This board have the chip EPS8266EX,
2MB (16Mb) SPI flash memory and a relay in pin 5. Have you a firmware compatibile?
At the moment i have used a modified version of nodemcu sketch from your Arduino library and work very well.
ESP8266-EVB firmware?
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You can prepare dedicated firmware using SUPLA ESP8266 SDK.
https://www.supla.org/download/SUPLA-IOT-SDK_x86.ova
https://www.supla.org/download/SUPLA-IOT-SDK_x86.ova