscribe: 15 16 curl mqtt://host.home/bedroom/temp 17 18Example publish: 19 20 curl -d 75 mqtt://host.home/bedroom/dimmer 21 22## What does curl deliver as a response to a subscribe 23 24It outputs two bytes topic length (MSB | LSB), the topic followed by the 25payload. 26 27## Caveats 28 29Remaining limitations: 30 - Only QoS level 0 is implemented for publish 31 - No way to set retain flag for publish 32 - No TLS (mqtts) support 33 - Naive EAGAIN handling does not handle split messages 34
