private String readInputStream(BufferedReader _in)
    throws IOException {
    	char[] buff = new char[tele_length*2];
    	int read = _in.read(buff, 0, tele_length*2);
    	String data = "";
    	
    	if(read != -1){
	    	for(int i =0; i< buff.length; i++)
	    	{
	    		data = data + buff[i];
	    	}
    	}
    	else{
    		return null;
    	}
    	
    	System.out.println("data: "+data);
    	
    	if(read > tele_length){
    		data = data.substring(0, tele_length);
    	}
    	
    	//System.out.println("data: "+data);
        System.out.println("Len got : "+read);
        return data;
    }