Paho Asynchronous MQTT C Client Library: MQTTAsync_responseOptions Struct Reference

| Paho Asynchronous MQTT C Client Library

Data Fields
MQTTAsync_responseOptions Struct Reference

`#include <MQTTAsync.h>`

## Data Fields
char | struct_id [4]
int | struct_version
MQTTAsync_onSuccess * | onSuccess
MQTTAsync_onFailure * | onFailure
void * | context
MQTTAsync_token | token
MQTTAsync_onSuccess5 * | onSuccess5
MQTTAsync_onFailure5 * | onFailure5
MQTTProperties | properties
MQTTSubscribe_options | subscribeOptions
int | subscribeOptionsCount
MQTTSubscribe_options * | subscribeOptionsList

## Detailed Description

Structure to define call options. For MQTT 5.0 there is input data as well as that describing the response method. So there is now also a synonym MQTTAsync_callOptions to better reflect the use. This responseOptions name is kept for backward compatibility.

## Field Documentation

## ◆ struct_id

char struct_id[4]

The eyecatcher for this structure. Must be MQTR

## ◆ struct_version

int struct_version

The version number of this structure. Must be 0 or 1 if 0, no MQTTV5 options

## ◆ onSuccess

MQTTAsync_onSuccess* onSuccess

A pointer to a callback function to be called if the API call successfully completes. Can be set to NULL, in which case no indication of successful completion will be received.

## ◆ onFailure

MQTTAsync_onFailure* onFailure

A pointer to a callback function to be called if the API call fails. Can be set to NULL, in which case no indication of unsuccessful completion will be received.

## ◆ context

void* context

A pointer to any application-specific context. The the context pointer is passed to success or failure callback functions to provide access to the context information in the callback.

## ◆ token

MQTTAsync_token token

A token is returned from the call. It can be used to track the state of this request, both in the callbacks and in future calls such as MQTTAsync_waitForCompletion. This is output only - any change by the application will be ignored.

## ◆ onSuccess5

MQTTAsync_onSuccess5* onSuccess5

A pointer to a callback function to be called if the API call successfully completes. Can be set to NULL, in which case no indication of successful completion will be received.

## ◆ onFailure5

MQTTAsync_onFailure5* onFailure5

A pointer to a callback function to be called if the API call successfully completes. Can be set to NULL, in which case no indication of successful completion will be received.

## ◆ properties

MQTTProperties properties

MQTT V5 input properties

## ◆ subscribeOptions

MQTTSubscribe_options subscribeOptions

## ◆ subscribeOptionsCount

int subscribeOptionsCount

## ◆ subscribeOptionsList

MQTTSubscribe_options* subscribeOptionsList

The documentation for this struct was generated from the following file:

- MQTTAsync.h