[goandrei]

Summary

This PR introduces support for ngtcp2 library which implements the QUIC protocol following RFC9000. As a crypto engine, this change uses the already present wolfssl library.

In short, the changes:

• update wolfssl makefile to build source files required by QUIC
• enforce WOLFSSL_VERSION when cloning wolfssl
• add QUIC specific macro definitions in wolfssl's user_settings.h file
• introduce netutils/ngtcp2 with tipical required files

Impact

The change is guarded by a new Kconfig called NETUTILS_QUIC which is set to false by default. Only if enabled, ngtcp2 will be built.

Testing

To build this, I used the esp32-devkitc:nsh configuration. No other testing was done since I did not introduce any example binary yet. I am planning to add this in a future PR.

[xiaoxiang781216]

@goandrei please fix the style error: https://github.com/apache/nuttx-apps/actions/runs/42861739358/job/130266475178?pr=4012

[xiaoxiang781216]

@goandrei please fix https://github.com/apache/nuttx-apps/actions/runs/43474208459/job/132394474279?pr=4012:

../nuttx/tools/checkpatch.sh -c -u -m -g 286c81002998664488435aa7240c0f3671dc7a7f..HEAD
Used config files:
    1: .codespellrc
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:22:0: error: C++ style comment
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:22:75: error: Operator/assignment must be preceded with whitespace
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:23:0: error: C++ style comment
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:23:3: error: Mixed case identifier found
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:23:12: error: Mixed case identifier found
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:24:0: error: C++ style comment
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:24:75: error: Operator/assignment must be preceded with whitespace
Warning: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/wolfssl/user_settings.h:26:1: warning: #include outside of 'Included Files' section
ERROR __main__.py:618: Check failed: /home/runner/work/nuttx-apps/nuttx-apps/apps/netutils/ngtcp2/CMakeLists.txt

cmake-format check failed, run following command to update the style:
  $ cmake-format <src> -o <dst>

ERROR __main__.py:618: Check failed: /home/runner/work/nuttx-apps/nuttx-apps/apps/netutils/ngtcp2/CMakeLists.txt
crypto/wolfssl/Makefile: error: Makefile modified but crypto/CMakeLists.txt was not updated.
Please maintain build-system parity between Make and CMake.
If this is a Make-only change, include '[skip-cmake-parity]' in the commit message.
Some checks failed. For contributing guidelines, see:
  https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md

[goandrei]

Linting should pass now :

agorneanu@macair nuttx-apps % ../nuttx/tools/checkpatch.sh -c -u -m -g 286c81002998664488435aa7240c0f3671dc7a7f..HEAD

Used config files:
    1: .codespellrc
✔️  All checks pass.