How to specify TLS version

[Adam Szmyd]

Hello.

I have an service that uses `libgnuutils-dev` v3.4.10. We use it to make 
DTLS for WebRTC application.

Recently we switched the way we deploy it and noticed that 
`gnutls_handshake` started throwing this error: `Could not negotiate a 
supported cipher suite`.

Turns out after sniffing wireshark that this service is now attempting 
to use TLSv1.0 instead of TLSv1.2 as earlier.

I tried to find it in documentation 
https://www.gnutls.org/manual/gnutls.html with no luck so thats why im 
asking: what determines what kind of TLS version is used by gnutls 
library? I was maybe naively thinking there will be a configuration for 
that but maybe it depends on some system dependencies?

I'd appreciate any suggestions/help.

Thanks in advance.

Best Regards,
Adam Szmyd