An ESP32 or RESP8266 (the code will compile accordingly for your chosen platform) acts as a Web Server that displays the results of sensor (Clients) that upload data. The Client code for the example sensors will compile according to your board choice of ESP32 or ESP8266.
You can test the server without any clients by typing the examples provided in the video or on Github.
Code: https://github.com/G6EJD/ESP-Sensor-S...