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<!DOCTYPE html>
<html lang="en-us">
<head>
<meta name="theme" content="Syna">
<meta name="theme-version" content="v0.15">
<meta name="theme-url" content="https://syna.okkur.org">
<meta name="theme-description" content="Highly customizable open source theme for Hugo based static websites">
<meta name="theme-author" content="Okkur Labs">
<meta name="theme-author-url" content="https://about.okkur.org">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta http-equiv="Content-Language" content="en-us">
<meta name="google" value="notranslate">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="description" content=" ">
<meta property="og:title" content="Eclipse Californium&trade;">
<meta property="og:url" content="https://eclipse.dev/californium/">
<meta property="og:description" content=" ">
<meta property="og:site_name" content="Eclipse Californium&trade;">
<meta property="og:type" content="website">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Eclipse Californium&trade;" />
<meta name="twitter:description" content=" ">
<meta name="twitter:url" content="https://eclipse.dev/californium/" />
<meta property="og:image" content="">
<meta name="twitter:image" content="">
<meta name="author" content="Eclipse Californium project">
<meta name="generator" content="Hugo 0.102.3" />
<title>Eclipse Californium™</title>
<!-- Theme Styles -->
<style>
.mx-0 {
margin-left: 0 !important;
margin-right: 0 !important; }
@-ms-viewport {
width: device-width; }
html {
box-sizing: border-box;
-ms-overflow-style: scrollbar; }
*,
*::before,
*::after {
box-sizing: inherit; }
.container {
width: 100%;
padding-right: 15px;
padding-left: 15px;
margin-right: auto;
margin-left: auto;
max-width: 540px;
max-width: 720px;
max-width: 960px;
max-width: 1140px; }
.container-fluid {
width: 100%;
padding-right: 15px;
padding-left: 15px;
margin-right: auto;
margin-left: auto; }
.row {
display: flex;
flex-wrap: wrap;
margin-right: -15px;
margin-left: -15px; }
.no-gutters {
margin-right: 0;
margin-left: 0; }
.no-gutters > .col,
.no-gutters > [class*="col-"] {
padding-right: 0;
padding-left: 0; }
.col-1, .col-2, .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-10, .col-11, .col-12, .col,
.col-auto {
position: relative;
width: 100%;
min-height: 1px;
padding-right: 15px;
padding-left: 15px; }
.col {
flex-basis: 0;
flex-grow: 1;
max-width: 100%; }
.col-auto {
flex: 0 0 auto;
width: auto;
max-width: none; }
.col-1 {
flex: 0 0 8.33333%;
max-width: 8.33333%; }
.col-2 {
flex: 0 0 16.66667%;
max-width: 16.66667%; }
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flex: 0 0 25%;
max-width: 25%; }
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flex: 0 0 33.33333%;
max-width: 33.33333%; }
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flex: 0 0 41.66667%;
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flex: 0 0 50%;
max-width: 50%; }
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flex: 0 0 58.33333%;
max-width: 58.33333%; }
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flex: 0 0 66.66667%;
max-width: 66.66667%; }
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flex: 0 0 75%;
max-width: 75%; }
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flex: 0 0 83.33333%;
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flex: 0 0 91.66667%;
max-width: 91.66667%; }
.col-12 {
flex: 0 0 100%;
max-width: 100%; }
.order-first {
order: -1; }
.order-last {
order: 13; }
.order-0 {
order: 0; }
.order-1 {
order: 1; }
.order-2 {
order: 2; }
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order: 3; }
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margin-left: 8.33333%; }
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margin-left: 16.66667%; }
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margin-left: 25%; }
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margin-left: 33.33333%; }
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margin-left: 50%; }
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margin-left: 58.33333%; }
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margin-left: 66.66667%; }
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margin-left: 75%; }
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.offset-11 {
margin-left: 91.66667%; }
.d-none {
display: none !important; }
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display: inline !important; }
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display: inline-block !important; }
.d-block {
display: block !important; }
.d-table {
display: table !important; }
.d-table-row {
display: table-row !important; }
.d-table-cell {
display: table-cell !important; }
.d-flex {
display: flex !important; }
.d-inline-flex {
display: inline-flex !important; }
@media print {
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.flex-row {
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flex-direction: column-reverse !important; }
.flex-wrap {
flex-wrap: wrap !important; }
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flex-wrap: nowrap !important; }
.flex-wrap-reverse {
flex-wrap: wrap-reverse !important; }
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flex: 1 1 auto !important; }
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flex-grow: 1 !important; }
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flex-shrink: 1 !important; }
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justify-content: flex-start !important; }
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justify-content: flex-end !important; }
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justify-content: center !important; }
.justify-content-between {
justify-content: space-between !important; }
.justify-content-around {
justify-content: space-around !important; }
.align-items-start {
align-items: flex-start !important; }
.align-items-end {
align-items: flex-end !important; }
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align-items: center !important; }
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align-items: baseline !important; }
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align-items: stretch !important; }
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align-content: flex-start !important; }
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align-content: flex-end !important; }
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align-content: center !important; }
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align-content: space-between !important; }
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align-content: space-around !important; }
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align-content: stretch !important; }
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align-self: auto !important; }
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align-self: flex-start !important; }
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align-self: flex-end !important; }
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align-self: stretch !important; }
</style>
<link href="/californium/style.min.70db6c5bab28c2c10567f73a19b206de5da359fd0b298f46164c638a4c9fb4e4.css" rel="stylesheet">
<link rel="icon" href="/californium/images/logos/Cf_32.png">
<link rel="apple-touch-icon-precomposed" href="/californium/images/logos/Cf_32.png">
<script>
window.syna = {
};
</script>
<script src="/californium/scripts/syna-head.min.947341ad24dd3253dfbe2ce8aeedfa838860075c3fe729f15b49c09e42c71a64.js"></script>
<link rel='stylesheet' href='/californium/css/adopters.css'>
<script src='https://iot.eclipse.org/assets/js/eclipsefdn.adopters.js'></script>
<link rel='stylesheet' href='https://www.eclipse.org/eclipse.org-common/themes/solstice/public/stylesheets/vendor/cookieconsent/cookieconsent.min.css'>
<script src='https://www.eclipse.org/eclipse.org-common/themes/solstice/public/javascript/vendor/cookieconsent/default.min.js'></script></head>
<body class="bg-secondary">
<!-- Navigation --><nav class="overlay fragment navbar navbar-expand-lg py-2 scroll-spy bg-light navbar-light" id="nav" role="navigation" style='position: sticky; top: 0; z-index: 10000 !important;'>
<div class="container">
<a class="navbar-brand py-0" href="/californium/#">Eclipse Californium</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="navbar-collapse justify-content-end collapse show" id="navbarCollapse">
<ul class="navbar-nav"><li class="nav-item ">
<a
class="nav-link anchor"
href="/californium/#getting-started"
>
Getting Started
</a>
</li><li class="nav-item ">
<a
class="nav-link anchor"
href="/californium/#community"
>
Community
</a>
</li>
</ul>
</div>
</div>
<div class="d-none d-lg-block pl-auto">
<a class="btn btn-light ignore-color-change" href="https://github.com/eclipse-californium/californium" role="button" title="Github">
<i class="fab fa-github mr-2"></i>Star</a>
</div></nav>
<div class="scroll-to-top bg-primary has-font-icon"
title="Back to top"
><i class="fas fa-angle-up"></i><span class="sr-only">Back to top</span>
</div>
<style>
:root {
--header-height: 56px;
}
</style>
<!-- Items -->
<section id="features" class="fragment ">
<div class="container-fluid bg-dark ">
<div class="container py-5 ">
<div class="title-container row mx-0">
<div class="title col px-0 text-center text-white">
<h2>Eclipse Californium™</h2>
</div>
</div>
<div class="row justify-content-center align-items-stretch items">
<div class="col-md-4 items-column">
<div class="row image justify-content-center align-items-center">
<span class="fa-stack fa-3x m-2" title="CoAP in Java">
<i class="fas fa-circle fa-stack-2x text-primary"></i>
<i class="fab fa-java fa-stack-1x fa-inverse"></i>
<span class="sr-only">CoAP in Java</span>
</span>
</div>
<div class="row justify-content-center text-center">
<h4 class="mb-3 text-secondary">CoAP in Java</h4>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-secondary">
<p>Californium is a powerful CoAP framework targeting back-end services communicating with smaller Internet of Things devices.
Stronger Internet of Things devices may use Californium as well.
It provides a convenient API for RESTful Web services that support all of CoAP’s features.</p>
</div>
</div>
</div>
<div class="col-md-4 items-column">
<div class="row image justify-content-center align-items-center">
<span class="fa-stack fa-3x m-2" title="Standards compliant">
<i class="fas fa-circle fa-stack-2x text-primary"></i>
<i class="fas fa-thumbs-up fa-stack-1x fa-inverse"></i>
<span class="sr-only">Standards compliant</span>
</span>
</div>
<div class="row justify-content-center text-center">
<h4 class="mb-3 text-secondary">Standards compliant</h4>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-secondary">
<p>Californium has been running code for the IETF and is passing all ETSI Plugtest test specifications.</p>
</div>
</div>
</div>
<div class="col-md-4 items-column">
<div class="row image justify-content-center align-items-center">
<span class="fa-stack fa-3x m-2" title="Perfect for IoT cloud services">
<i class="fas fa-circle fa-stack-2x text-primary"></i>
<i class="fas fa-cloud fa-stack-1x fa-inverse"></i>
<span class="sr-only">Perfect for IoT cloud services</span>
</span>
</div>
<div class="row justify-content-center text-center">
<h4 class="mb-3 text-secondary">Perfect for IoT cloud services</h4>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-secondary">
<p>Californium has an extremely scalable architecture and outperforms high-performance HTTP servers.
CoAP’s low overhead allows to handle millions of IoT devices with a single service instance.
The flexible concurrency model allows to implement whatever is best for your application.</p>
</div>
</div>
</div></div>
</div>
</div>
</section>
<!-- Item -->
<section id="core" class="fragment ">
<div class="container-fluid bg-light ">
<div class="container py-5 ">
<div class="row align-items-center text-center justify-content-start text-lg-left">
<div class="col-12 order-lg-12 pl-lg-5 col-lg-8">
<div class="row pb-3">
<div class="col-12 text-body">
<h2>Californium (Cf) Core</h2>
</div>
</div>
<div class="col-12 text-center d-lg-none pb-4 order-lg-1 mt-lg-5 mr-lg-auto col-lg-4">
<div class="row">
<div class="col-12">
<img src="/californium/images/logos/Cf_256.png" class="img-fluid p-2" alt="Californium (Cf) Core">
</div>
</div>
</div><div class="row text-left">
<div class="col-12">
<div class="mb-0 text-body"><p>The project is divided into five sub-projects. The Californium (Cf) Core provides the central framework with the protocol implementation to build your Internet of Things applications. The repository also includes example projects to get you started. All Californium sources are hosted on GitHub, so you can easily contribute through pull requests.</p>
<p>Californium (Cf) is dual-licensed under EPL and EDL. The latter is a BSD-like license, which means the Cf CoAP framework can be used together with proprietary code to implement your IoT product!</p>
<p>Cf is available from Maven Central and very easy to consume in your Java project. We have got your back covered from OSGi wrapper to HTTP-CoAP cross-proxy to advanced test suites that have been used at the ETSI Plugtests.</p>
<p><a href="https://www.rfc-editor.org/rfc/rfc7252.html">RFC 7252</a>, <a href="https://www.rfc-editor.org/rfc/rfc7641.html">RFC 7641</a>, <a href="https://www.rfc-editor.org/rfc/rfc7959.html">RFC 7959</a>.</p>
</div>
</div>
</div>
<div class="col-12 text-center mb-2 text-lg-right">
<a class="btn btn-lg m-2
btn-primary" href="https://github.com/eclipse/californium/tree/main/californium-core#californium-cf---coap-core">Introduction</a>
<a class="btn btn-lg m-2
btn-primary" href="https://github.com/eclipse/californium">Repository</a>
</div></div>
<div class="col-12 order-lg-1 mr-lg-auto col-lg-4">
<div class="row justify-content-center">
<div class="col-12 text-center d-none d-lg-inline">
<img src="/californium/images/logos/Cf_256.png" class="img-fluid p-2" alt="Californium (Cf) Core">
</div>
</div>
</div>
</div>
</div>
</div>
</section>
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<h2>Element-Connector</h2>
</div>
</div>
<div class="col-12 text-center d-lg-none pb-4 order-lg-12 mt-lg-5 ml-lg-auto col-lg-4">
<div class="row">
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<span class="fa-stack fa-4x" title="Element-Connector">
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<i class="fas fa-link fa-stack-1x fa-inverse"></i>
<span class="sr-only">Element-Connector</span>
</span>
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<div class="col-12">
<div class="mb-0 text-body"><p>The element-connector abstracts from the different transports CoAP can use.
It provides the basic UDPConnector as well as the interface to implement new connectors like the DtlsConnector of Scandium.
<br>
It is also the place for common components and utilities, e.g to read certificate based credentials.
Since version 3.0 this includes also the new configuration.</p>
</div>
</div>
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<div class="col-12 text-center mb-2 text-lg-left">
<a class="btn btn-lg m-2
btn-primary" href="https://github.com/eclipse/californium/tree/main/element-connector#element-connector">Introduction</a>
<a class="btn btn-lg m-2
btn-primary" href="https://github.com/eclipse/californium/tree/main/element-connector">Repository</a>
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<span class="fa-stack fa-4x" title="Element-Connector">
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<span class="sr-only">Element-Connector</span>
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<h2>Getting Started</h2>
</div>
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<div class="col-12 text-secondary">
<h5>Learn how to use Californium</h5>
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<div class="col-12">
<div class="mb-0 text-secondary"><p>The Internet of Things if growing, but how can you build your own connected objects?
Together with MQTT, CoAP is one of the popular IoT protocols.
It provides answers to the typical IoT constraints: it is bandwidth efficient and fits
in constrained embedded environment while providing friendly and discoverable RESTful API.</p>
</div>
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<div class="col-12 text-center mb-2 text-lg-right">
<a class="btn btn-lg m-2
btn-primary" href="http://goo.gl/LLQ03w">Take the Tutorial</a>
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<img src="/californium/_index/tutorial.jpg" class="img-fluid p-2" alt="Getting Started">
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</section>
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<section id="scandium" class="fragment ">
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<h2>Scandium (Sc)</h2>
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<div class="mb-0 text-body"><p>The Scandium (Sc) sub-module provides security for Californium. It implements DTLS 1.2 to secure your application
through ECC with pre-shared keys, certificates, or raw public keys. It comes with many DTLS extensions, amoung them the DTLS 1.2 Connection ID.
<br>
Start making your exciting experience with an mature DTLS 1.2 solution, implemented for the Internet of Things.</p>
<p><a href="https://www.rfc-editor.org/rfc/rfc6347.html">RFC 6347</a>,
<a href="https://www.rfc-editor.org/rfc/rfc7250.html">RFC 7250</a>,
<a href="https://www.rfc-editor.org/rfc/rfc9146.html">RFC 9146</a>.</p>
</div>
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</div>
<div class="col-12 text-center mb-2 text-lg-right">
<a class="btn btn-lg m-2
btn-primary" href="https://github.com/eclipse/californium/tree/main/scandium-core#scandium-sc---security-for-californium">Introduction</a>
<a class="btn btn-lg m-2
btn-primary" href="https://github.com/eclipse/californium/tree/main/scandium-core">Repository</a>
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<img src="/californium/images/logos/Sc_256.png" class="img-fluid p-2" alt="Scandium (Sc)">
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<h2>Installation Options</h2>
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<div class="col-md-4 items-column">
<div class="row image justify-content-center align-items-center">
<a href="https://github.com/eclipse/californium/tree/main/demo-apps/cf-unix-setup#californium-as-old-style-unix-systemd-service" class="col align-items-center d-flex flex-column header text-body">
<span class="fa-stack fa-3x m-2" title="(Cloud-)VM">
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<i class="fas fa-server fa-stack-1x fa-inverse"></i>
<span class="sr-only">(Cloud-)VM</span>
</span>
</a>
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<a href="https://github.com/eclipse/californium/tree/main/demo-apps/cf-unix-setup#californium-as-old-style-unix-systemd-service" class="col justify-content-between d-flex flex-column header text-body">
<h4 class="mb-3 text-body">(Cloud-)VM</h4>
</a>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-body">
<p>Californium is easy to install as unix systemd service. Instructions for manual installation are provided. It supports DTLS graceful restart providing a unique experience using encryption for the Internet of Things.
<br>
For cloud-VMs, using cloudinit makes the installation even easier. Finally, install scripts are provided, which enables you to start your own server within minutes.</p>
<p><a href="https://github.com/eclipse/californium/tree/main/demo-apps/cf-extplugtest-server#benchmarks---dtls-graceful-restart">DTLS graceful restart</a>,<br>
<a href="https://github.com/eclipse/californium/tree/main/demo-apps/cf-unix-setup#cloud-init---automatic-cloud-vm-installation">cloudinit</a>, <a href="https://github.com/eclipse/californium/tree/main/demo-apps/cf-unix-setup#installation-on-exoscale-cloud">install scripts</a>.</p>
</div>
</div>
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<div class="row image justify-content-center align-items-center">
<a href="https://github.com/eclipse/californium/wiki/Californium-as-k8s-service" class="col align-items-center d-flex flex-column header text-body">
<span class="fa-stack fa-3x m-2" title="Kubernetes">
<i class="fas fa-circle fa-stack-2x text-primary"></i>
<i class="fas fa-globe fa-stack-1x fa-inverse"></i>
<span class="sr-only">Kubernetes</span>
</span>
</a>
</div>
<div class="row justify-content-center text-center">
<a href="https://github.com/eclipse/californium/wiki/Californium-as-k8s-service" class="col justify-content-between d-flex flex-column header text-body">
<h4 class="mb-3 text-body">Kubernetes</h4>
</a>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-body">
<p>Californium runs on k8s. Extensions to be used with k8s are provided in the . For simple single pod deployments it supports a Blue/Green update with DTLS graceful restart simply on updating the image. For multiple pod deployments it supports additionally DTLS Connection ID Cluster.<br>
Unleash the power, prepare for huge numbers of devices and plenty messages.</p>
<p><a href="https://github.com/eclipse/californium/tree/main/cf-utils/cf-cluster#californium-cf---k8s-support">k8s module</a>,
<a href="https://github.com/eclipse/californium/blob/main/cf-utils/cf-cluster/README.md#k8s-bluegreen-update-with-dtls-graceful-restart">Blue/Green Update with DTLS graceful restart</a>,
<a href="https://github.com/eclipse/californium/blob/main/cf-utils/cf-cluster/README.md#californium-cf---k8s-built-in-support-for-dtls-connection-id-cluster">DTLS Connection ID Cluster</a>.</p>
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</div></div>
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</div>
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<!-- Items -->
<section id="components" class="fragment ">
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<h2>More Components</h2>
</div>
</div><div class="subtitle-container row mx-0">
<div class="subtitle col pt-4 pb-0 px-0 text-center text-body">
<h5>Beyond the basics</h5>
</div>
</div>
<div class="row justify-content-center align-items-stretch items">
<div class="col-md-4 items-column">
<div class="row image justify-content-center align-items-center">
<a href="https://github.com/eclipse/californium.tools" class="col align-items-center d-flex flex-column header text-body">
<span class="fa-stack fa-3x m-2" title="Tools">
<i class="fas fa-circle fa-stack-2x text-primary"></i>
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<span class="sr-only">Tools</span>
</span>
</a>
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<a href="https://github.com/eclipse/californium.tools" class="col justify-content-between d-flex flex-column header text-body">
<h4 class="mb-3 text-body">Tools</h4>
</a>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-body">
<p>This repository provides CoAP tools that also serve as examples. Use our cf-client to interact with your devices from the command line, or the cf-browser to benefit from the UI. Both share a rich set of CLI arguments, enable to prepare to exchange messages in many different ways.</p>
<p><a href="https://github.com/eclipse/californium.tools/tree/main/cf-client#cf-client">cf-client</a>,
<a href="https://github.com/eclipse/californium.tools/tree/main/cf-browser#cf-browser">cf-browser</a>.</p>
</div>
</div>
</div>
<div class="col-md-4 items-column">
<div class="row image justify-content-center align-items-center">
<a href="https://github.com/eclipse/californium/tree/main/element-connector-tcp-netty" class="col align-items-center d-flex flex-column header text-body">
<span class="fa-stack fa-3x m-2" title="TCP">
<i class="fas fa-circle fa-stack-2x text-primary"></i>
<i class="fas fa-pause fa-stack-1x fa-inverse"></i>
<span class="sr-only">TCP</span>
</span>
</a>
</div>
<div class="row justify-content-center text-center">
<a href="https://github.com/eclipse/californium/tree/main/element-connector-tcp-netty" class="col justify-content-between d-flex flex-column header text-body">
<h4 class="mb-3 text-body">TCP</h4>
</a>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-body">
<p>Experimental CoAP over TCP implementation using netty.io.
Currently/still not completed.</p>
<p><a href="https://github.com/netty/netty">netty.io</a>, <a href="https://www.rfc-editor.org/rfc/rfc8323.html">RFC 8323</a>.</p>
</div>
</div>
</div></div>
</div>
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<h2>Californium’s Wiki</h2>
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<h4 class="mb-3 text-body">Wiki-Home</h4>
</a>
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<div class="row justify-content-center text-center p-2">
<div class=" text-body">
<p>Start of your journey to get common with CoAP and DTLS 1.2.
Collection of links and information, not only limited to Californium’s scope.</p>
</div>
</div>
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<a href="https://github.com/eclipse/californium/wiki/Links-to-CoAP-or-DTLS-1.2-research-information" class="col align-items-center d-flex flex-column header text-body">
<span class="fa-stack fa-3x m-2" title="Research">
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<a href="https://github.com/eclipse/californium/wiki/Links-to-CoAP-or-DTLS-1.2-research-information" class="col justify-content-between d-flex flex-column header text-body">
<h4 class="mb-3 text-body">Research</h4>
</a>
</div>
<div class="row justify-content-center text-center p-2">
<div class=" text-body">
<p>Links to research information about CoAP or DTLS 1.2. Covers related IETF working groups, performance and security topics.</p>
</div>
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<h5>Wanna tell us what you think about Californium? What we can improve? Which feature is missing? Or just discuss architectural issues?</h5>
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<p>The easiest way to tell us about a problem you experience with Californium is by opening an issue on our GitHub page.</p>
<p>Please make sure to search the existing issues for similar symptoms before you open a new issue.</p>
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<p>This is the place where we announce new releases and discuss architectural issues of greater impact.</p>
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