使用BLE从iPhone向arduino发送数据时出现问题

Question

我已经尝试过多次将数据从iPhone发送到hm-10模块，但是我无法弄清楚我的快速代码是否错误，或者是我的arduino代码不正确，这是我的快速代码，因为我认为这是有问题的代码：

func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
       guard let characteristics = service.characteristics else { return }

       for characteristic in characteristics {
           if characteristic.properties.contains(.write) || characteristic.properties.contains(.writeWithoutResponse) {
               mainCharacteristic = characteristic
               mainCentralManager.stopScan()
               updateUI()


               guard let peripheral = mainPeripheral, let characteristic = mainCharacteristic else { print("problem")
                   return }

               var data1 = 5
               var data2 = 7
                   var data = Data(buffer: UnsafeBufferPointer(start: &data1, count: 1))
                   data.append(Data(buffer: UnsafeBufferPointer(start: &data2, count: 1)))
                   peripheral.writeValue(data, for: characteristic, type: .withoutResponse)
               print("data sent")
               break

           }
       }
}

这是我的arduino代码，以防万一：

#include <SoftwareSerial.h>

SoftwareSerial mySerial(8,9);

void setup()
{
  mySerial.begin(9600);   
  Serial.begin(9600);   
  delay(100);
}

void loop()
{
  if (mySerial.available()>0){
    Serial.print(mySerial.read());
    Serial.print("\n");
  }
}

谢谢