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If you've ever tried to use SPIFFS on the Dev version of the SparkFun ESP8266 Thing, you will quite likely have encountered the error message "SPIFFS Not Defined for SparkFun ESP8266 Thing Dev" as soon as you tried to upload a disk image using the ESP8266 Sketch Data Upload tool from the Arduino environment. This blog has some background info on this, but for those who are impatient, I'll give you the solution first. The Problem The SparkFun ESP8266 Thing Dev board definition is missing some e ...

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