MQTTAsync_successData(3)

💖 MQTTAsync_successData(3) 💖

okay bestie, welcome to the Library Functions Manual entry for MQTTAsync_successData — yes that's the whole NAME section, it's just the struct's name, and honestly? iconic of it to introduce itself that way. no notes. 🎀

This is the little bundle of joy that shows up in your onSuccess response callback when an API call actually worked. slay. ✨

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✨ SYNOPSIS ✨

#include <MQTTAsync.h>

🦋 Data Fields

MQTTAsync_token token
union {
   int qos
   int * qosList
   struct {
      MQTTAsync_message message
      char * destinationName
   } pub
   struct {
      char * serverURI
      int MQTTVersion
      int sessionPresent
   } connect
} alt

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🌸 Detailed Description 🌸

The data returned on completion of a successful API call in the response callback onSuccess. that's it, that's the vibe — this struct is literally the "you did it bestie 🫶" receipt. no cap.

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💅 Field Documentation 💅

MQTTAsync_token token

A token identifying the successful request. Can be used to refer to the request later. it's giving little name tag for your request so you can find it again later, iykyk. 🔥

int qos

For subscribe, the granted QoS of the subscription returned by the server. Also for subscribeMany, if only 1 subscription was requested. yes girl, only the one — if you asked for more, scroll down. 👀

int* qosList

For subscribeMany, if more than one subscription was requested, the list of granted QoSs of the subscriptions returned by the server. it's the group-chat version of qos, basically. 💬

MQTTAsync_message message

the message being sent to the server. 💌

char* destinationName

the topic destination for the message. where it's going, periodt. 📍

struct { ... } pub

For publish, the message being sent to the server. the whole message + destinationName situation above lives inside this one, bestie. 🎁

char* serverURI

the connection string of the server. 🌐

int MQTTVersion

the version of MQTT being used. lowkey important to know which flavour you're on. 🍓

int sessionPresent

the session present flag returned from the server. 🚩

struct { ... } connect

(this one's a nested struct, no extra description — it's just the container holding serverURI, MQTTVersion and sessionPresent together. she's a box. a cute one. 🎀)

union { ... } alt

A union of the different values that can be returned for subscribe, unsubscribe and publish. it's a union so it's one of these at a time, not all of them — do not come for me assuming otherwise. 💀

⚠️ real talk: alt is a union, so depending on which call succeeded you get qos/qosList, or pub, or connect — not the whole squad at once. read the field that matches your request, bestie.

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👑 Author 👑

Generated automatically by Doxygen for Paho Asynchronous MQTT C Client Library from the source code. so it wasn't even hand-written, it was born this way. main character energy fr fr. ⭐

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and that's the whole page, babes — no filler, no crumbs. 🧚

Paho Asynchronous MQTT C Client Library — page generated Tue Jun 2 2026 00:00:00, and you just read MQTTAsync_successData(3). go forth and handle your callbacks responsibly. 💜🌈💖