Simpler than your ex, smarter than PubSubClient.

InitMQTT is a 🔥 firestarter MQTT wrapper for ESP8266/ESP32 that gets rid of the boring boilerplate. No more client.setCallback(...), loop(), reconnect(), and what-do-I-even-do-with-this-payload[]. We've done the heavy lifting, so you can vibe and code.

• ✅ connect(server, port, user, pass) — dead simple
• ✅ put(topic, value) — for String, int, float
• ✅ putRetain(...) — because memory is good
• ✅ get(topic) — cached last message like your browser tabs
• ✅ subscribe(topic) — easy, no drama
• ✅ setCallback(fn) — get your messages without stress
• ✅ onReconnect(fn) — auto-sync like a king
• ✅ refresh() — your new loop(), but cooler
• 🔒 Uses SSL by default (yes, we care about your security)
• 💡 Works with HiveMQ, Mosquitto, AWS — anything MQTT

❗ Built over PubSubClient, but we made it feel like you're using an API from 2025.

#include <InitMQTT.h>
InitMQTT mqtt;

void onMsg(const char* topic, const char* msg) {
  if (String(topic) == "device/led") {
    digitalWrite(LED_BUILTIN, String(msg) == "1" ? LOW : HIGH);
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  WiFi.begin("YourSSID", "YourPassword");
  while (WiFi.status() != WL_CONNECTED) delay(500);

  mqtt.setCallback(onMsg);
  mqtt.connect("broker.hivemq.com", 1883);
  mqtt.subscribe("device/led");
}

void loop() {
  mqtt.refresh();
}

Yeah, we use it under the hood — but:

• ❌ Setting up callbacks is messy
• ❌ You have to track subscriptions manually
• ❌ You keep copy-pasting reconnect boilerplate
• ❌ You lose retained messages on reboot (unless you fight it)

We fixed that. Like an adult.

Check out examples/usages/ for:

• BasicConnect.ino — Hello MQTT
• ControlLED.ino — LED dance party
• PutRetain.ino — Because state matters
• GetLatestMessage.ino — Read last message like your chat logs
• WithAuth.ino — Secure like your password manager
• OnReconnect.ino — Sync up when MQTT ghosted you

Siam Rayhan instagram.com/thesiamrayhan

• 💬 DM friendly
• 💻 Built it for my own projects, open-sourcing for the homies
• ☁️ Future-ready IoT libraries are coming 🔜

MIT — Use it, fork it, make millions with it. Just don’t sell it back to me 🙃

This ain't just another wrapper. This is InitMQTT — where your ESP talks like it knows what it's doing.

🧠 Less code, more control. You're welcome.