Type Definition paho_mqtt3as_sys::MQTTAsync_deliveryComplete

type MQTTAsync_deliveryComplete = Option<unsafe extern "C" fn(_: *mut c_void, _: MQTTAsync_token)>;

This is a callback function. The client application must provide an implementation of this function to enable asynchronous notification of delivery of messages to the server. The function is registered with the client library by passing it as an argument to MQTTAsync_setCallbacks(). It is called by the client library after the client application has published a message to the server. It indicates that the necessary handshaking and acknowledgements for the requested quality of service (see MQTTAsync_message.qos) have been completed. This function is executed on a separate thread to the one on which the client application is running. @param context A pointer to the context value originally passed to MQTTAsync_setCallbacks(), which contains any application-specific context. @param token The ::MQTTAsync_token associated with the published message. Applications can check that all messages have been correctly published by matching the tokens returned from calls to MQTTAsync_send() and MQTTAsync_sendMessage() with the tokens passed to this callback.