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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
...so I am using the corresponding firmware with Flash size 8Mbit (512KB+512KB), (firmware was found here: https://github.com/Edragon/esp_firmware/blob/master/Firmware/AT-espressif/NonOS/V1.7.4-ESP8266_NonOS_AT_Bin_V1.7.4.zip):
You should probably use official ESP bin files: https://github.com/espressif/ESP8266_NONOS_SDK
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