Arduino Software "Reset" (restart of sketch)

reset.ino

void softwareReset(unsigned long delayMillis) {
  uint32_t resetTime = millis() + delayMillis;
  while (resetTime > millis()) {
    /* wait and do nothing until the required delay expires... */
  }
  // jump to the start of the program
  asm volatile("jmp 0");
}

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}