Apache NuttX is a mature, real-time embedded operating system (RTOS) https://nuttx.apache.org/
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Shunchao Hu ab0ad3cee5 drivers/net/telnet: Ignore unsupported subnegotiation data.
Ignore unsupported telnet subnegotiation payload until `IAC SE` so
option bytes do not leak into the first NSH command.

Keep existing NAWS handling intact and also treat `IAC IAC` inside
subnegotiation payload as an escaped `0xFF` data byte rather than a
subnegotiation terminator.

This makes subnegotiation parsing RFC-compliant for both unsupported
options and NAWS payload processing.

Signed-off-by: Shunchao Hu <ankohuu@gmail.com>
2026-03-27 17:16:06 +08:00
.github build(deps): bump actions/download-artifact from 7 to 8 2026-03-02 09:15:02 +01:00
arch stm32h5/adc: fix TROVS bit and watchdog threshold register writes 2026-03-27 17:15:21 +08:00
audio Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
binfmt Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
boards boards/arm/imx9: add i.MX93 Quick Start Board (QSB) support. 2026-02-28 10:30:06 +08:00
cmake libc: add support for C23 stdbit.h with bit manipulation macros 2026-03-02 09:09:40 -03:00
crypto Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
Documentation libc: add support for C23 stdbit.h with bit manipulation macros 2026-03-02 09:09:40 -03:00
drivers drivers/net/telnet: Ignore unsupported subnegotiation data. 2026-03-27 17:16:06 +08:00
dummy build: add initial cmake build system 2023-07-08 13:50:48 +08:00
fs fs: disable fs automounter when no signals 2026-02-26 20:03:05 +08:00
graphics Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
include libc: add support for C23 stdbit.h with bit manipulation macros 2026-03-02 09:09:40 -03:00
libs libs/libc: add configurable skip count for mutex backtrace addresses 2026-02-27 19:54:37 +08:00
mm mm/mempool: fix the entry condition for semaphore during mempool allocation 2026-02-28 00:24:54 +08:00
net Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
openamp Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
pass1 Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
sched sched/group_foreachchild.c: fix warning 2026-03-27 17:15:15 +08:00
syscall Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
tools libc: add support for C23 stdbit.h with bit manipulation macros 2026-03-02 09:09:40 -03:00
video Makefile: Remove make depend files by make distclean 2026-02-16 16:27:57 +01:00
wireless drivers/net: remove nxsig_notification when signal support is disabled 2026-02-26 20:03:05 +08:00
.asf.yaml github: master branch protection tune. 2025-05-07 18:37:13 -05:00
.codespell-ignore-lines net/icmpv6: replace net_lock with conn_lock and conn_lock_dev 2025-12-29 09:42:18 +08:00
.codespellrc codespellrc: add ist to ignorelist 2025-10-14 17:42:01 +08:00
.editorconfig .editorconfig: fix character encoding property specification 2025-11-28 19:12:13 +08:00
.gitignore gitignore: add more vim swap files 2025-06-18 15:44:51 -04:00
.gitmessage docs/contributing: Add a commit message template 2025-06-03 17:33:24 +08:00
.pre-commit-config.yaml pre-commit: enable codespell checks 2025-05-05 12:34:39 +08:00
.yamllint
AUTHORS AUTHORS: add Donny Jiuzhu 2026-02-25 10:17:40 +01:00
CMakeLists.txt cmake: Enhance .config handling and comparison logic 2026-02-26 09:46:02 -03:00
CONTRIBUTING.md doc: Contributing Guide updates. 2026-02-19 12:11:14 -05:00
INVIOLABLES.md
Kconfig libc: add support for C23 stdbit.h with bit manipulation macros 2026-03-02 09:09:40 -03:00
LICENSE style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
Makefile tools: migrate to SPDX identifier 2024-09-10 23:11:11 +08:00
NOTICE Remove the double blank line from source files 2022-02-20 20:10:14 +01:00
README.md Gathering community recommendations 2023-10-28 13:55:56 +08:00
ReleaseNotes Documentation: move ReleaseNotes 2023-09-26 20:41:00 +08:00

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Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).

For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.

Getting Started

First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.

Documentation

You can find the current NuttX documentation on the Documentation Page.

Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.

The old NuttX documentation is still available in the Apache wiki.

Supported Boards

NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.

Contributing

If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.

License

The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.