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Add DTLS support
DTLS (TLS for UDP) support is currently missing from the standard library, requiring direct interfacing with OpenSSL (1.1.1 or later). There is an existing implementation, python3-dtls which could serve as a reference, but it uses ctypes while we want to use CFFI for PyPy compatibility.
You might want to read these details by Nathanael
Trio has a PR for this now: https://github.com/python-trio/trio/pull/2047