What type of value should I provide for the SNI? The only thing I see listed in the Erlang docs are disable 
I tried providing a string with the domain (server_name_indication: "domain.ext"), but that produces an error.
This could be what I need, though. I’ve added certs_keys: [...] to the options and I’m getting TLS :client: In state :connection received SERVER ALERT: Fatal - Certificate Unknown
