I am trying to transfer data by using program "Typical Write Example" running on ESP8266 NodeMCU. I didn't change he program , only added my Network name, network password, channel number and APIWriteKey. The Program is running on ESP8266 or ESP32. In both cases the response is always "400".
Don't have more detailed information.
Any idea on the cause ? Router problem , Arduino IDE 1.8.10 or ?
Any comment is appreciated.