Install Mosquitto MQTT server
apt install mosquitto mosquitto-clientsCreate a new config file for Mosquitto (you can name it whatever you want)
vim /etc/mosquitto/conf.d/primary.confBy default, Mosquitto only listens on localhost, to listen on all interfaces, use the following config
persistence false
# mqtt
listener 1883
protocol mqtt
# websockets
listener 9001
protocol websockets