docs(ssl): Update TLS/SSL certificate fingerprint instructions#177
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docs(ssl): Update TLS/SSL certificate fingerprint instructions#177
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brentru
approved these changes
Jan 21, 2026
| * SSL certificate every year. If adding Secure MQTT to your ESP8266 project is | ||
| * important - please switch to using the modern ESP32 (and related models) | ||
| * instead of the ESP8266 to avoid updating the SSL fingerprint every year. | ||
| * instead of the ESP8266 to avoid updating the SSL fingerprint every 6months. |
| // latest fingerprint can be generated with | ||
| // echo | openssl s_client -connect io.adafruit.com:443 | openssl x509 | ||
| // -fingerprint -noout | ||
| /* NB: io.adafruit.com TLS/SSL certificate changes every 6months, and pinning |
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Certificates for IO.adafruit.com are changing to a 6month validity, and it's felt that fingerprinting should no longer be recommended, but instructions updated as a large number of esp8266 users still exist on the IO platform.
Relates to:
https://3.basecamp.com/3732686/buckets/17625714/todos/9458087406