Lil help about null \0

[gaouser]

I need help about \0 and readstringuntil, I cant make it work even if i make a custom readstringuntil

String readStringFast(char delimiter) {
  String line = "";
  while (true) {
    char c = SerialBT.read();
    if (c == delimiter) {
      line += delimiter;
      break;
    } else {
      line += c;
    }
  }
  return line;
}

[UKHeliBob]

How are you entering the '\0' ?

[gcjr]

look this over

String
readStringFast (char delimiter)
{
  String line = "";
  while (true) {
    if (Serial.available ())  {
        char c = Serial.read();
        line += c;
        if (c == delimiter)
            return line;
    }
  }
}

// -----------------------------------------------------------------------------
void loop (void)
{
    if (Serial.available ()) {
#if 1
        Serial.print (readStringFast ('\n'));
#else
        char buf [80];
        int  n = Serial.readBytesUntil ('\n', buf, sizeof(buf)-2);
        buf [n]   = '\n';
        buf [n+1] = '\0';

        Serial.print (buf);
#endif
    }
}

void setup (void)
{
    Serial.begin (9600);
}