feat: dtls connection using mbedtls #10
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Presentation
This PR is part of the stack to create the nim-libp2p webrtc-direct transport (defined here: https://github.com/libp2p/specs/blob/master/webrtc/webrtc-direct.md).
For this PR, we do not implement the full DTLS protocol, we are using the library MBed-TLS (nim wrapper: https://github.com/status-im/nim-mbedtls / C-library https://github.com/Mbed-TLS/mbedtls) to create and use a DTLS connection.
DTLS
DTLS is a protocol designed to provide the same security features as TLS, but for UDP applications. It secures communications over UDP, which is inherently unreliable and connectionless. By using DTLS, WebRTC ensures that all data streams are encrypted and secure from potential eavesdropping, tampering, and other security threats.