Here it is described in Slovenian language, but Google Translate will translate in your langue.
https://www.elektronik.si/phpBB2/viewtopic.php?t=53095
because of forum rules you cannot open attachments. If you need some just let me know.
One of the things you don’t seem to mention is that your code first requires the user to open the Edgent ESP8266 example then replace the .ino file with the code you posted. The posted code on its own won’t work.
Pete.
Perhaps translation is not so good as expected.
I don’t mean to replace file, but only “main” page with code that I put on.