ESP Timer's `CONFIG_ESP_TIMER_SUPPORTS_ISR_DISPATCH_METHOD` requires user callbacks to be placed in IRAM (IDFGH-8821) · Issue #10250 · espressif/esp-idf · GitHub
ESP32 Timers with ESP-IDF
ESP32/ESP8266 Web Server: Control Outputs with Timer | Random Nerd Tutorials
Understanding the ESP timer's program selector switch – iScaper Blog