Connection problem: Arduino YUN + BT shield 2.2 (Itead)

Projects Networking, Protocols, and Devices
1

Hi, well Im having problems, trying to connect a BT shield 2.2 (http://imall.iteadstudio.com/im120417010.html).

The connection is between the itead shield and Arduino YUN, Im trying to configure through Coolterm, but dont respond.
I tried with Arduino UNO and works very well, but I use YUN, didnt work.
This is my code:

#include <SoftwareSerial.h>
SoftwareSerial BT(1, 0); 
// creates a "virtual" serial port/UART
// connect BT module TX to D0
// connect BT module RX to D1
// connect BT Vcc to 5V, GND to GND
void setup()  
{
  // set digital pin to control as an output
  pinMode(13, OUTPUT);
  // set the data rate for the SoftwareSerial port
  BT.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
}
String a; // stores incoming character from other device
void loop() 
{
  if (BT.available())
  // if text arrived in from BT serial...
  {
    a=BT.readString();
    if (a.equals("ON"))
    {
      digitalWrite(13, HIGH);
      BT.write("LED on from Arduino~");
    }
    if (a.equals("OFF"))
    {
      digitalWrite(13, LOW);
      BT.write("LED off from Arduino~");
    }   
    // you can add more "if" statements with other characters to add more commands
  }
}

Im tried to change Serial to Serial1, but its the same... dont works.
Maybe I forgot a configuration in Arduino YUN... or my code is not the best.