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| <h1>Frequently Asked Questions</h1> |
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| <h4 id="why-do-i-get-http-1-1-503-service-unavailable-when-sending-messages-to-the-http-protocol-adapter">Why do I get <code>HTTP/1.1 503 Service Unavailable</code> when sending messages to the HTTP protocol adapter?</h4> |
| |
| <p>Please check if you have a <a href="/hono/getting-started/#starting-a-consumer">consumer connected</a> |
| and that your consumer is for the same type of message (telemetry or event) that you are sending.</p> |
| |
| <h4 id="why-do-i-get-the-exception-io-vertx-core-vertxexception-openssl-is-not-available-during-startup-of-a-protocol-adapter">Why do I get the exception <code>io.vertx.core.VertxException: OpenSSL is not available</code> during startup of a protocol adapter?</h4> |
| |
| <p>Please check if you have set the property <code>nativeTlsRequired</code> in the protocol adapter’s configuration to <code>true</code>. The default Hono |
| containers do not contain <code>netty-tcnative</code>. To enable this option, please follow the explanation in the |
| <a href="https://www.eclipse.org/hono/docs/admin-guide/secure_communication/#using-openssl |
| ">Admin Guide</a> or build your own container images.</p> |
| |
| <h4 id="why-do-i-see-connectionlimitmanager-connection-limit-value-exceeded-in-the-logs-of-a-protocol-adapter">Why do I see <code>ConnectionLimitManager - Connection limit (<VALUE>) exceeded</code> in the logs of a protocol adapter?</h4> |
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| <p>The configured maximum number of concurrent connections is exceeded and the protocol adapter refuses to accept more |
| connections to prevent running out of resources. This limit is either configured on the protocol adapter |
| (<a href="https://www.eclipse.org/hono/docs/admin-guide/mqtt-adapter-config/#service-configuration |
| ">MQTT</a>, |
| <a href="https://www.eclipse.org/hono/docs/admin-guide/amqp-adapter-config/#service-configuration |
| ">AMQP</a>) or if not set, |
| the protocol adapter determines a reasonable value based on the available resources like memory and CPU.</p> |
| |
| <h4 id="why-do-i-see-memorybasedconnectionlimitstrategy-not-enough-memory-in-the-logs-of-a-protocol-adapter">Why do I see <code>MemoryBasedConnectionLimitStrategy - Not enough memory</code> in the logs of a protocol adapter?</h4> |
| |
| <p>The protocol adapter can not allocate enough memory for handle even a small number of connections reliably. |
| Please provide more memory. To try it anyways, configure the |
| maximum number of concurrent connections, as documented in the Admin Guides of the protocol adapter |
| (<a href="https://www.eclipse.org/hono/docs/admin-guide/mqtt-adapter-config/#service-configuration |
| ">MQTT</a>, |
| <a href="https://www.eclipse.org/hono/docs/admin-guide/amqp-adapter-config/#service-configuration |
| ">AMQP</a>).</p> |
| |
| <h4 id="how-do-i-use-client-certificates-for-authentication">How do I use client certificates for authentication?</h4> |
| |
| <p>Make sure that you are able to connect to the respective protocol adapter with TLS |
| (see the <a href="https://www.eclipse.org/hono/docs/admin-guide/secure_communication/#using-openssl |
| ">Admin Guide</a> for configuration). |
| <a href="https://blog.bosch-si.com/developer/x-509-based-device-authentication-in-eclipse-hono/">Here</a> is an article, that |
| provides a complete walk-through guide for all required steps. |
| Additionally you can use and adapt the script for the creation of demo certificates in the Hono repository. |
| More information can be found in the User Guide of the protocol adapter |
| (<a href="https://www.eclipse.org/hono/docs/user-guide/mqtt-adapter/#authentication |
| ">MQTT</a>, |
| <a href="https://www.eclipse.org/hono/docs/user-guide/http-adapter/#device-authentication |
| ">HTTP</a>).</p> |
| |
| <h2 id="organizational-questions">Organizational Questions</h2> |
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| <h4 id="will-you-add-feature-x-to-hono">Will you add feature <em>x</em> to Hono?</h4> |
| |
| <p>To find out about the future development you can have a look at the <a href="https://www.eclipse.org/hono/community/road-map/">Roadmap</a> or |
| <a href="https://www.eclipse.org/hono/community/get-in-touch/">get in touch</a> with the Hono developers.</p> |
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