Install the packages:

# apt-get install mosquitto
# apt-get install mosquitto-clients

Update the config file:

# nano /etc/mosquitto/mosquitto.conf
------------------------------------
pid_file /run/mosquitto/mosquitto.pid

persistence true
persistence_location /var/lib/mosquitto/

log_dest file /var/log/mosquitto.log

include_dir /etc/mosquitto/conf.d

allow_anonymous true
log_type error
log_type warning
#log_type notice
#log_type information

connection_messages true
log_timestamp true