MQTT

MQTT Install
        sudo apt-get install mosquitto -y
        sudo apt-get install mosquitto-clients

Configure MQTT
        sudo nano /etc/mosquitto/mosquitto.conf

Append these lines to the bottom of the file and save it:
        allow_anonymous false
        password_file /etc/mosquitto/pwfile
        listener 1883

Set an MQTT username and password
        sudo mosquitto_passwd -c /etc/mosquitto/pwfile YOUR-NEW-MQTT-USERNAME

Test the broker
        mosquitto_sub -d -u YOUR-MQTT-USERNAME -P YOUR-MQTT-PASSWORD -t dev/test