I have recently learned about this site, and I was hoping to get a certificate from here. The problem is, I do not have a domain name, and use instead an ip. I would like to (1) get cert files (not the client), and (2) get it for an ip.
Let’s Encrypt does not to issue certificates for bare IP addresses, sorry.
You can consult the topic https://community.letsencrypt.org/t/certificate-for-public-ip-without-domain-name that discuss about ip certificates.