It's the server that's hosting HA that needs the certificate, which is all done with the http integration* - although unless you're using a domain / DNS record, you can't use letsencrypt.
You might find that other integrations don't like self-signed certificates either (without a lot of fucking about).
As a caveat - I had it all set up locally, and had it forwarded to a domain, so used letsencrypt. I stopped bothering after a while though, as I didn't I don't need it exposed externally that much.
Got you.
It's the server that's hosting HA that needs the certificate, which is all done with the http integration* - although unless you're using a domain / DNS record, you can't use letsencrypt.
You might find that other integrations don't like self-signed certificates either (without a lot of fucking about).
As a caveat - I had it all set up locally, and had it forwarded to a domain, so used letsencrypt. I stopped bothering after a while though, as I didn't I don't need it exposed externally that much.
* I just have two lines in http.yaml with
iirc there was dicking about with formatting the keys and certificates correctly