Need to make my program send random OTPs to my phone number

Projects Programming
12

Aakarsh:
xD
I'll change it to "OTP".
I don't want the same password. Like a one time password. It needs to change everytime

char OTP[5] = "test";

void setup() 
{
  Serial.begin(115200);
  randomSeed(analogRead(A0));
  updateOTP();
  Serial.println(OTP);
}

void loop() 
{

}

void updateOTP()
{
  char newString [5];
  for (int i = 0; i < sizeof(newString); i++)
  {
    if (i == sizeof(newString) - 1)
    {
      newString[i] = '\0';
    }
    else
    {
      newString[i] = random('0',':');
    }
  }
  strcpy(OTP, newString);
}