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| <h1 class='fqn'><span class='in-band'>Function <a href='index.html'>paho_mqtt3as_sys</a>::<wbr><a class="fn" href=''>MQTTAsync_setCallbacks</a></span><span class='out-of-band'><span id='render-detail'> |
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| <pre class='rust fn'>pub unsafe extern "C" fn MQTTAsync_setCallbacks(<br> handle: <a class="type" href="../paho_mqtt3as_sys/type.MQTTAsync.html" title="type paho_mqtt3as_sys::MQTTAsync">MQTTAsync</a>, <br> context: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a><a class="enum" href="https://doc.rust-lang.org/nightly/std/os/raw/enum.c_void.html" title="enum std::os::raw::c_void">c_void</a>, <br> cl: <a class="type" href="../paho_mqtt3as_sys/type.MQTTAsync_connectionLost.html" title="type paho_mqtt3as_sys::MQTTAsync_connectionLost">MQTTAsync_connectionLost</a>, <br> ma: <a class="type" href="../paho_mqtt3as_sys/type.MQTTAsync_messageArrived.html" title="type paho_mqtt3as_sys::MQTTAsync_messageArrived">MQTTAsync_messageArrived</a>, <br> dc: <a class="type" href="../paho_mqtt3as_sys/type.MQTTAsync_deliveryComplete.html" title="type paho_mqtt3as_sys::MQTTAsync_deliveryComplete">MQTTAsync_deliveryComplete</a><br>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/os/raw/type.c_int.html" title="type std::os::raw::c_int">c_int</a></pre><div class='docblock'><p>This function sets the global callback functions for a specific client. |
| If your client application doesn't use a particular callback, set the |
| relevant parameter to NULL. Any necessary message acknowledgements and |
| status communications are handled in the background without any intervention |
| from the client application. If you do not set a messageArrived callback |
| function, you will not be notified of the receipt of any messages as a |
| result of a subscription.</p> |
| |
| <p><b>Note:</b> The MQTT client must be disconnected when this function is |
| called. |
| @param handle A valid client handle from a successful call to |
| MQTTAsync_create(). |
| @param context A pointer to any application-specific context. The |
| the <i>context</i> pointer is passed to each of the callback functions to |
| provide access to the context information in the callback. |
| @param cl A pointer to an MQTTAsync_connectionLost() callback |
| function. You can set this to NULL if your application doesn't handle |
| disconnections. |
| @param ma A pointer to an MQTTAsync_messageArrived() callback |
| function. You can set this to NULL if your application doesn't handle |
| receipt of messages. |
| @param dc A pointer to an MQTTAsync_deliveryComplete() callback |
| function. You can set this to NULL if you do not want to check |
| for successful delivery. |
| @return ::MQTTASYNC_SUCCESS if the callbacks were correctly set, |
| ::MQTTASYNC_FAILURE if an error occurred.</p> |
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