Youtube tutorial https://www.youtube.com/playlist?list=PLYvhGlBkeltkMOW5gV37hKd2nmgLuuRt7
Alexa skills to control ESP8266 without opening a router's port/firewal.
In This project you will be able to control ESP8266 with Alexa skills without opening a firewall port or setuping a revers proxy.
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Download this project and unzip.
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Copy following folders to "C:\Program Files (x86)\Arduino\libraries"
arduinoWebSockets
ArduinoJson
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Update and flash your ESP8266 with "ESP8266/ESP8266_WebSocketClient/ESP8266_WebSocketClient.ino"
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Create an Alexa skills and add Heroku app URL as an end-point
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Test and enjoy.