 // Unused
 #define LED3_PIN 7
 
+// Currently used for vibration on EXIT knock
+#define BUZZER_PIN 8
+
 #define HANDSHAKE_STR "handshake"
 #define KNOCK_STR "knock"
 

  pinMode(LED1_PIN, OUTPUT);
  pinMode(LED2_PIN, OUTPUT);
  pinMode(LED3_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
 
  digitalWrite(LED1_PIN, 0);
  digitalWrite(LED2_PIN, 0);
  digitalWrite(LED3_PIN, 0);

  global_debug = debug;
  global_userid = -1;

    global_state |= STATE_KNOCK;
    digitalWrite(LED2_PIN, 1);
  }
  else {
    if (global_debug) {
      Serial.print("DEBUG Unknown action ");
      Serial.println(gamearg);
    }
    return;
  }

  char *userarg = sCmd.next();
  if (userarg) {
