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| Device Identity |
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| <li data-nav-id="/hono/docs/1.0/concepts/device-notifications/" title="Device Notifications" class="dd-item active"> |
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| Device Notifications |
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| <li data-nav-id="/hono/docs/1.0/user-guide/device-registry/" title="Device Registry" class="dd-item "> |
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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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| Kura Adapter |
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| Sigfox Adapter |
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| Load Tests with JMeter |
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| Common Configuration |
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| Auth Server Configuration |
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| Device Registry Configuration |
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| <li data-nav-id="/hono/docs/1.0/admin-guide/device-connection-config/" title="Configuring the Device Connection Service" class="dd-item "> |
| <a href="/hono/docs/1.0/admin-guide/device-connection-config/"> |
| Device Connection Service Configuration |
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| <li data-nav-id="/hono/docs/1.0/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/1.0/admin-guide/amqp-adapter-config/" title="AMQP Adapter Configuration" class="dd-item "> |
| <a href="/hono/docs/1.0/admin-guide/amqp-adapter-config/"> |
| AMQP Adapter Configuration |
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| <li data-nav-id="/hono/docs/1.0/admin-guide/mqtt-adapter-config/" title="MQTT Adapter Configuration" class="dd-item "> |
| <a href="/hono/docs/1.0/admin-guide/mqtt-adapter-config/"> |
| MQTT Adapter Configuration |
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| <li data-nav-id="/hono/docs/1.0/admin-guide/kura-adapter-config/" title="Kura Adapter Configuration" class="dd-item "> |
| <a href="/hono/docs/1.0/admin-guide/kura-adapter-config/"> |
| Kura Adapter Configuration |
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| <li data-nav-id="/hono/docs/1.0/admin-guide/hono-client-configuration/" title="Hono Client Configuration" class="dd-item "> |
| <a href="/hono/docs/1.0/admin-guide/hono-client-configuration/"> |
| Hono Client Configuration |
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| <li data-nav-id="/hono/docs/1.0/admin-guide/amqp-network-config/" title="AMQP 1.0 Messaging Network Configuration" class="dd-item "> |
| <a href="/hono/docs/1.0/admin-guide/amqp-network-config/"> |
| AMQP 1.0 Messaging Network Configuration |
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| </a> |
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| <li data-nav-id="/hono/docs/1.0/admin-guide/secure_communication/" title="Secure Communication" class="dd-item "> |
| <a href="/hono/docs/1.0/admin-guide/secure_communication/"> |
| Secure Communication |
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| <a href="/hono/docs/1.0/admin-guide/monitoring-tracing-config/"> |
| Monitoring & Tracing |
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| <i class="fas fa-tools"></i> Developer Guide |
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| <li data-nav-id="/hono/docs/1.0/dev-guide/building_hono/" title="Building from Source" class="dd-item "> |
| <a href="/hono/docs/1.0/dev-guide/building_hono/"> |
| Building from Source |
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| <li data-nav-id="/hono/docs/1.0/dev-guide/java_client_consumer/" title="Consuming Messages from Java" class="dd-item "> |
| <a href="/hono/docs/1.0/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/1.0/dev-guide/custom_http_adapter/" title="Implement a Custom Hono HTTP Protocol Adapter" class="dd-item "> |
| <a href="/hono/docs/1.0/dev-guide/custom_http_adapter/"> |
| Implement a Custom Hono HTTP Protocol Adapter |
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| </a> |
| </li> |
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| </ul> |
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| <i class='fas fa-plug'></i> API |
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| <li data-nav-id="/hono/docs/1.0/api/telemetry/" title="Telemetry API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/telemetry/"> |
| Telemetry API |
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| </li> |
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| <li data-nav-id="/hono/docs/1.0/api/event/" title="Event API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/event/"> |
| Event API |
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| <li data-nav-id="/hono/docs/1.0/api/command-and-control/" title="Command & Control API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/command-and-control/"> |
| Command & Control API |
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| </a> |
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| <li data-nav-id="/hono/docs/1.0/api/tenant/" title="Tenant API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/tenant/"> |
| Tenant API |
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| </a> |
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| <li data-nav-id="/hono/docs/1.0/api/device-connection/" title="Device Connection API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/device-connection/"> |
| Device Connection API |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.0/api/device-registration/" title="Device Registration API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/device-registration/"> |
| Device Registration API |
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| </a> |
| </li> |
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| <li data-nav-id="/hono/docs/1.0/api/credentials/" title="Credentials API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/credentials/"> |
| Credentials API |
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| <li data-nav-id="/hono/docs/1.0/api/authentication/" title="Authentication API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/authentication/"> |
| Authentication API |
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| <li data-nav-id="/hono/docs/1.0/api/management/" title="Device Registry Management API Specification" class="dd-item "> |
| <a href="/hono/docs/1.0/api/management/"> |
| Device Registry Management API |
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| </li> |
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| <li><a href="#time-until-disconnect-notification">Time until Disconnect Notification</a> |
| <ul> |
| <li><a href="#determining-a-device-s-connection-status">Determining a Device’s Connection Status</a></li> |
| <li><a href="#source-of-the-ttd-value">Source of the <em>ttd</em> Value</a></li> |
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| <h1>Device Notifications</h1> |
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| |
| <p><em>Business Applications</em> need to know when an attempt to send a command to device is feasible, e.g. because the device is then known to be connected to a protocol adapter. <em>Devices</em> and <em>Protocol Adapters</em> can indicate to <em>Business Applications</em> a device’s intent to e.g. receive commands using specific <em>notifications</em>.</p> |
| |
| <h2 id="time-until-disconnect-notification">Time until Disconnect Notification</h2> |
| |
| <p><em>Devices</em> and <em>Protocol Adapters</em> can notify an application about the fact that a device is connected and ready to receive one or more commands by means of including a <em>time ‘til disconnect</em> (<em>ttd</em>) property in telemetry or event messages.</p> |
| |
| <p>The <em>ttd</em> property value indicates the time that the device will stay connected to the protocol adapter. |
| Using this value together with the <em>creation-time</em> of the message, an application can determine whether an attempt to send a command to the device has a reasonable chance of succeeding. |
| The <em>ttd</em> property can be included in any regular telemetry or event message. However, if a device does not have any telemetry data or event to upload to the adapter, it can also use an <a href="/hono/docs/1.0/api/event/#empty-notification">empty notification</a> instead.</p> |
| |
| <p>Hono includes utility classes that application developers can use to register a callback to be notified when a device sends a <em>ttd</em> notification. |
| See Hono’s example module for details where such a notification callback is used. |
| Please refer to the <a href="/hono/docs/1.0/api/telemetry/">Telemetry API</a> and the <a href="/hono/docs/1.0/api/event/">Event API</a> for further details.</p> |
| |
| <p>The following table defines the possible values of the <em>ttd</em> property and their semantics:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th align="left">TTD</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| |
| <tbody> |
| <tr> |
| <td align="left">> 0</td> |
| <td align="left">The value indicates the number of seconds that the device will stay connected. Devices using a stateless protocol like HTTP will be able to receive a single command only before disconnecting.</td> |
| </tr> |
| |
| <tr> |
| <td align="left">-1</td> |
| <td align="left">The device is now connected (i.e. available to receive upstream messages) until further notice.</td> |
| </tr> |
| |
| <tr> |
| <td align="left">0</td> |
| <td align="left">The device is now disconnected (i.e. not available anymore to receive upstream messages).</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h3 id="determining-a-device-s-connection-status">Determining a Device’s Connection Status</h3> |
| |
| <p>An application receiving a downstream message containing a <em>ttd</em> property can check if the device is currently connected |
| (and thus ready to receive a command) by</p> |
| |
| <ul> |
| <li>adding the <em>ttd</em> value to the <em>creation-time</em> to determine the <em>expiration</em> time, and then</li> |
| <li>comparing the <em>current</em> time with the <em>expiration</em> time</li> |
| </ul> |
| |
| <p>If the <em>current</em> time is <em>after</em> the <em>expiration</em> time, the device should be assumed to already have disconnected again.</p> |
| |
| <h3 id="source-of-the-ttd-value">Source of the <em>ttd</em> Value</h3> |
| |
| <p>While it seems to be natural that a device itself indicates when it is ready to receive a command, it may not always be |
| possible or desirable to do so. |
| A device could e.g. be not capable to specify the value for <em>ttd</em> in it’s message, or all devices of a particular setup |
| would always use the same value for <em>ttd</em>, so it would not make much sense to provide this value always again. |
| Additionally different protocols may or may not let a sender set specific values for a message, so a device using a |
| specific protocol may not be able to provide a value for the <em>ttd</em> property at all. |
| For these reasons there are (resp. may be) additional ways of setting the value of <em>ttd</em>:</p> |
| |
| <ul> |
| <li>Hono’s Tenant and Device Registration APIs support the inclusion of default values for application-properties in the |
| AMQP 1.0 message. By these means a device can be configured to always have a specific value for <em>ttd</em>.</li> |
| <li>In a future extension there may be a configuration value per tenant and protocol adapter that sets the value of <em>ttd</em> |
| if it was not provided by other means already (like provided to the protocol adapter or by setting a default value). |
| <br /></li> |
| </ul> |
| |
| <h3 id="hono-s-http-protocol-adapter">Hono’s HTTP protocol adapter</h3> |
| |
| <p>Hono’s HTTP protocol adapter supports the setting of the <em>ttd</em> value in requests explicitly - please refer to the |
| <a href="/hono/docs/1.0/user-guide/http-adapter/">HTTP Adapter</a> for details. |
| Alternatively the default property values for devices from the Device Registry can be used (described above).</p> |
| |
| <h3 id="hono-s-mqtt-protocol-adapter">Hono’s MQTT protocol adapter</h3> |
| |
| <p>The MQTT protocol adapter automatically sends a <em>Time until disconnect notification</em> with a <em>ttd</em> value of <code>-1</code> |
| for a device that subscribes to the appropriate command topic (refer to the <a href="/hono/docs/1.0/user-guide/mqtt-adapter/">MQTT Adapter user guide</a> for details).</p> |
| |
| <p>When a device unsubscribes again, the adapter automatically sends a <em>Time until disconnect notification</em> with a <em>ttd</em> value of <code>0</code>.</p> |
| |
| <h3 id="examples">Examples</h3> |
| |
| <p>The following sequence diagram shows a <em>Time until disconnect notification</em> while sending a telemetry message downstream |
| via the HTTP protocol adapter:</p> |
| |
| <figure> |
| <img src="../device_commandReadinessImplicit.svg"/> <figcaption> |
| <h4>Device command readiness with telemetry data</h4> |
| </figcaption> |
| </figure> |
| |
| |
| <p>The following sequence diagram shows a <em>Time until disconnect notification</em> by sending an empty event message downstream |
| via the HTTP protocol adapter:</p> |
| |
| <figure> |
| <img src="../device_commandReadinessExplicit.svg"/> <figcaption> |
| <h4>Device command readiness with explicit event</h4> |
| </figcaption> |
| </figure> |
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