$ sudo dnf install mosquitto

$ sudo nano /etc/mosquitto/mosquitto.conf

# Config file for mosquitto
#
# See mosquitto.conf(5) for more information.
#
# Default values are shown, uncomment to change.
#
# Use the # character to indicate a comment, but only if it is the
# very first character on the line.

port 1883

# =================================================================
# General configuration
# =================================================================

# Write process id to a file. Default is a blank string which means
# a pid file shouldn't be written.
# This should be set to /var/run/mosquitto/mosquitto.pid if mosquitto is
# being run automatically on boot with an init script and
# start-stop-daemon or similar.
#pid_file
pid_file /var/run/mosquitto/mosquitto.pid

# =================================================================
# Persistence
# =================================================================
# Save persistent message data to disk (true/false).
# This saves information about all messages, including
# subscriptions, currently in-flight messages and retained
# messages.
# retained_persistence is a synonym for this option.
#persistence false
persistence true

# Location for persistent database.
# Default is an empty string (current directory).
# Set to e.g. /var/lib/mosquitto if running as a proper service on Linux or
# similar.
#persistence_location
persistence_location /var/lib/mosquitto/


# Places to log to. Use multiple log_dest lines for multiple
# logging destinations.
# Possible destinations are: stdout stderr syslog topic file dlt
#
# stdout and stderr log to the console on the named output.
#
# syslog uses the userspace syslog facility which usually ends up
# in /var/log/messages or similar.
#
# topic logs to the broker topic '$SYS/broker/log/<severity>',
# where severity is one of D, E, W, N, I, M which are debug, error,
# warning, notice, information and message. Message type severity is used by
# the subscribe/unsubscribe log_types and publishes log messages to
# $SYS/broker/log/M/susbcribe or $SYS/broker/log/M/unsubscribe.
#
# The file destination requires an additional parameter which is the file to be
# logged to, e.g. "log_dest file /var/log/mosquitto.log". The file will be
# closed and reopened when the broker receives a HUP signal. Only a single file
# destination may be configured.
#
# The dlt destination is for the automotive `Diagnostic Log and Trace` tool.
# This requires that Mosquitto has been compiled with DLT support.
#
# Note that if the broker is running as a Windows service it will default to
# "log_dest none" and neither stdout nor stderr logging is available.
# Use "log_dest none" if you wish to disable logging.
#log_dest stderr
log_dest file /var/log/mosquitto/mosquitto.log


# =================================================================
# Security
# =================================================================
# Boolean value that determines whether clients that connect
# without providing a username are allowed to connect. If set to
# false then a password file should be created (see the
# password_file option) to control authenticated client access.
#
# Defaults to false, unless there are no listeners defined in the configuration
# file, in which case it is set to true, but connections are only allowed from
# the local machine.
#allow_anonymous false
allow_anonymous true

$ sudo systemctl start mosquitto
$ sudo systemctl enable mosquitto
Created symlink /etc/systemd/system/multi-user.target.wants/mosquitto.service → /usr/lib/systemd/system/mosquitto.service.

$ mosquitto_sub -h localhost -t test_topic

$ mosquitto_pub -h localhost -t test_topic -m "Hello World!"

$ mosquitto_pub -h <adresse_ip> -t test_topic -m "Hello World depuis un autre pc!"