if (fileUtils.listFile("UPDATE.OK") == 1) {

auto size = fileUtils.listFile(filename);

auto cycles = (size / blockSize) + 1;

if (size > SSU_SIZE) {

size -= SSU_SIZE;

/* Erase the MCU flash */

uint32_t flash_address = (uint32_t)SKETCH_START;

mcu_flash.erase((void*)flash_address, size);

for (auto i = 0; i < cycles; i++) {

uint8_t block[blockSize] { 0 };

digitalWrite(LED_BUILTIN,LOW);

auto read = fileUtils.readBlock(filename, (i * blockSize) + SSU_SIZE, blockSize, block);

digitalWrite(LED_BUILTIN,HIGH);

mcu_flash.write((void*)flash_address, block, read);

flash_address += read;

}

update_success = true;

}

if (update_success) {

fileUtils.deleteFile(filename);

fileUtils.deleteFile("UPDATE.OK");