I am working through Daniel Eichorn's Weather Station Kindle book. In Daniel's latest version of WeatherStationDemo dated 2018 there is a required library called coredecls.h that the compiler can't find (using Arduino IDE 1.8.8). I can't figure out where to get that particular library.
These are the library versions I have installed, all the latest versions per the Library Manager:
ESP8266 OLED driver 4.0.0
ESP8266 Weather Station 1.6.5
JSON Streaming Parser 1.0.5
Are there any other libraries I need to install? Is there a later version that I need to install?
Thank you all so much!!!