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mosquitto_sub — A simple MQTT version 3.1.1 client that will subscribe to topics and print the messages that it rece

Submitted by: @import:tldr-pages·Mar 2, 2026·

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simplecommandclientmosquitto_submqttclithatversion

Problem

How to use the mosquitto_sub command: A simple MQTT version 3.1.1 client that will subscribe to topics and print the messages that it receives. More information: <https://mosquitto.org/man/mosquitto_sub-1.html>.

Solution

mosquitto_sub — A simple MQTT version 3.1.1 client that will subscribe to topics and print the messages that it receives. More information: <https://mosquitto.org/man/mosquitto_sub-1.html>.

Subscribe to the topic sensors/temperature information with Quality of Service (QoS) set to 1. (The default hostname is localhost and port 1883):

mosquitto_sub {{[-t|--topic]}} {{sensors/temperature}} {{[-q|--qos]}} {{1}}

Subscribe to all broker status messages publishing on iot.eclipse.org port 1885 and print published messages verbosely:

mosquitto_sub {{[-v|--verbose]}} {{[-h|--host]}} "iot.eclipse.org" {{[-p|--port]}} 1885 {{[-t|--topic]}} {{\$SYS/#}}

Subscribe to multiple topics matching a given pattern. (+ takes any metric name):

mosquitto_sub {{[-t|--topic]}} {{sensors/machines/+/temperature/+}}

Code Snippets

Subscribe to the topic `sensors/temperature` information with Quality of Service (`QoS`) set to 1. (The default hostname is `localhost` and port 1883)

mosquitto_sub {{[-t|--topic]}} {{sensors/temperature}} {{[-q|--qos]}} {{1}}

Subscribe to all broker status messages publishing on `iot.eclipse.org` port 1885 and print published messages verbosely

mosquitto_sub {{[-v|--verbose]}} {{[-h|--host]}} "iot.eclipse.org" {{[-p|--port]}} 1885 {{[-t|--topic]}} {{\$SYS/#}}

Subscribe to multiple topics matching a given pattern. (+ takes any metric name)

mosquitto_sub {{[-t|--topic]}} {{sensors/machines/+/temperature/+}}

Context

tldr-pages: common/mosquitto_sub

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