Go to file
payne.ye bd8f69e438 smp: extend client to work with tsi
and take care of zombie sul previously left on connect failure path
2024-04-12 06:25:21 +01:00
READMEs Subject: sul: Update README.lws_sul.md 2023-11-24 05:49:02 +00:00
cmake mbedtls: auto adapt to changed session constant 2023-11-07 06:40:07 +00:00
contrib qnx: toolchain file and adaptations 2022-01-04 15:58:41 +00:00
doc-assets README.md: update with work retrospective and more Sai info 2021-10-05 06:48:26 +01:00
include genaes: fix lws_genaes_create comment 2024-03-06 13:10:18 +00:00
lib smp: extend client to work with tsi 2024-04-12 06:25:21 +01:00
lwsws lws_metrics 2021-03-08 21:47:28 +00:00
minimal-examples h2: cleanly return if fd is -1 on custom close 2024-03-08 06:44:22 +00:00
minimal-examples-lowlevel/raw/minimal-raw-client raw: tls conns 2022-05-17 15:34:30 +01:00
plugin-standalone plugins: add option LWS_WITH_PLUGINS_BUILTIN 2021-01-31 20:24:29 +00:00
plugins clean: remove needless LWS_PRE 2022-05-17 15:53:53 +01:00
scripts cose: keys and signing + validation 2021-08-31 05:45:35 +01:00
test-apps test-apps: use correct EXTERNAL_POLL flag 2022-06-17 04:57:23 +01:00
win32port mingw: libevent build fixes 2020-11-28 10:58:38 +00:00
.gitignore dhcp: clean 2021-02-17 11:39:15 +00:00
.mailmap mailmap 2018-08-14 08:00:30 +08:00
.sai.json jit-trust: adapt for esp-idf pre v3 mbedtls 2022-02-09 20:12:31 +00:00
CMakeLists-implied-options.txt qnx: toolchain file and adaptations 2022-01-04 15:58:41 +00:00
CMakeLists.txt v4.3.3 2023-11-20 06:27:02 +00:00
Kconfig esp32: enforce ssl nonblocking 2017-04-03 14:09:37 +08:00
LICENSE lecp: add CBOR stream parser LECP like JSON LEJP 2021-08-21 17:44:40 +01:00
Makefile.projbuild esp32-selfsigned 2017-12-01 11:37:35 +08:00
README.md v4.3.0 2021-10-05 07:40:17 +01:00
bug_report.md docs: switch to use main 2020-10-19 16:35:03 +01:00
changelog v4.3.0 2021-10-05 07:40:17 +01:00
component.mk Fixes to track updates in esp-idf 2018-06-20 16:41:28 +08:00
libwebsockets.dox ss: server: add foreach client cb api 2020-11-11 06:58:20 +00:00


CI status Coverity Scan Build Status CII Best Practices Codacy Badge Total alerts Language grade: C/C++ Language grade: JavaScript


Libwebsockets is a simple-to-use, MIT-license, pure C library providing client and server for http/1, http/2, websockets, MQTT and other protocols in a security-minded, lightweight, configurable, scalable and flexible way. It's easy to build and cross-build via cmake and is suitable for tasks from embedded RTOS through mass cloud serving.

It supports a lot of lightweight ancilliary implementations for things like JSON, CBOR, JOSE, COSE, and supports OpenSSL and MbedTLS v2 and v3 out of the box for everything. It's very gregarious when it comes to event loop sharing, supporting libuv, libevent, libev, sdevent, glib and uloop, as well as custom event libs.

100+ independent minimal examples for various scenarios, CC0-licensed (public domain) for cut-and-paste, allow you to get started quickly.

There are a lot of READMEs on a variety of topics.

We do a huge amount of CI testing per push, currently 582 builds on 30 platforms. You can see the lws CI rack and read about how lws-based Sai is used to coordinate all the testing.



v4.3 is released

See the changelog

Lws work retrospective

The initial commit for lws will have been 11 years ago come Oct 28 2021, it's been a lot of work. There are a total of 4.3K patches, touching 800KLOC cumulatively (this is not the size in the repo, but over the years, how many source lines were changed by patches).


Gratifyingly, it turns out over the years, ~15% of that was contributed by 404 contributors: that's not so bad. Thanks a lot to everyone who has provided patches.

Today at least tens of millions of devices and product features rely on lws to handle their communications including several from FAANG; Google now include lws as part of Android sources.


This is the libwebsockets C library for lightweight websocket clients and servers. For support, visit


and consider joining the project mailing list at


You can get the latest version of the library from git:

Doxygen API docs for development: https://libwebsockets.org/lws-api-doc-main/html/index.html