Hello, in the book Build web servers ESP 32 and ESP 8266 section, 2.5 – WebSocket Web Server: Control Multiple Outputs, when built the program ESP32. I got that fault (collect2.exe: error: ld returned 1 exit status
*** [.pio\build\esp32doit-devkit-v1\firmware.elf] Error 1). It does not happen with ESP8266.