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| Connecting Devices |
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| Device Notifications |
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| <li data-nav-id="/hono/docs/1.2/concepts/connection-events/" title="Connection Events" class="dd-item active"> |
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| Connection Events |
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| Device Registry |
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| HTTP Adapter |
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| MQTT Adapter |
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| AMQP Adapter |
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| CoAP Adapter |
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| Kura Adapter |
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| Sigfox Adapter |
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| Auth Server Configuration |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/device-registry-config/" title="Device Registry Configuration" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/device-registry-config/"> |
| Device Registry Configuration |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/device-connection-config/" title="Configuring the Device Connection Service" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/device-connection-config/"> |
| Device Connection Service Configuration |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/http-adapter-config/" title="HTTP Adapter Configuration" class="dd-item "> |
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| HTTP Adapter Configuration |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/amqp-adapter-config/" title="AMQP Adapter Configuration" class="dd-item "> |
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| AMQP Adapter Configuration |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/mqtt-adapter-config/" title="MQTT Adapter Configuration" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/mqtt-adapter-config/"> |
| MQTT Adapter Configuration |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/kura-adapter-config/" title="Kura Adapter Configuration" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/kura-adapter-config/"> |
| Kura Adapter Configuration |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/hono-client-configuration/" title="Hono Client Configuration" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/hono-client-configuration/"> |
| Hono Client Configuration |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/amqp-network-config/" title="AMQP 1.0 Messaging Network Configuration" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/amqp-network-config/"> |
| AMQP 1.0 Messaging Network Configuration |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/secure_communication/" title="Secure Communication" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/secure_communication/"> |
| Secure Communication |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.2/admin-guide/monitoring-tracing-config/" title="Monitoring & Tracing" class="dd-item "> |
| <a href="/hono/docs/1.2/admin-guide/monitoring-tracing-config/"> |
| Monitoring & Tracing |
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| </a> |
| </li> |
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| </ul> |
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| <i class="fas fa-tools"></i> Developer Guide |
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| <li data-nav-id="/hono/docs/1.2/dev-guide/building_hono/" title="Building from Source" class="dd-item "> |
| <a href="/hono/docs/1.2/dev-guide/building_hono/"> |
| Building from Source |
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| </a> |
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| <li data-nav-id="/hono/docs/1.2/dev-guide/amqp_adapter_client/" title="AMQP Adapter Client for Java" class="dd-item "> |
| <a href="/hono/docs/1.2/dev-guide/amqp_adapter_client/"> |
| AMQP Adapter Client for Java |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.2/dev-guide/java_client_consumer/" title="Consuming Messages from Java" class="dd-item "> |
| <a href="/hono/docs/1.2/dev-guide/java_client_consumer/"> |
| Consuming Messages from Java |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.2/dev-guide/custom_http_adapter/" title="Implement a Custom Hono HTTP Protocol Adapter" class="dd-item "> |
| <a href="/hono/docs/1.2/dev-guide/custom_http_adapter/"> |
| Implement a Custom Hono HTTP Protocol Adapter |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.2/api/telemetry/" title="Telemetry API Specification" class="dd-item "> |
| <a href="/hono/docs/1.2/api/telemetry/"> |
| Telemetry API |
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| <li data-nav-id="/hono/docs/1.2/api/event/" title="Event API Specification" class="dd-item "> |
| <a href="/hono/docs/1.2/api/event/"> |
| Event API |
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| <li data-nav-id="/hono/docs/1.2/api/command-and-control/" title="Command & Control API Specification" class="dd-item "> |
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| Command & Control API |
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| Authentication API |
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| <a href="/hono/docs/1.2/deployment/helm-based-deployment/"> |
| Helm based Deployment |
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| <a href="/hono/docs/1.2/deployment/openshift/"> |
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| <a href="/hono/docs/1.2/deployment/create-kubernetes-cluster/"> |
| Setting up a Kubernetes Cluster |
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| <li data-nav-id="/hono/docs/1.2/deployment/resource-limitation/" title="Limiting Resource Usage" class="dd-item "> |
| <a href="/hono/docs/1.2/deployment/resource-limitation/"> |
| Limiting Resource Usage |
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| <a href="/hono/docs/1.2/architecture/"> |
| <i class="fas fa-landmark"></i> Architecture |
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| <a href="/hono/docs/1.2/architecture/component-view/"> |
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| <li data-nav-id="/hono/docs/1.2/architecture/auth/" title="Authentication/Authorization" class="dd-item "> |
| <a href="/hono/docs/1.2/architecture/auth/"> |
| Authentication/Authorization |
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| <section id="shortcuts"> |
| <h3></h3> |
| <ul> |
| |
| <li> |
| <a class="padding" href="https://www.eclipse.org/hono/" title="Hono's Homepage"><i class='fas fa-home'></i> Hono Home</a> |
| </li> |
| |
| <li> |
| <a class="padding" href="https://www.eclipse.org/hono/getting-started/" title="Getting started with Eclipse Hono"><i class='fas fa-plane-departure'></i> Getting Started</a> |
| </li> |
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| </ul> |
| </section> |
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| <section id="prefooter"> |
| <hr/> |
| <ul> |
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| <div id="select-box-wrapper"> |
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| <option id="1.8" value="https://www.eclipse.org/hono/docs/1.8/concepts/connection-events/">1.8</option> |
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| <option id="1.7" value="https://www.eclipse.org/hono/docs/1.7/concepts/connection-events/">1.7</option> |
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| <option id="1.6" value="https://www.eclipse.org/hono/docs/1.6/concepts/connection-events/">1.6</option> |
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| <option id="1.5" value="https://www.eclipse.org/hono/docs/1.5/concepts/connection-events/">1.5</option> |
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| <option id="1.4" value="https://www.eclipse.org/hono/docs/1.4/concepts/connection-events/">1.4</option> |
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| <option id="1.3" value="https://www.eclipse.org/hono/docs/1.3/concepts/connection-events/">1.3</option> |
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| <option id="1.2" value="https://www.eclipse.org/hono/docs/1.2/concepts/connection-events/" selected>1.2</option> |
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| <option id="1.1" value="https://www.eclipse.org/hono/docs/1.1/concepts/connection-events/">1.1</option> |
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| <option id="1.0" value="https://www.eclipse.org/hono/docs/1.0/concepts/connection-events/">1.0</option> |
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| <option id="dev" value="https://www.eclipse.org/hono/docs/dev/concepts/connection-events/">dev</option> |
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| </select> |
| <svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" |
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| </svg> |
| </div> |
| </a> |
| </div> |
| </div> |
| </li> |
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| </ul> |
| </section> |
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| <section id="footer"> |
| |
| |
| <p>© 2021 <a href="https://www.eclipse.org/hono/">The Eclipse Hono Project</a></p> |
| |
| <p> |
| Documentation built with |
| <a href="https://gohugo.io/" target="_blank">Hugo</a> |
| using the |
| <a href="https://github.com/matcornic/hugo-theme-learn" target="_blank">Learn</a> theme. |
| </p> |
| |
| <div class="eclipse-logo"> |
| <a href="https://www.eclipse.org" target="_blank"> |
| <img src="https://www.eclipse.org/hono/docs/images/eclipse_foundation_logo.svg"/> |
| </a> |
| </div> |
| |
| </section> |
| </div> |
| </nav> |
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| <section id="body"> |
| <div id="overlay"></div> |
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| |
| <div class="old-version-hint"> |
| <p>This page refers to version <em>1.2</em>. |
| You might want to use the <a href="https://www.eclipse.org/hono/docs/">current stable</a> version. |
| </p> |
| </div> |
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| <div class="padding highlightable"> |
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| <div> |
| <div id="top-bar"> |
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| <a class="github-link" title='Edit this page' href="https://github.com/eclipse/hono/edit/master/site/documentation/content/concepts/connection-events.md" target="blank"> |
| <i class="fas fa-code-branch"></i> |
| <span id="top-github-link-text">Edit this page</span> |
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| <a href='/hono/docs/1.2/'>Documentation</a> > <a href='/hono/docs/1.2/concepts/'>Concepts</a> > Connection Events |
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| <div id="body-inner"> |
| |
| <h1> |
| |
| Connection Events |
| </h1> |
| |
| |
| |
| |
| |
| <p>Hono’s protocol adapters can use <em>connection events</em> to indicate the connection |
| status of a device. In particular, an adapter can notify downstream components |
| about a newly established connection with a device or about a device having |
| disconnected.</p> |
| <!-- more --> |
| <p>The connection status of devices using stateful protocols like MQTT and AMQP can usually |
| be determined quite easily because these protocols often require peers to explicitly open |
| or close a connection and often also support a kind of heart beat which can be used to |
| determine if a connection is still alive. However, for stateless protocols like HTTP |
| or CoAP, there is no clear definition of what it actually means that a device is |
| <em>connected</em>. It is obvious that a device is connected when it is sending an HTTP request. |
| However, the adapter has no way of knowing if the device has gone to sleep after it has |
| received the adapter’s response to its request.</p> |
| <p>That said, connection events indicating an established connection with a device can |
| usually be taken as face value. However, connection events indicating the disconnection |
| of a device may only represent the protocol adapters view of the device’s connection |
| status. For example, the HTTP adapter might consider a device <em>disconnected</em> because |
| it hasn’t received any requests from the device for some time. However, the device itself |
| might as well be up and running (i.e. not sleeping) and simply have no data worth publishing.</p> |
| <p>The mechanism of firing connection events is pluggable with the default implementation |
| simply forwarding connection status information to the logging framework. |
| Hono also comes with an alternative implementation which forwards connection status |
| information by means of <a href="/hono/docs/1.2/api/event/#connection-event">Connection Events</a> |
| via the <em>Events</em> API.</p> |
| |
| |
| <footer class="footline"> |
| |
| </footer> |
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| </div> |
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