please help me!!

#include <SoftwareSerial.h>
#include <Wire.h>//引用二個函式庫SoftwareSerial及Wire

SoftwareSerial I2CBT(10,11);//定義PIN10及PIN11分別為RX及TX腳位

void setup() {
  Serial.begin(9600); //Arduino起始鮑率:9600
  I2CBT.begin(57600); 
//藍牙鮑率:57600(注意!每個藍牙晶片的鮑率都不太一樣,請務必確認
  pinMode(13, OUTPUT);  //設定 pin13 為輸出,LED就接在這
}

void loop() {
byte cmmd[20];
int insize; 
while(1){
  if ((insize=(I2CBT.available()))>0){  //讀取藍牙訊息
     Serial.print("input size = ");
     Serial.println(insize);
     for (int i=0; i<insize; i++){
Serial.print(cmmd[i]=char(I2CBT.read()));
Serial.print(" ");
     }//此段請參考上一篇解釋
  }
  switch (cmmd[0]) { //讀取第一個字
     case 97: //97為"a"的ASCII CODE
        digitalWrite(13,HIGH);  //點亮LED
        break;

     case 98://98為"b"的ASCII CODE
        Serial.println("Get b");
        digitalWrite(13,LOW);   //熄滅LED
        break;
  } //Switch
  } //while
}//loop

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