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This is for questions about the official IDE. The open-source IDE makes it easy to write code and upload it to any Arduino board. It runs on Windows, macOS and Linux.

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4 answers
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fatal error: ESP8266WiFi.h: No such file or directory

I used platformio IDE I did "platformio lib install 1101" (http://platformio.org/lib/show/1101/ESP8266wifi), I installed this: http://platformio.org/lib/show/549/WebSockets (follow instructions) I did …
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