Just for the records, a member of telegram group documented some smooth and working setup in his blog:
Is this fully working with your TeddyCloud instance? Me, having cc3200 Toniebox, I am not able with this config, to see the Box beeing online inside TC under „Tonieboxes“. As well as connection seems not stable. Tonie/TAF download works somehow, but interrupts and resume multiple time. Radio-streams are instable as well.
Do you have cc3200 or ESP Box? Do you see „online“ status and which Tonie is currently placed under „Tonieboxes“ in TeddyCloud?
Cheers 
Hey, i use the ESP32 Box.
I think you need additional configs for CC:
ssl_protocols TLSv1.2;
ssl_ciphers 'HIGH:!aNULL:!MD5@SECLEVEL=0';
ssl_prefer_server_ciphers off;
Thanks for feedback. Unfortunately this seems not to be the trick…I’ll keep on trying…
…any hints are very welcome
what is the purpose of these certificates? My understanding is, for tcp tls.passthrough is set to true anyhow. So the certificates of the teddycloud API at port 443 will be on server side for the toniebox.
And for teddycloudweb over https a certResolver is used.
When and under which circumstances should these cert.crt/fullchain.pem or/and cert.key/ttt-teddy-key.pem be used?