Comment déterminer combien de pourcents de mémoire (heap) sont libres sur ESP32 ?

#include <esp_heap_caps.h>

uint32_t freeHeapBytes = heap_caps_get_free_size(MALLOC_CAP_DEFAULT);
uint32_t totalHeapBytes = heap_caps_get_total_size(MALLOC_CAP_DEFAULT);
float percentageHeapFree = freeHeapBytes * 100.0f / (float)totalHeapBytes;

// Affiche sur le port série
Serial.printf("[Memory] %.1f%% free - %d of %d bytes free\n", percentageHeapFree, freeHeapBytes, totalHeapBytes);