From what I can tell, in all my searching and tests, if I set up my own jabber server (using ejabberd) I can not do s2s with TLS to and from google XMPP servers.
When I connect, the ejabberd log records:
I(<0.377.0>:ejabberd_s2s_out:365) : Connection established: XXXX.net -> gmail.com with TLS=false
Is it even possible to do S2S TLS with google XMPP servers?