iOS蓝牙开发 - BLE(蓝牙4.0)

设备:

• 中心设备(CBCentralManager):iOS系统的手机等设备
• 外围设备(CBPeripheral):手环等第三方设备

外围设备:

• 服务: 外围设备下的子信息, 每个服务有一个UUID标示.
• 特征:服务下的子信息, 每个特征也有一个UUID标示.特征是外围设备的最小单位,每一个特征信息代表设备的一个信息或者数据, 以手环为例, 每一个特征可能代表手环记录的步数或者电量等信息.

实现步骤:

1. 创建中心设备(CBCentralManager)
2. 中心设备开始扫描(scanForPeripherals)
3. 扫描到外围设备之后, 自动调用中心设备的代理方法(didDiscoverPeripheral)
4. 如果设备过多, 可以将扫描到的外围设备添加到数组
5. 开始连接, 从数组中过滤出自己想要的设备, 进行连接(connectPeripheral)
6. 连接上之后, 自动调用中心设备的代理方法(didConnectPeripheral), 在代理中, 进行查找外围设备的服务(peripheral.discoverServices)
7. 查找到服务之后, 自动调用外围设备的代理(didDiscoverServices), 可通过UUID,查找具体的服务,查找服务(discoverCharacteristics)
8. 查找到特征之后, 自动调用外围设备的代理(didDiscoverCharacteristics), 通过UUID找到自己想要的特征, 读取特征(readValueForCharacteristic)
9. 读取到特征之后, 自动调用外设的代理方法(didUpdateValueForCharacteristic),在这里打印或者解析自己想要的特征值.

代码:

#import "ViewController.h"
#import 

//4个字节Bytes 转 int
unsigned int  TCcbytesValueToInt(Byte *bytesValue) {
    unsigned int  intV;
    intV = (unsigned int ) ( ((bytesValue[3] & 0xff)<<24)
                            |((bytesValue[2] & 0xff)<<16)
                            |((bytesValue[1] & 0xff)<<8)
                            |(bytesValue[0] & 0xff));
    return intV;
}

@interface ViewController () <CBCentralManagerDelegate, CBPeripheralDelegate>

// 扫描设备
- (IBAction)scanPeripheral:(id)sender;
// 连接蓝牙
- (IBAction)startConnect:(id)sender;
// 断开蓝牙
- (IBAction)disConnect:(id)sender;
// 开始震动
- (IBAction)startShake:(id)sender;
// 停止震动
- (IBAction)stopShake:(id)sender;
@property (weak, nonatomic) IBOutlet UILabel *label;

// 中心设备
@property (nonatomic, strong) CBCentralManager *manager;

// 外围设备集合
@property (nonatomic, strong) NSMutableArray *peripherals;

@end

@implementation ViewController

- (NSMutableArray *)peripherals{
    if (!_peripherals) {
        self.peripherals = [NSMutableArray array];
    }
    return _peripherals;
}

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

// 扫描设备
- (IBAction)scanPeripheral:(id)sender {
    NSLog(@"扫描设备...");
    // 扫描设备
    [self.manager scanForPeripheralsWithServices:nil options:nil];
}
// 开始连接
- (IBAction)startConnect:(id)sender {
    for (CBPeripheral *peripheral in self.peripherals) {

        NSLog(@"----->>>>>> peripheral == %@", peripheral);

        if ([peripheral.name isEqualToString:@"MI"]) {
            NSLog(@"这是公司的小米手环设备!");

            // 中心设备 连接 外围设备
            [self.manager connectPeripheral:peripheral options:nil];   
        }
    }
}
// 断开连接
- (IBAction)disConnect:(id)sender {

}
// 开始震动
- (IBAction)startShake:(id)sender {
}
// 停止震动
- (IBAction)stopShake:(id)sender {

}

#pragma mark -当前蓝牙主设备状态
- (void)centralManagerDidUpdateState:(CBCentralManager *)central{
    switch (central.state) {
        case CBCentralManagerStateUnknown:
            NSLog(@">>>CBCentralManagerStateUnknown");
            break;
        case CBCentralManagerStateResetting:
            NSLog(@">>>CBCentralManagerStateResetting");
            break;
        case CBCentralManagerStateUnsupported:
            NSLog(@">>>CBCentralManagerStateUnsupported");
            break;
        case CBCentralManagerStateUnauthorized:
            NSLog(@">>>CBCentralManagerStateUnauthorized");
            break;
        case CBCentralManagerStatePoweredOff:
            NSLog(@">>>CBCentralManagerStatePoweredOff");
            break;
        default:
            break;
    }
}

// 发现设备会进入方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI{

    // 添加外围设备
    if (![self.peripherals containsObject:peripheral]) {
        // 设置外设的代理
        peripheral.delegate = self;
        [self.peripherals addObject:peripheral];

        NSLog(@"扫描连接外设：%@ ",peripheral);

        self.label.text = [NSString stringWithFormat:@"%@", peripheral];
    }
}

/**
 *  连接到某个外设的时候调用
 */
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral{
    [central stopScan];

    NSLog(@"连接上了");

    // 查找外设中的所有服务
    [peripheral discoverServices:nil];
}

#pragma mark - CBPeripheralDelegate
/**
 *  外设已经查找到服务
 */
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
    // 遍历所有的服务
    for (CBService *service in peripheral.services) {

        NSLog(@"服务 = %@", service);

        // 过滤掉不想要的服务
        if ([service.UUID.UUIDString isEqual:@"FEE0"]) {
            // 找到想要的服务

            // 扫描服务下面的特征
            [peripheral discoverCharacteristics:nil forService:service];
        }
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error {
    // 遍历所有的特征
    for (CBCharacteristic *characteristic in service.characteristics) {
        NSLog(@"特征 = %@", characteristic);

        // 过滤掉不想要的特征
        if ([characteristic.UUID.UUIDString isEqual:@"FF0C"]) {
            // 找到想要的特征
            NSLog(@"电量: %@", characteristic);

            [peripheral readValueForCharacteristic:characteristic];
        }
    }
}

#pragma mark 设备信息处理
//扫描到具体的值
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error
{
    if (error) {
        NSLog(@"扫描外设的特征失败！%@-> %@",peripheral.name, [error localizedDescription]);
        self.title = @"find value error.";
        return;
    }
    NSLog(@"%@ %@",characteristic.UUID.UUIDString,characteristic.value);

    Byte *bufferBytes = (Byte *)characteristic.value.bytes;

    int buterys = TCcbytesValueToInt(bufferBytes)&0xff;

    NSLog(@"电池：%d%%",buterys);
}
@end