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arduino-cli/libraries/Adafruit_MQTT_Library/README.md

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+# Adafruit MQTT Library [![Build Status](https://github.com/adafruit/Adafruit_MQTT_Library/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_MQTT_Library/actions)
+
+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](https://github.com/adafruit/Adafruit_SleepyDog), watchdog
+   library used by FONA code for reliability.
+
+   - [Adafruit FONA](https://github.com/adafruit/Adafruit_FONA_Library), required for
+   the FONA hardware.
+
+Future todos:
+
+   - Subscription callbacks
+
+   - remove watchdog
+
+<!-- START COMPATIBILITY TABLE -->
+
+## 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
+
+<!-- END COMPATIBILITY TABLE -->