我尝试做一个tx（pc）-rx（arduino），tx（arduino）-rx（pc）连接，从客户端发送一个字符串“Hello World！：）”，用xamarin.forms格式，以便从串行端口接收用BLE解码的相同字符串。在我发送字符串的那一刻，它工作得很好，因为我在arduino的串行监视器上看到了完美的字符串，但当解码时，字符串与发送的字符串不一样。
代码：Arduino：

void loop(){
  if (BT.available() > 0 ){

    c = BT.readString();
    
    str_len = c.length() +1;
    char char_array[str_len];
    c.toCharArray(char_array, str_len);
    int i = 0;
    while(i<str_len){
      char_array_aux[i] = char_array[i];
      i++;
    }
    char_array_aux[str_len] = "\n";
    
   
      }
     
      int i = 0;
      while(i<str_len){
        if(char_array_aux[i] == "\n")
          BT.end();
        BT.print(char_array_aux[i]);
        i++;

      }
      
      
    
  }

Xamarin.Forms应用程序发送/接收消息功能：

public async Task sendAndReceiveString()
        {
            //Guid characteristics =    Id  {0000ffe1-0000-1000-8000-00805f9b34fb}  System.Guid
            //Guid services =   Id  {0000ffe0-0000-1000-8000-00805f9b34fb}  System.Guid

            var stringToSend = "Hello World! :)";
            var services = await deviceConn.GetServicesAsync();
            IService service = services[0];
            var characteristics = await service.GetCharacteristicsAsync();
            var characteristic = characteristics[0];
            try
            {

                //Write message
                byte[] bytes = Encoding.ASCII.GetBytes(stringToSend);
                
                await characteristic.WriteAsync(bytes);

                //Read Message
                

                byte[] answ = await characteristic.ReadAsync();
                string answ_str = Encoding.ASCII.GetString(answ);
                

                msgSended = "Message sended:" + stringToSend;
              
               
                        msgReceived = "Message received: " + answ_str;
            }

调试日志：

Sended string: Hello world! :) 

Received string: Hello world! :)
Hello world! :)
He

我不知道如何使用蓝牙缓冲区正常工作。如果有人知道，请让我知道。
先谢谢你了。
你好，劳尔。