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InfluxDB
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1) The first one is the ESP8266 rtos sdk ( https://github.com/espressif/ESP8266_RTOS_SDK ) I wouldnt recommend this approach for you, as you already work with an Arduino libraries. So with the bare esp8266 rtos sdk you have to do more to achieve your goal.
2) Use the esp8266 Arduino core (https://github.com/esp8266/Arduino). In „/libraries/ESP8266WIFI/„ is all you Need :)
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