Setup:

Edit your server.yml in /usr/local/etc/ntfy/ to set your hostname, listening
IP/port, and any other desired settings. 

The nfty server service runs as a unprivileged user and must use a port 
higher than 1024. Use a webserver or reverse proxy in front of ntfy to 
provide http/https access. 

Copy index.html to your webserver docs directory (e.g.
https://ntfy.mydomain.com/docs/) to redirect to the online https://docs.ntfy.sh
when a user clicks on the documentation button. Alternatively, you can mirror
the online docs to your docs directory if you don't want to rely on theirs.

Use 'sysrc ntfy_enable="YES"' or add 'ntfy_enable="YES"' to your /etc/rc.conf 
or /etc/rc.conf.d/ntfy manually to enable the service. Use 'service ntfy start'
to start the service.