It is not a requirement to use the TREP daemon-less config to use this API. In fact, the latest ADS version (3.2) can be used and cascaded from older TREP deployment to use this feature.
This question was first asked in an Introduction to the Elektron WebSocket API webinar (29th of Nov). Please see here: Introduction to the Elektron WebSocket API
We need to use the Secure protocol only, does Elektron WebSocket API support wss connection? Does TREP perform wss for us or we need to set our own SSL accelerator? (from WebSocket API Webinar Nov 29)