The features provided by this module are now included in Prosody, you will be redirected there shortly.
c2s:show() and s2s:show() will describe the
TLS status of each connection.
With the plugin installer in Prosody 0.12 you can use:
sudo prosodyctl install --server=https://modules.prosody.im/rocks/ mod_telnet_tlsinfo
For earlier versions see the documentation for installing 3rd party modules