Problems with compiling more then one sketch in the Arduino IDE I found this ESP8266-MQTT program on Github.
How can I compile this thing with the Arduino IDE?
I only can open one sketch at a time. If I try to compile this then parts of the program are missing for AVRDUDE - but they are in the same folder.
Please can you help me?
That sketch is written for the ESP8266, not the ESP32. The two are very different chips, and the libraries used are very different.
You will have to learn how the sketch works, and how the ESP32 libraries work, and port the sketch to the ESP32 once you have learned how.