MQTTAsync_successData5(3)

💖 MQTTAsync_successData5 💖

okay bestie, welcome to the MQTTAsync_successData5 page from the Library Functions Manual 🎀 this is a lil struct that shows up when your async MQTT call goes off without a hitch. no cap. let's get into it ✨

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✨ SYNOPSIS ✨

#include <MQTTAsync.h>

🌸 Data Fields 🌸

char struct_id [4]
int struct_version
MQTTAsync_token token
enum MQTTReasonCodes reasonCode
MQTTProperties properties
union {
   struct {
      int reasonCodeCount
      enum MQTTReasonCodes * reasonCodes
   } sub
   struct {
      MQTTAsync_message message
      char * destinationName
   } pub
   struct {
      char * serverURI
      int MQTTVersion
      int sessionPresent
   } connect
   struct {
      int reasonCodeCount
      enum MQTTReasonCodes * reasonCodes
   } unsub
} alt

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💅 Detailed Description 💅

The data returned on completion of a successful API call in the response callback onSuccess. so like, when your call ate and everyone's happy, this is the lil goodie bag you get handed 🫶

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🦋 Field Documentation 🦋

• char struct_id[4] — the eyecatcher for this structure. Will be MQSD. it's giving ✨name tag✨ so the lib knows what it's looking at.
• int struct_version — the version number of this structure. Will be 0.
• MQTTAsync_token token — a token identifying the successful request. can be used to refer to the request later 🔥 (iykyk — hold onto it).
• enum MQTTReasonCodes reasonCode — MQTT V5 reason code returned.
• MQTTProperties properties — MQTT V5 properties returned, if any.
• int reasonCodeCount — the number of reason codes in the reasonCodes array.
• enum MQTTReasonCodes* reasonCodes — an array of reasonCodes.
• struct { ... } sub — For subscribeMany, the list of reasonCodes returned by the server.
• MQTTAsync_message message — the message being sent to the server.
• char* destinationName — the topic destination for the message.
• struct { ... } pub — For publish, the message being sent to the server.
• char* serverURI — the connection string of the server.
• int MQTTVersion — the version of MQTT being used.
• int sessionPresent — the session present flag returned from the server.
• struct { ... } connect — 👀 the connect one, bestie.
• struct { ... } unsub — For unsubscribeMany, the list of reasonCodes returned by the server.
• union { ... } alt — a union of the different values that can be returned for subscribe, unsubscribe and publish. it's giving 💀 pick a lane energy — it's a union, so only one of them is actually real at a time.

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👑 Author 👑

Generated automatically by Doxygen for Paho Asynchronous MQTT C Client Library from the source code.

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and that's the whole page, periodt 💜 no notes. this lil slice of the Paho Asynchronous MQTT C Client Library docs is stamped Tue Jun 2 2026 00:00:00 — go forth and slay your callbacks, bestie 🌈⭐