阅读串口iOS

我有以下代码来读取和写入iOS 10.3.3越狱iPhone 6S上的串口(我使用h3lix进行越狱):

Serial.h:

//
//  Serial.h
//  iOUSB
//
//  Created by Brandon on 2018-05-21.
//  Copyright © 2018 XIO. All rights reserved.
//

#if !defined(__cplusplus)  //-fmodules -fcxx-modules
@import Foundation;
#else
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wauto-import"
#import 
#pragma clang diagnostic pop
#endif

#define BAUD_RATE 9600

@interface Serial : NSObject
+ (instancetype)shared;
- (bool)setup:(NSString *)filePath;
- (bool)disconnect;
- (size_t)available;
- (size_t)read:(uint8_t *)bytes length:(int32_t)length;
- (size_t)write:(uint8_t *)bytes length:(int32_t)length;
- (void)flushInputStream;
- (void)flushOutputStream;
- (void)flush;
- (NSString *)lastError;
- (void)eraseLastError;
@end

Serial.mm:

//
//  Serial.mm
//  iOUSB
//
//  Created by Brandon on 2018-05-21.
//  Copyright © 2018 XIO. All rights reserved.
//

#import "Serial.h"
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define DEFAULT_BAUD_RATE 9600

@interface Serial()
@property (nonatomic, assign) int file_descriptor;
@property (nonatomic, strong) NSString *lastError;
@end

@implementation Serial
+ (instancetype)shared {
    static Serial *instance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[Serial alloc] init];
    });
    return instance;
}

- (instancetype)init {
    if ((self = [super init])) {
        self.file_descriptor = -1;
        self.lastError = nil;
    }
    return self;
}

- (void)dealloc {
    [self disconnect];
}

- (bool)setup:(NSString *)filePath {
    if (self.file_descriptor != -1)
    {
        return true;
    }

    self.file_descriptor = open(filePath.UTF8String, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
    if (self.file_descriptor == -1)
    {
        const char* error = strerror(errno);
        self.lastError = [[NSString alloc] initWithUTF8String:error];
        perror(error);
        return false;
    }

    struct termios options;
    struct termios oldoptions;
    tcgetattr(self.file_descriptor, &oldoptions);
    optiOns= oldoptions;

    #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
    int baud_rates[] = {B0, B50, B75, B110, B134, B150, B200, B300, B1200, B1800, B2400, B4800, B9600, B19200, B38400, B7200, B14400, B28800, B57600, B76800, B115200, B230400
    };
    #else
    int baud_rates[] = {B0, B50, B75, B110, B134, B150, B200, B300, B1200, B1800, B2400, B4800, B9600, B19200, B38400};
    #endif

    auto it = std::find(std::begin(baud_rates), std::end(baud_rates), BAUD_RATE);
    if (it != std::end(baud_rates))
    {
        cfsetispeed(&options, *it);
        cfsetospeed(&options, *it);
        std::cout<<"BAUD_RATE Set Successfully!\n";
    }
    else
    {
        cfsetispeed(&options, DEFAULT_BAUD_RATE);
        cfsetospeed(&options, DEFAULT_BAUD_RATE);
        std::cerr<<"Invalid BAUD_RATE.. Setting to default: "<

我购买了OTG适配器:"Lightning to USB 3 Camera Adapter",如下所示:https://www.apple.com/ca/shop/product/MK0W2AM/A/lightning-to-usb-3-camera-adapter

我已插入设备并显示为不受支持的设备,这很好,因为它不是MFI认证的.

但是,当我试图打开时/dev/tty.iap,我一直在努力Error: Resource Busy.

我可以打开/dev/tty.wlan例子..只有一些端口给我带来麻烦iap.

我做错了什么,我看不懂tty.iap？我曾尝试将其移动到运行应用程序的根/Applications从/var/containers/Bundle/Applications..我试着chown root:wheel应用程序和chmod 0777应用程序.我还是得到resource busy..

我在网上看到,当你不是root用户时,你会收到这个错误.

如何以root身份运行我的应用程序？ 
我怎么能解决这个问题,这样才能看到闪电端口？

我试过/sf/ask/17360801/,但它似乎不起作用.无论我尝试多少次,应用程序都会启动然后立即关闭.