I already have a website set up and running well on a droplet. I have a domain name pointing at this website, which I installed using the Wordpress One-Click droplet installer.
I would also like to setup an MQTT broker. Following the instructions here: https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-the-mosquitto-mqtt-messaging-broker-on-debian-10
I was able to set up a localhost MQTT broker with no issues. However, if I try to use certbot as detailed in the instructions, it fails on port 80. Probably because I already have certbot configured for my website using apache, as explained here: https://marketplace.digitalocean.com/apps/wordpress#enable-https
I have two questions, which are probably related.
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.