

byte cmdlen = 0;

void setup() {                
  DDRC = B11111111; 
  DDRB = B11111111;
  DDRD = B11111110;
  Serial.begin(9600);
  PORTC = B00000000;
  PORTB = B00000000;
  PORTD = B00000000;
}

void loop() {
  ServeConsole();
}

void ServeConsole() {
  static char cmd[16];
  while(Serial.available()) {                     // Read chars from buffer.
    byte c = Serial.read();
    if (cmdlen>=sizeof(cmd)) {
      Serial.println("Troll detected!");
      c = '-';
    }
    Serial.print((char)c);
    if (c == 10 || c == 13 || c==64) {
      for (cmdlen=cmdlen; cmdlen