Smartwatch - Arduino LED Control

# include <SoftwareSerial.h>
SoftwareSerial bt_serial(2, 3);
String peticion = "";
char c = ' ';

void setup() {
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);
  digitalWrite(8, LOW);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
  digitalWrite(11, LOW);
  bt_serial.begin(38400);
  bt_serial.setTimeout(5);
  Serial.begin(9600);
}

void loop() {
  if (bt_serial.available() > 0) {
    while (bt_serial.available() > 0) {
      c = bt_serial.read();
      peticion += c;
    }
    Serial.println(peticion);
    if (peticion == "act1on") {
      digitalWrite(4, HIGH);
      Serial.println("Uno on");
    }
    if (peticion == "act1off") digitalWrite(4, LOW);
    if (peticion == "act2on") digitalWrite(5, HIGH);
    if (peticion == "act2off") digitalWrite(5, LOW);
    if (peticion == "act3on") digitalWrite(6, HIGH);
    if (peticion == "act3off") digitalWrite(6, LOW);
    if (peticion == "act4on") digitalWrite(7, HIGH);
    if (peticion == "act4off") digitalWrite(7, LOW);
    if (peticion == "act5on") digitalWrite(8, HIGH);
    if (peticion == "act5off") digitalWrite(8, LOW);
    if (peticion == "act6on") digitalWrite(9, HIGH);
    if (peticion == "act6off") digitalWrite(9, LOW);
    if (peticion == "act7on") digitalWrite(10, HIGH);
    if (peticion == "act7off") digitalWrite(10, LOW);
    if (peticion == "act8on") digitalWrite(11, HIGH);
    if (peticion == "act8off") digitalWrite(11, LOW);
  }
    peticion = "";
    c = ' ';
}