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Projects that require "Secure MQTT" (TLS/SSL) on ESP8266 also require a new SSL certificate + SSL fingerprint every year.
src/wifi/AdafruitIO_ESP8266.h
advising users to upgrade to the ESP32 platform if using SSL/TLS with an Adafruit IO Arduino project.Tested on an Adafruit Feather ESP8266 Huzzah running the publish+subscribe example within this library.