feat(lws): Add Libwebsockets component

Minimal client echo example
Minmal server echo example

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "components/mosquitto/mosquitto"]
 	path = components/mosquitto/mosquitto
 	url = https://github.com/eclipse/mosquitto
+[submodule "components/libwebsockets/libwebsockets"]
+	path = components/libwebsockets/libwebsockets
+	url = https://github.com/warmcat/libwebsockets.git

.pre-commit-config.yaml

@@ -61,8 +61,8 @@ repos:
   - repo: local
     hooks:
       - id: commit message scopes
-        name: "commit message must be scoped with: mdns, modem, websocket, asio, mqtt_cxx, console, common, eppp, tls_cxx, mosq, sockutls"
-        entry: '\A(?!(feat|fix|ci|bump|test|docs|chore)\((mdns|modem|common|console|websocket|asio|mqtt_cxx|examples|eppp|tls_cxx|mosq|sockutls)\)\:)'
+        name: "commit message must be scoped with: mdns, modem, websocket, asio, mqtt_cxx, console, common, eppp, tls_cxx, mosq, sockutls, lws"
+        entry: '\A(?!(feat|fix|ci|bump|test|docs|chore)\((mdns|modem|common|console|websocket|asio|mqtt_cxx|examples|eppp|tls_cxx|mosq|sockutls|lws)\)\:)'
         language: pygrep
         args: [--multiline]
         stages: [commit-msg]

components/libwebsockets/CMakeLists.txt

@@ -0,0 +1,24 @@
+idf_component_register()
+
+option(LWS_WITH_EXPORT_LWSTARGETS "Export libwebsockets CMake targets.  Disable if they conflict with an outer cmake project." OFF)
+set(LWS_WITH_EXPORT_LWSTARGETS OFF)
+
+option(LWS_PLAT_FREERTOS "Build for FreeRTOS" ON)
+set(LWS_PLAT_FREERTOS ON)
+
+option(LWS_WITH_MBEDTLS "Build for FreeRTOS" ON)
+set(LWS_WITH_MBEDTLS ON)
+
+set(WRAP_FUNCTIONS mbedtls_ssl_handshake_step
+                   lws_adopt_descriptor_vhost)
+
+foreach(wrap ${WRAP_FUNCTIONS})
+    target_link_libraries(${COMPONENT_LIB} INTERFACE "-Wl,--wrap=${wrap}")
+endforeach()
+
+target_link_libraries(${COMPONENT_LIB} INTERFACE websockets)
+
+target_sources(${COMPONENT_LIB} INTERFACE "port/lws_port.c")
+
+
+add_subdirectory(libwebsockets)

components/libwebsockets/examples/client-echo/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(client_echo_example)

components/libwebsockets/examples/client-echo/README.md

@@ -0,0 +1,67 @@
+# Websocket LWS client example
+
+This example will shows how to set up and communicate over a websocket.
+
+## How to Use Example
+
+### Hardware Required
+
+This example can be executed on any ESP32 board, the only required interface is WiFi and connection to internet or a local server.
+
+### Configure the project
+
+* Open the project configuration menu (`idf.py menuconfig`)
+* Configure Wi-Fi or Ethernet under "Example Connection Configuration" menu.
+* Configure the websocket endpoint URI under "Example Configuration"
+
+### Server Certificate Verification
+
+
+### Generating a self signed Certificates with OpenSSL
+
+
+### Build and Flash
+
+Build the project and flash it to the board, then run monitor tool to view serial output:
+
+```
+idf.py -p PORT flash monitor
+```
+
+(To exit the serial monitor, type ``Ctrl-]``.)
+
+See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
+
+## Example Output
+
+
+## Python Flask echo server
+
+By default, the `ws://echo.websocket.events` endpoint is used. You can setup a Python websocket echo server locally and try the `ws://<your-ip>:5000` endpoint. To do this, install Flask-sock Python package
+
+```
+pip install flask-sock
+```
+
+and start a Flask websocket echo server locally by executing the following Python code:
+
+```python
+from flask import Flask
+from flask_sock import Sock
+
+app = Flask(__name__)
+sock = Sock(app)
+
+
+@sock.route('/')
+def echo(ws):
+    while True:
+        data = ws.receive()
+        ws.send(data)
+
+
+if __name__ == '__main__':
+    # To run your Flask + WebSocket server in production you can use Gunicorn:
+    # gunicorn -b 0.0.0.0:5000 --workers 4 --threads 100 module:app
+    app.run(host="0.0.0.0", debug=True)
+```

components/libwebsockets/examples/client-echo/main/CMakeLists.txt

@@ -0,0 +1,12 @@
+set(SRC_FILES "lws-client-echo.c") # Define source files
+set(INCLUDE_DIRS ".") # Define include directories
+set(EMBED_FILES "") # Initialize an empty list for files to embed
+
+list(APPEND EMBED_FILES
+    "certs/client_cert.pem"
+    "certs/ca_cert.pem"
+    "certs/client_key.pem")
+
+idf_component_register(SRCS "${SRC_FILES}"
+                       INCLUDE_DIRS "${INCLUDE_DIRS}"
+                       EMBED_TXTFILES "${EMBED_FILES}")

components/libwebsockets/examples/client-echo/main/Kconfig.projbuild

@@ -0,0 +1,33 @@
+menu "Example Configuration"
+
+    config WEBSOCKET_URI
+        string "Websocket endpoint URI"
+        default ""
+        help
+            URL or IP of websocket endpoint this example connects to and sends echo
+    config WEBSOCKET_PORT
+        int "Websocket endpoint PORT"
+        default 80
+        help
+            Port of websocket endpoint this example connects to and sends echo
+
+    config WS_OVER_TLS_SERVER_AUTH
+        bool "Enable WebSocket over TLS with Server Certificate Verification Only"
+        default y
+        help
+            Enables WebSocket connections over TLS (WSS) with server certificate verification.
+            This setting mandates the client to verify the servers certificate, while the server
+            does not require client certificate verification.
+
+    config WS_OVER_TLS_MUTUAL_AUTH
+        bool "Enable WebSocket over TLS with Server Client Mutual Authentification"
+        default n
+        help
+            Enables WebSocket connections over TLS (WSS) with server and client mutual certificate verification.
+
+    config WS_OVER_TLS_SKIP_COMMON_NAME_CHECK
+        bool "Skip common name(CN) check during TLS authentification"
+        default y
+        help
+            Skipping Common Name(CN) check during TLS(WSS) authentification
+endmenu

components/libwebsockets/examples/client-echo/main/certs/ca_cert.pem

@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDazCCAlOgAwIBAgIUL04QhbSEt5oNbV4f7CeLLqTCw2gwDQYJKoZIhvcNAQEL
+BQAwRTELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
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+RgfaNwH8Ug1r1xswjSZG
+-----END CERTIFICATE-----

components/libwebsockets/examples/client-echo/main/certs/client_cert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
+MIIDWjCCAkKgAwIBAgIUUPCOgMA2v09E29fCkogx3RUBRtEwDQYJKoZIhvcNAQEL
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+-----END CERTIFICATE-----

components/libwebsockets/examples/client-echo/main/certs/client_key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCrNeomxI2aoP+4
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+6mY9FnUUufbJcpHxN58RTw==
+-----END PRIVATE KEY-----

components/libwebsockets/examples/client-echo/main/idf_component.yml

@@ -0,0 +1,6 @@
+dependencies:
+  espressif/libwebsockets:
+    version: "*"
+    override_path: "../../../"
+  protocol_examples_common:
+    path: ${IDF_PATH}/examples/common_components/protocol_examples_common