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feat(lws): Add lws server example
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‎.github/workflows/lws_server_build.yml

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name: "lws: build-tests-server"
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on:
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push:
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branches:
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- master
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pull_request:
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types: [opened, synchronize, reopened, labeled]
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jobs:
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build_lws_server:
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if: contains(github.event.pull_request.labels.*.name, 'lws') || github.event_name == 'push'
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name: Libwebsockets server build
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strategy:
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matrix:
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idf_ver: ["latest", "release-v5.3", "release-v5.4"]
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test: [ { app: example, path: "examples/server-echo" }]
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runs-on: ubuntu-22.04
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container: espressif/idf:${{ matrix.idf_ver }}
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env:
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TEST_DIR: components/libwebsockets/${{ matrix.test.path }}
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steps:
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- name: Checkout esp-protocols
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uses: actions/checkout@v4
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with:
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submodules: recursive
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- name: Build ${{ matrix.example }} with IDF-${{ matrix.idf_ver }}
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shell: bash
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run: |
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. ${IDF_PATH}/export.sh
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python -m pip install idf-build-apps
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python ./ci/build_apps.py ${TEST_DIR}
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cd ${TEST_DIR}
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for dir in `ls -d build_esp32_*`; do
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$GITHUB_WORKSPACE/ci/clean_build_artifacts.sh `pwd`/$dir
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zip -qur artifacts.zip $dir
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done
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- uses: actions/upload-artifact@v4
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with:
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name: lws_target_esp32_${{ matrix.idf_ver }}_${{ matrix.test.app }}
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path: ${{ env.TEST_DIR }}/artifacts.zip
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if-no-files-found: error
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run-target-lws-server:
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if: |
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github.repository == 'espressif/esp-protocols' &&
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( contains(github.event.pull_request.labels.*.name, 'lws') || github.event_name == 'push' )
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name: Target server test
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needs: build_lws_server
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strategy:
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fail-fast: false
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matrix:
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idf_ver: ["latest", "release-v5.3", "release-v5.4"]
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idf_target: ["esp32"]
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test: [ { app: example, path: "examples/server-echo" }]
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runs-on:
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- self-hosted
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- ESP32-ETHERNET-KIT
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env:
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TEST_DIR: components/libwebsockets/${{ matrix.test.path }}
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steps:
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- uses: actions/checkout@v4
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- uses: actions/download-artifact@v4
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with:
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name: lws_target_esp32_${{ matrix.idf_ver }}_${{ matrix.test.app }}
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path: ${{ env.TEST_DIR }}/ci/
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- name: Install Python packages
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env:
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PIP_EXTRA_INDEX_URL: "https://www.piwheels.org/simple"
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run: |
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pip install --only-binary cryptography --extra-index-url https://dl.espressif.com/pypi/ -r $GITHUB_WORKSPACE/ci/requirements.txt websocket-client
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- name: Run Example Test on target
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working-directory: ${{ env.TEST_DIR }}
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run: |
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unzip ci/artifacts.zip -d ci
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for dir in `ls -d ci/build_*`; do
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rm -rf build sdkconfig.defaults
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mv $dir build
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python -m pytest --log-cli-level DEBUG --junit-xml=./results_${{ matrix.test.app }}_${{ matrix.idf_target }}_${{ matrix.idf_ver }}_${dir#"ci/build_"}.xml --target=${{ matrix.idf_target }}
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done
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- uses: actions/upload-artifact@v4
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if: always()
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with:
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name: results_${{ matrix.test.app }}_${{ matrix.idf_target }}_${{ matrix.idf_ver }}.xml
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path: components/libwebsockets/${{ matrix.test.path }}/*.xml

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

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# The following lines of boilerplate have to be in your project's CMakeLists
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# in this exact order for cmake to work correctly
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cmake_minimum_required(VERSION 3.16)
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set(requirements 1)
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include($ENV{IDF_PATH}/tools/cmake/project.cmake)
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project(server_echo_example)

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

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

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

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set(SRC_FILES "lws-server-echo.c") # Initialize SRC_FILES as an empty list
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set(INCLUDE_DIRS ".") # Define include directories
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set(EMBED_FILES) # Initialize EMBED_FILES as an empty list
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list(APPEND EMBED_FILES
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"certs/server_cert.pem"
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"certs/ca_cert.pem"
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"certs/server_key.pem")
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idf_component_register(SRCS "${SRC_FILES}"
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INCLUDE_DIRS "${INCLUDE_DIRS}"
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EMBED_TXTFILES "${EMBED_FILES}")

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

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menu "Example Configuration"
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config WEBSOCKET_PORT
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int "Websocket endpoint PORT"
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default 80
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help
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Port of websocket endpoint this example connects to and sends echo
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config WS_OVER_TLS
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bool "Enable WebSocket over TLS with Server Certificate"
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default y
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help
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Enables WebSocket connections over TLS (WSS)
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endmenu

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

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-----BEGIN CERTIFICATE-----
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MIIDazCCAlOgAwIBAgIUL04QhbSEt5oNbV4f7CeLLqTCw2gwDQYJKoZIhvcNAQEL
3+
BQAwRTELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
4+
GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDAeFw0yNDAyMjMwODA2MjVaFw0zNDAy
5+
MjAwODA2MjVaMEUxCzAJBgNVBAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEw
6+
HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQwggEiMA0GCSqGSIb3DQEB
7+
AQUAA4IBDwAwggEKAoIBAQDjc78SuXAmJeBc0el2/m+2lwtk3J/VrNxHYkhjHa8K
8+
/ybU89VvKGuv9+L3IP67WMguFTaMgivJYUePjfMchtNJLJ+4cR9BkBKH4JnyXDae
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AgdDfiTupxYLJFz4hFPhfgCh4TjQ+f9+uP4IAjW42dJmTVZjLEku/hm5lxCFObAq
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RgfaNwH8Ug1r1xswjSZG
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-----END CERTIFICATE-----

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

+20
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@@ -0,0 +1,20 @@
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-----BEGIN CERTIFICATE-----
2+
MIIDWjCCAkKgAwIBAgIUUPCOgMA2v09E29fCkogx3RUBRtEwDQYJKoZIhvcNAQEL
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BQAwRTELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
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MjAwODA3MzFaMEUxCzAJBgNVBAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEw
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AQUAA4IBDwAwggEKAoIBAQCrNeomxI2aoP+4iUy5SiA+41oHUDZDFeJOBjv5JCsK
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BX5WI8UjN6rECBHbtNRvEh06ogDdHbxYV+TibrqkkeDRw6HX1qqiEJ+iCgWEDQ==
20+
-----END CERTIFICATE-----

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

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@@ -0,0 +1,28 @@
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-----BEGIN PRIVATE KEY-----
2+
MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCrNeomxI2aoP+4
3+
iUy5SiA+41oHUDZDFeJOBjv5JCsKmlvFqxE9zynmPOVpuABErOJwzerPTa4NYKvu
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27+
6mY9FnUUufbJcpHxN58RTw==
28+
-----END PRIVATE KEY-----

‎components/libwebsockets/examples/server-echo/main/certs/server_cert.pem

+20
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@@ -0,0 +1,20 @@
1+
-----BEGIN CERTIFICATE-----
2+
MIIDWjCCAkKgAwIBAgIUUPCOgMA2v09E29fCkogx3RUBRtAwDQYJKoZIhvcNAQEL
3+
BQAwRTELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
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GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDAeFw0yNDAyMjMwODA2NTlaFw0zNDAy
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MjAwODA2NTlaMEUxCzAJBgNVBAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEw
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AQUAA4IBDwAwggEKAoIBAQC8WWbDxnLzTSfuQaO+kQnnzbwjhUHWn58s+BIEaO8M
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GG6bX+8r/SH9XjMfFS36qAN3qxgRun3YoRTaHc2QByiGjf5IL4EAPDnLN+NzUIL5
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RPkY2Yo8f8gEiqXQd+0qTuMgumbgkPq3V8Lk1ocy62F5/qUhXxH+ifAXEoUQS6EG
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jcnLa31TdDdWmWYDcYgZntAv6yGi3rh0MdYqeNS0FKlMKmaH81VHs7V1UUXwUQ==
20+
-----END CERTIFICATE-----

‎components/libwebsockets/examples/server-echo/main/certs/server_key.pem

+28
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@@ -0,0 +1,28 @@
1+
-----BEGIN PRIVATE KEY-----
2+
MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQC8WWbDxnLzTSfu
3+
QaO+kQnnzbwjhUHWn58s+BIEaO8MGG6bX+8r/SH9XjMfFS36qAN3qxgRun3YoRTa
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Hc2QByiGjf5IL4EAPDnLN+NzUIL57Gi2QPQP/GksAsOGKWk/nMRPk1vcMptkFVIW
5+
Sp474SQ0A92Z9z0dUIqBpjRa34krHsAIcT59/EG7YBBadMk0fQIxQVLh3Vosky85
6+
q+0waFihe47Ef5U2UftexoUx4Vcz6EtP60Wx+4qN+FLsr+n2B7Oz2ITqfwgqLzjN
7+
LZwm9bMjcLZ0fWm1A/W1C989MXwIw6DAPEZv7pbgp8r9phyrNieSDuuRaCvFsaXh
8+
6troAjLxAgMBAAECggEACNVCggTxCCMCr+RJKxs/NS1LWPkbZNbYjrHVmnpXV6Bf
9+
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14+
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15+
C0TuiOGI59hYGI94NvVLAmOutR+vJ/3jhbv5wyqEQLhJ42Yz9kWBrDCI+V3q3TdO
16+
H7wcH6suUIZpeLEJF4qHzY/1dwKBgQC9U/Pvswiww8sfysmd5shUNo4ofAZnTM1A
17+
ak6pWE3lSyiOkSm+3B2GqxYWLRoo1v+pTyhhXDtRRmxGtMNrKCsmlHef/o3c6kkG
18+
cuC2h/DiSmoITHy3BYKJoDeE54E8ubXUUKqHo41LYUs+D7M/IGxeiO13MUoIrEtF
19+
AwzVWPBU1wKBgH8barD2x6Bm+XWCHy6qIZlxGsMfDN1r2gTdvhWJhcj3D/Sj5heO
20+
X+lfbsxtKee+yOHcDesK3y8D9jjKkSHmTvgSfyX6OML3NxvTqidOwPugUHj2J8QX
21+
qhLk8mJhftj50reacWRf0TV76ADhecnXEuaic6hA7mTTpOAZzL0svm3PAoGBALWF
22+
r6VLX3KzVqZVtLb7FWmAoQ35093pCgXPpznAW3cTd4Axd/fxbTG4CUYb2i/760X2
23+
ij3Gw2yqe5fTKmYsLisgQA2bb4K28msHa6I2dmNQe5cXVp/X3Y98mJ6JpCSH3ekB
24+
qm7ABfGXCCApx28n9B8zY5JbJKNqJgS15vELA+ojAoGAAkaV2w46+3iQ6gJtQepr
25+
zGNybiYBx/Wo5fDdTS5u0xN+ZdC9fl2Zs0n7sMmUT8bWdDLcMnntHHO+oDIKyRHs
26+
TQh1n68vQ4JoegQv3Z9Z/TLEKqr9gyJC1Ao6M4bZpPhUWQwupfHColtsr2TskcnJ
27+
Nf2FpJZ7z6fQEShGlK1yTXM=
28+
-----END PRIVATE KEY-----

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

+6
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
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dependencies:
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espressif/libwebsockets:
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version: "*"
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override_path: "../../../"
5+
protocol_examples_common:
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path: ${IDF_PATH}/examples/common_components/protocol_examples_common

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