#mosquitto conf file docs
https://mosquitto.org/man/mosquitto-conf-5.html

#conf file 
allow_anonymous false #must have user
connection_messages true #log client connect and disconnect
password_file /etc/mosquitto/passwd #speicyf path to password file
max_connections 5 #demo purpose
listener 8883 #port for tls
certfile /etc/letsencrypt/live/mqtt.teeseng.uk/cert.pem
cafile /etc/letsencrypt/live/mqtt.teeseng.uk/chain.pem
keyfile /etc/letsencrypt/live/mqtt.teeseng.uk/privkey.pem