Can we use TLS flags?

[thomas-fossati]

We'd like to use TLS Flags to negotiate RRC.

At the moment, the document seems to be defined for (D)TLS 1.3 only, but the reason why the same scheme would not be applicable to 1.2 are not fully clear.

For now (-01), optimistically, we are using it in a version agnostic fashion, hoping that eventually that will be the case.

Achim has opened an issue on the TLS flags repo. This issue is for tracking on the RRC side.