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● updated 7d ago2.6.6 · 2026-07-07★ 59653 open issues
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README
Adafruit MQTT Library 
Arduino library for MQTT support, including access to Adafruit IO. Works with the Adafruit FONA, Arduino Yun, ESP8266 Arduino platforms, and anything that supports Arduino's Client interface (like Ethernet shield).
See included examples for how to use the library to access an MQTT service to publish and subscribe to feeds. Note that this does not support the full MQTT spec but is intended to support enough for QoS 0 and 1 publishing.
Depends on the following other libraries depending on the target platform:
-
Adafruit SleepyDog, watchdog library used by FONA code for reliability.
-
Adafruit FONA, required for the FONA hardware.
Future todos:
-
Subscription callbacks
-
remove watchdog
Compatibility
| MCU | Tested Works | Doesn't Work | Not Tested | Notes |
|---|---|---|---|---|
| Atmega328 @ 16MHz | X | |||
| Atmega328 @ 12MHz | X | |||
| Atmega32u4 @ 16MHz | X | |||
| Atmega32u4 @ 8MHz | X | |||
| ESP8266 | X | |||
| Atmega2560 @ 16MHz | X | |||
| ATSAM3X8E | X | |||
| ATSAM21D | X | |||
| ATSAMD51J20 | X | |||
| ATtiny85 @ 16MHz | X | |||
| ATtiny85 @ 8MHz | X | |||
| Intel Curie @ 32MHz | X | |||
| STM32F2 | X |
- ATmega328 @ 16MHz : Arduino UNO, Adafruit Pro Trinket 5V, Adafruit Metro 328, Adafruit Metro Mini
- ATmega328 @ 12MHz : Adafruit Pro Trinket 3V
- ATmega32u4 @ 16MHz : Arduino Leonardo, Arduino Micro, Arduino Yun, Teensy 2.0
- ATmega32u4 @ 8MHz : Adafruit Flora, Bluefruit Micro
- ESP8266 : Adafruit Huzzah
- ATmega2560 @ 16MHz : Arduino Mega
- ATSAM3X8E : Arduino Due
- ATSAM21D : Arduino Zero, M0 Pro
- ATSAMD51J20: Adafruit PyPortal
- ATtiny85 @ 16MHz : Adafruit Trinket 5V
- ATtiny85 @ 8MHz : Adafruit Gemma, Arduino Gemma, Adafruit Trinket 3V
Core symbols most depended-on inside this repo
stringprint
called by 11
Adafruit_MQTT.cpp
connected
called by 3
Adafruit_MQTT_Client.cpp
packetAdditionalLen
called by 2
Adafruit_MQTT.cpp
connect
called by 2
Adafruit_MQTT.cpp
dtostrf
called by 1
Adafruit_MQTT.cpp
strncasecmp
called by 1
Adafruit_MQTT.cpp
subscribe
called by 1
Adafruit_MQTT.cpp
argBegin
called by 1
examples/mqtt_arbitrary_data/python_subscriber/subscriber.py
Shape
Languages
C++90%
Python10%
Modules by API surface
Adafruit_MQTT.cpp33 symbols
Adafruit_MQTT_FONA.h7 symbols
examples/mqtt_arbitrary_data/python_subscriber/subscriber.py6 symbols
Adafruit_MQTT_Client.cpp5 symbols
Adafruit_MQTT.h5 symbols
Adafruit_MQTT_Client.h2 symbols
examples/mqtt_fona/fonahelper.cpp1 symbols
For agents
$ claude mcp add Adafruit_MQTT_Library \
-- python -m otcore.mcp_server <graph>