2 个 iOS 设备之间的蓝牙连接 [英] Bluetooth connection between 2 iOS devices

问题描述

我正在尝试核心蓝牙框架 在 iOS 5.0 中引入.根据 StackOverflow 本身的许多线程(其中之一):

1. 核心蓝牙框架可用于与ANY通信硬件，具有低功耗蓝牙 (4.0) 硬件支持.
2. 我们可以忘记 Made For iPhone/iPod (MFI) 计划，如果您是使用核心蓝牙技术.

我有一部 iPhone 5、iPhone 4S、Google Android Nexus 7，我确信至少前 2 部有对 BLE 的硬件支持.

我的问题是

好吧，我在我的 iPhone 4S/iPhone 5 上尝试了下面给出的代码，但它无法扫描并找到附近的 iPhone5/iPhone 4S.我可以确认，两个设备都打开了蓝牙.委托方法 didDiscoverPeripheral 永远不会被调用.原因可能是什么?我错过了什么吗?

这是我的代码(精简为一个小型测试项目).

视图控制器.h

@interface ViewController:UIViewController

ViewController.m

@implementation ViewController@synthesize mCentralManager;- (void)viewDidLoad{[超级viewDidLoad];mCentralManager = [[CBCentralManager alloc]initWithDelegate:self queue:nil];[self scanForPeripherals];}- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral adsData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {NSLog(@"收到外设:%@",外设);}- (int) scanForPeripherals {if (self.mCentralManager.state != CBCentralManagerStatePoweredOn){NSLog(@"self.mCentralManagerState : %d",self.mCentralManager.state);返回-1；}//到这里好了..蓝牙已开启.NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:NO], CBCentralManagerScanOptionAllowDuplicatesKey, nil];//文档说 passind nil 作为设备 UUID，扫描并找到每个外围设备[self.mCentralManager scanForPeripheralsWithServices:nil options:options];返回0；}@结尾

解决方案

正如 spamsink 所说，一台设备需要充当外围设备，另一台设备需要充当中心以便它们进行通信.

有一个很棒的示例应用 就是这样做的.此外，请查看 WWDC 2012 会议 703 - CoreBluetooth 101 和 705 -Advanced CoreBluetooth 对 CoreBluetooth 框架使用的精彩解释和示例.>

另外请注意，要使设备处于外围模式，需要更新到 iOS 6.0 或更高版本.

I am trying out Core Bluetooth framework introduced in iOS 5.0. According to many threads (one of many) on StackOverflow itself:

1. Core Bluetooth framework can be used to communicate with ANY hardware, which has Bluetooth Low Energy (4.0) hardware support.
2. We can forget about Made For iPhone/iPod (MFI) program, if you are using Core Bluetooth technology.

I have an iPhone 5, iPhone 4S, Google Android Nexus 7 with me, and I am sure at least first 2 has hardware support for BLE.

My Question is

Well, I tried below given code on my iPhone 4S/iPhone 5, but it failed to scan and find the iPhone5/iPhone 4S sitting near by. I can confirm, both devices had bluetooth turned ON. The delegate method didDiscoverPeripheral never getting called. What might be the reasons? Am I missing something?

This is my code (stripped down to a small test project).

ViewController.h

@interface ViewController:UIViewController<CBCentralManagerDelegate, CBPeripheralDelegate{
}
@property (strong, nonatomic) CBCentralManager *mCentralManager;
@end

ViewController.m

@implementation ViewController
@synthesize mCentralManager;

- (void)viewDidLoad{
    [super viewDidLoad];
    mCentralManager = [[CBCentralManager alloc]initWithDelegate:self queue:nil];
    [self scanForPeripherals];
}

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {
    NSLog(@"Received periferal :%@",peripheral);
}

- (int) scanForPeripherals {
    if (self.mCentralManager.state != CBCentralManagerStatePoweredOn)
    {
        NSLog(@"self.mCentralManagerState : %d",self.mCentralManager.state);
        return -1;
    }
    //Getting here alright.. bluetooth is powered on.
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:NO], CBCentralManagerScanOptionAllowDuplicatesKey, nil];
    //Documentation says passind nil as device UUID, scans and finds every peripherals
    [self.mCentralManager scanForPeripheralsWithServices:nil options:options];
    return 0;
}
@end

解决方案

As spamsink commented, one device needs to act as peripheral, and one as central in order for them to communicate.

There is a great sample app from Apple that does that. Also, check out WWDC 2012 sessions 703 - CoreBluetooth 101 and 705 - Advanced CoreBluetooth for great explanation and examples of CoreBluetooth framework usage.

Also note, for device to be in peripheral mode, it needs to be updated to iOS 6.0 or later.

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