Initial: https://community.octoprint.org/t/lets-encrypt-on-octopi/15328
DuckDNS: DuckDNS_Token="xxxxxxxxxxxxxxxxxxxxxxxxxxxxx" acme.sh --issue --dns dns_duckdns -d subdomain.duckdns.org --renew-hook "cat /root/.acme.sh/subdomain.duckdns.org/fullchain.cer /root/.acme.sh/subdomain.duckdns.org/subdomain.duckdns.org.key >/etc/ssl/certificado.pem && systemctl reload haproxy"
HAProxy (DietPi): https://github.com/guysoft/OctoPi/tree/70294fa03277c6ca9d013de799c619f50dd12cdf/src/modules/octopi/filesystem/root/etc/haproxy
HAProxy.cfg: Change port 127.0.0.1:5000 by 5001 & add octoprint's error files to errors folder