ESP8266 ESP-01 with AT version:0.50.0.0

@Kolban There we go... I fully support your idea that time has moved on... not just a little bit, because:

Solving the interface problems to allow any computer using a standard serial port to control the modem functions with software, they invented the Hayes Standard AT command set, introducing the first PC modem in June 1981. some computer history article.

Nothing wrong with AT commands, but it is much easier to communicate with JSON... (even XML is somewhat outdated, who would have thought that...).