String comdata="";
void setup() {
// put your setup code here, to run once:
pinMode(13, OUTPUT);
Serial.begin(9600);
while(Serial.read() >= 0){}
Serial.println(“Begin”);
}

void loop() {
// put your main code here, to run repeatedly:
ReceiveWifiMessage();
if(comdata.length()>0){
Serial.println(comdata);
if(comdata.compareTo(“open”)>0){
Serial.println(“Light”);
digitalWrite(13, HIGH); // 将LED点亮（HIGH代表高电压）
}else{
Serial.println(“Dark”);
digitalWrite(13, LOW); // 将LED熄灭（LOW代表低压）
}
}
}

/**

• 读取串口缓冲区里面的数据
  */
  void ReceiveWifiMessage(){
  comdata="";
  while (Serial.available() > 0 )
  {
  comdata+=char(Serial.read());
  delay(2);
  }
  }