相關(guān)基礎(chǔ)知識(shí)介紹

藍(lán)牙常見(jiàn)名稱和縮寫(xiě)

• BLE:(Bluetooth low energy)藍(lán)牙4.0設(shè)備因?yàn)榈秃碾?也叫BLE
• peripheral,central:外設(shè)和中心設(shè)備,發(fā)起鏈接的是central(一般是指手機(jī)),被鏈接的設(shè)備是peripheral(運(yùn)動(dòng)手環(huán))
• service and characteristic:(服務(wù)和特征)每個(gè)設(shè)備會(huì)提供服務(wù)和特征,類似于服務(wù)端的API,但是結(jié)構(gòu)不同.每個(gè)設(shè)備會(huì)有很多服務(wù),每個(gè)服務(wù)中包含很多字段,這些字段的權(quán)限一般分為讀(read),寫(xiě)(write),通知(notify)幾種,就是我們連接設(shè)備后具體需要操作的內(nèi)容
• Description:每個(gè)characteristic可以對(duì)應(yīng)一個(gè)或者多個(gè)Description用于描述characteristic的信息或?qū)傩?eg.范圍,計(jì)量單位)

藍(lán)牙基礎(chǔ)知識(shí)

• CoreBluetooth框架的核心其實(shí)是倆東西:peripheral和central,對(duì)應(yīng)他們分別有一組相關(guān)的API和類

  
  

• 這兩組api分別對(duì)應(yīng)不同的業(yè)務(wù)常見(jiàn):左側(cè)叫中心模式,就是以你的app作為中心,連接其他的外設(shè)的場(chǎng)景;而右側(cè)稱為外設(shè)模式,使用手機(jī)作為外設(shè)連接其他中心設(shè)備操作的場(chǎng)景

• 服務(wù)和特征(service and characteristic)

  • 每個(gè)設(shè)備都會(huì)有1個(gè)or多個(gè)服務(wù)
  • 每個(gè)服務(wù)里都會(huì)有1個(gè)or多個(gè)特征
  • 特征就是具體鍵值對(duì),提供數(shù)據(jù)的地方
  • 每個(gè)特征屬性分為:讀,寫(xiě),通知等等

typedef NS_OPTIONS(NSUInteger, CBCharacteristicProperties) {
    CBCharacteristicPropertyBroadcast                                               = 0x01,
    CBCharacteristicPropertyRead                                                    = 0x02,
    CBCharacteristicPropertyWriteWithoutResponse                                    = 0x04,
    CBCharacteristicPropertyWrite                                                   = 0x08,
    CBCharacteristicPropertyNotify                                                  = 0x10,
    CBCharacteristicPropertyIndicate                                                = 0x20,
    CBCharacteristicPropertyAuthenticatedSignedWrites                               = 0x40,
    CBCharacteristicPropertyExtendedProperties                                      = 0x80,
    CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)     = 0x100,
    CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)   = 0x200
};

• 外設(shè),服務(wù),特征的關(guān)系

  
  

BLE中心模式流程

• 1.建立中心角色
• 2.掃描外設(shè)(Discover Peripheral)
• 3.連接外設(shè)(Connect Peripheral)
• 4.掃描外設(shè)中的服務(wù)和特征(Discover Services And Characteristics)
  • 4.1 獲取外設(shè)的services
  • 4.2 獲取外設(shè)的Characteristics,獲取characteristics的值,,獲取Characteristics的Descriptor和Descriptor的值
• 5.利用特征與外設(shè)做數(shù)據(jù)交互(Explore And Interact)
• 6.訂閱Characteristic的通知
• 7.斷開(kāi)連接(Disconnect)

BLE外設(shè)模式流程

• 1.啟動(dòng)一個(gè)Peripheral管理對(duì)象
• 2.本地peripheral設(shè)置服務(wù),特征,描述,權(quán)限等等
• 3.peripheral發(fā)送廣告
• 4.設(shè)置處理訂閱,取消訂閱,讀characteristic,寫(xiě)characteristic的代理方法

藍(lán)牙設(shè)備的狀態(tài)

• 1.待機(jī)狀態(tài)(standby):設(shè)備沒(méi)有傳輸和發(fā)送數(shù)據(jù),并且沒(méi)有連接到任何外設(shè)
• 2.廣播狀態(tài)(Advertiser):周期性廣播狀態(tài)
• 3.掃描狀態(tài)(Scanner):主動(dòng)搜索正在廣播的設(shè)備
• 4.發(fā)起鏈接狀態(tài)(Initiator):主動(dòng)向掃描設(shè)備發(fā)起連接
• 5.主設(shè)備(Master):作為主設(shè)備連接到其它設(shè)備.
• 6.從設(shè)備(Slave):作為從設(shè)備鏈接到其它設(shè)備

藍(lán)牙設(shè)備的五種工作狀態(tài)

• 準(zhǔn)備(Standby)
• 廣播(Advertising)
• 監(jiān)聽(tīng)掃描(Scanning)
• 發(fā)起連接(Initiating)
• 已連接(Connected)

BLE中心模式流程-coding

BLE中心模式流程

• 1.建立中心角色
• 2.掃描外設(shè)(Discover Peripheral)
• 3.連接外設(shè)(Connect Peripheral)
• 4.掃描外設(shè)中的服務(wù)和特征(Discover Services And Characteristics)
  • 4.1 獲取外設(shè)的services
  • 4.2 獲取外設(shè)的Characteristics,獲取characteristics的值,,獲取Characteristics的Descriptor和Descriptor的值
• 5.利用特征與外設(shè)做數(shù)據(jù)交互(Explore And Interact)
• 6.訂閱Characteristic的通知
• 7.斷開(kāi)連接(Disconnect)

準(zhǔn)備環(huán)境

• 1.Xcode
• 2.手機(jī)
• 3.外設(shè)(手機(jī)+LightBlue)

實(shí)現(xiàn)步驟

1.導(dǎo)入CB頭文件,建立主設(shè)備管理類,設(shè)置主設(shè)備代理

#import <CoreBluetooth/CoreBluetooth.h>
@interface XMGBLEController () <CBCentralManagerDelegate>
@property (nonatomic, strong) CBCentralManager *cMgr; /**< 中心管理設(shè)備 */
@end
@implementation XMGBLEController
#pragma mark - 懶加載
// 1.建立中心管理者
- (CBCentralManager *)cMgr
{
    if (!_cMgr) {
        NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
        /*
         設(shè)置主設(shè)備的代理,CBCentralManagerDelegate
         必須實(shí)現(xiàn)的：
         - (void)centralManagerDidUpdateState:(CBCentralManager *)central;//主設(shè)備狀態(tài)改變調(diào)用，在初始化CBCentralManager的適合會(huì)打開(kāi)設(shè)備，只有當(dāng)設(shè)備正確打開(kāi)后才能使用
         其他選擇實(shí)現(xiàn)的委托中比較重要的：
         - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI; //找到外設(shè)
         - (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral;//連接外設(shè)成功
         - (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//外設(shè)連接失敗
         - (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//斷開(kāi)外設(shè)
         */
        _cMgr = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()]; // 線程不傳默認(rèn)是主線程
    }
    return _cMgr;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"BLE";
    self.view.backgroundColor = [UIColor orangeColor];
    // 初始化
    [self cMgr];
    // 不能在此處掃描,因?yàn)闋顟B(tài)還沒(méi)變?yōu)榇蜷_(kāi)
    //[self.cMgr scanForPeripheralsWithServices:nil options:nil];
}

2.掃描外設(shè)

• 掃描的方法防治cMgr成功打開(kāi)的代理方法中
• 只有設(shè)備成功打開(kāi),才能開(kāi)始掃描,否則會(huì)報(bào)錯(cuò)

#pragma mark - CBCentralManagerDelegate
// 中心管理者狀態(tài)改變, 在初始化CBCentralManager的時(shí)候會(huì)打開(kāi)設(shè)備，只有當(dāng)設(shè)備正確打開(kāi)后才能使用
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    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;
        case CBCentralManagerStatePoweredOn:
            NSLog(@">>>CBCentralManagerStatePoweredOn");
            // 2.開(kāi)始掃描周圍的外設(shè)
            /*
             第一個(gè)參數(shù)nil就是掃描周圍所有的外設(shè)，掃描到外設(shè)后會(huì)進(jìn)入
             - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI;
             */
            [self.cMgr scanForPeripheralsWithServices:nil options:nil];

            break;
        default:
        break;
    }
}
// 掃描到設(shè)備會(huì)進(jìn)入到此代理方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSLog(@"%s, line = %d, per = %@, data = %@, rssi = %@", __FUNCTION__, __LINE__, peripheral, advertisementData, RSSI);
    // 接下來(lái)連接設(shè)備
}

3.連接外設(shè)

• 掃描手環(huán),打印結(jié)果

  
  
• 根據(jù)打印結(jié)果

// 掃描到設(shè)備會(huì)進(jìn)入到此代理方法
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSLog(@"%s, line = %d, per = %@, data = %@, rssi = %@", __FUNCTION__, __LINE__, peripheral, advertisementData, RSSI);

    // 3.接下來(lái)可以連接設(shè)備
    //如果你沒(méi)有設(shè)備，可以下載一個(gè)app叫l(wèi)ightbule的app去模擬一個(gè)設(shè)備
    //這里自己去設(shè)置下連接規(guī)則，我設(shè)置的是二維碼掃描到的運(yùn)動(dòng)手環(huán)的設(shè)備號(hào)
    // 判斷設(shè)備號(hào)是否掃描到
    if ([peripheral.name isEqualToString:@"OBand-75"]) {
        /*
         一個(gè)主設(shè)備最多能連7個(gè)外設(shè)，每個(gè)外設(shè)最多只能給一個(gè)主設(shè)備連接,連接成功，失敗，斷開(kāi)會(huì)進(jìn)入各自的委托
         - (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral;//連接外設(shè)成功的委托
         - (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//外設(shè)連接失敗的委托
         - (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;//斷開(kāi)外設(shè)的委托
         */
        // 保存外設(shè),否則方法結(jié)束就銷毀
        self.per = peripheral;
        [self.cMgr connectPeripheral:self.per options:nil];
    }else
    {
        // 此處Alert提示未掃描到設(shè)備,重新掃描
#warning noCode
        NSLog(@"沒(méi)掃描到 >>>>>>>>  %s, line = %d", __FUNCTION__, __LINE__);
    }
}
// 外設(shè)連接成功
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    NSLog(@">>>連接到名稱為（%@）的設(shè)備-成功",peripheral.name);
}
// 外設(shè)連接失敗
- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 斷開(kāi)連接(丟失連接)
- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}

4.掃描外設(shè)中的服務(wù)和特征

  設(shè)備鏈接成功后,就可以掃描設(shè)備的服務(wù)(services)了,同樣是通過(guò)代理,掃描到結(jié)果后會(huì)觸發(fā)某代理方法.
  注意:此時(shí)CBCentralManagerDelegate已經(jīng)不能滿足需求,需要新的CBPeripheralDelegate來(lái)搞定.
  該協(xié)議中包含了central與peripheral的許多回調(diào)方法
  (eg.:獲取services,獲取characteristics,獲取characteristics的值,獲取characteristics的Descriptor以及Descriptor的值,寫(xiě)數(shù)據(jù),讀RSSI,用通知的方式訂閱數(shù)據(jù)等等).

• 4.1 獲取外設(shè)的services
  • 首先設(shè)置外設(shè)的代理,并搜尋services
  • 然后在代理方法peripheral:didDiscoverServices:中遍歷services

// 外設(shè)連接成功
- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    NSLog(@">>>連接到名稱為（%@）的設(shè)備-成功",peripheral.name);
    //設(shè)置的peripheral代理CBPeripheralDelegate
    //@interface ViewController : UIViewController<CBCentralManagerDelegate,CBPeripheralDelegate>
    [peripheral setDelegate:self];

    //掃描外設(shè)Services，成功后會(huì)進(jìn)入方法：-(void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error{
    [peripheral discoverServices:nil];
    /*
     Discovers the specified services of the peripheral.
     An array of CBUUID objects that you are interested in. Here, each CBUUID object represents a UUID that identifies the type of service you want to discover.
     */
}

#pragma mark - CBPeripheralDelegate
// 發(fā)現(xiàn)外設(shè)的service
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
    if (error)
    {
        NSLog(@">>>Discovered services for %@ with error: %@", peripheral.name, [error localizedDescription]);
        return;
    }

    for (CBService *service in peripheral.services) {
        NSLog(@"service.UUID = %@", service.UUID);
        //掃描每個(gè)service的Characteristics，掃描到后會(huì)進(jìn)入方法： -(void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
        [peripheral discoverCharacteristics:nil forService:service];
    }
}

• 4.2 獲取外設(shè)的characteris,獲取Characteristics的值,獲取Characteristics的Descriptor以及Descriptor的值

// 外設(shè)發(fā)現(xiàn)service的特征
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    if (error)
    {
        NSLog(@"error Discovered characteristics for %@ with error: %@", service.UUID, [error localizedDescription]);
        return;
    }
    for (CBCharacteristic *characteristic in service.characteristics)
    {
        NSLog(@"service:%@ 的 Characteristic: %@",service.UUID,characteristic.UUID);
    }

#warning noCodeFor 優(yōu)化,分開(kāi)寫(xiě)是為了讓大家看注釋清晰,并不符合編碼規(guī)范
    //獲取Characteristic的值，讀到數(shù)據(jù)會(huì)進(jìn)入方法：-(void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
    for (CBCharacteristic *characteristic in service.characteristics){
        [peripheral readValueForCharacteristic:characteristic]; // 外設(shè)讀取特征的值
    }

    //搜索Characteristic的Descriptors，讀到數(shù)據(jù)會(huì)進(jìn)入方法：-(void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
    for (CBCharacteristic *characteristic in service.characteristics){
        [peripheral discoverDescriptorsForCharacteristic:characteristic]; // 外設(shè)發(fā)現(xiàn)特征的描述
    }
}

// 獲取characteristic的值
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(nonnull CBCharacteristic *)characteristic error:(nullable NSError *)error
{
    //打印出characteristic的UUID和值
    //!注意，value的類型是NSData，具體開(kāi)發(fā)時(shí)，會(huì)根據(jù)外設(shè)協(xié)議制定的方式去解析數(shù)據(jù)
    NSLog(@"%s, line = %d, characteristic.UUID:%@  value:%@", __FUNCTION__, __LINE__, characteristic.UUID, characteristic.value);
}
// 獲取Characteristics的 descriptor的值
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForDescriptor:(nonnull CBDescriptor *)descriptor error:(nullable NSError *)error
{
    //打印出DescriptorsUUID 和value
    //這個(gè)descriptor都是對(duì)于characteristic的描述，一般都是字符串，所以這里我們轉(zhuǎn)換成字符串去解析
    NSLog(@"%s, line = %d, descriptor.UUID:%@ value:%@", __FUNCTION__, __LINE__, descriptor.UUID, descriptor.value);
}
// 發(fā)現(xiàn)特征Characteristics的描述Descriptor
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(nonnull CBCharacteristic *)characteristic error:(nullable NSError *)error
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    for (CBDescriptor *descriptor in characteristic.descriptors) {
        NSLog(@"descriptor.UUID:%@",descriptor.UUID);
    }
}

5.寫(xiě)數(shù)據(jù)到特征中

// 5.將數(shù)據(jù)寫(xiě)入特征(自定義方法,為了看的更清楚,沒(méi)別的意思)
- (void)yf_peripheral:(CBPeripheral *)peripheral writeData:(NSData *)data forCharacteristic:(CBCharacteristic *)characteristic
{
    /*
    typedef NS_OPTIONS(NSUInteger, CBCharacteristicProperties) {
        CBCharacteristicPropertyBroadcast                                               = 0x01,
        CBCharacteristicPropertyRead                                                    = 0x02,
        CBCharacteristicPropertyWriteWithoutResponse                                    = 0x04,
        CBCharacteristicPropertyWrite                                                   = 0x08,
        CBCharacteristicPropertyNotify                                                  = 0x10,
        CBCharacteristicPropertyIndicate                                                = 0x20,
        CBCharacteristicPropertyAuthenticatedSignedWrites                               = 0x40,
        CBCharacteristicPropertyExtendedProperties                                      = 0x80,
        CBCharacteristicPropertyNotifyEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)     = 0x100,
        CBCharacteristicPropertyIndicateEncryptionRequired NS_ENUM_AVAILABLE(NA, 6_0)   = 0x200
    };
     打印出特征的權(quán)限(characteristic.properties),可以看到有很多種,這是一個(gè)NS_OPTIONS的枚舉,可以是多個(gè)值
     常見(jiàn)的又read,write,noitfy,indicate.知道這幾個(gè)基本夠用了,前倆是讀寫(xiě)權(quán)限,后倆都是通知,倆不同的通知方式
     */
    NSLog(@"%s, line = %d, characteristic.properties:%d", __FUNCTION__, __LINE__, characteristic.properties);

    // 只有特征的properties中有寫(xiě)的屬性時(shí)候,才寫(xiě)
    if (characteristic.properties & CBCharacteristicPropertyWrite) {
        // 這句才是正宗的核心代碼
        [peripheral writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
    }
}

6.訂閱特征的通知

// 設(shè)置通知
- (void)yf_peripheral:(CBPeripheral *)peripheral setNotifyForCharacteristic:(CBCharacteristic *)characteristic
{
    // 設(shè)置通知, 數(shù)據(jù)會(huì)進(jìn)入 peripheral:didUpdateValueForCharacteristic:error:方法
    [peripheral setNotifyValue:YES forCharacteristic:characteristic];
}
// 取消通知
- (void)yf_peripheral:(CBPeripheral *)peripheral cancelNotifyForCharacteristic:(CBCharacteristic *)characteristic
{
    [peripheral setNotifyValue:NO forCharacteristic:characteristic];
}

7.斷開(kāi)連接

// 7.斷開(kāi)連接
- (void)yf_cMgr:(CBCentralManager *)cMgr stopScanAndDisConnectWithPeripheral:(CBPeripheral *)peripheral
{
    // 停止掃描
    [cMgr stopScan];
    // 斷開(kāi)連接
    [cMgr cancelPeripheralConnection:peripheral];
}

BLE-periphral外設(shè)模式流程

之前在基礎(chǔ)知識(shí)介紹過(guò)BLE應(yīng)用的兩種流程,如圖:

• central模式用的都是左邊的類，而peripheral模式用的是右邊的類

peripheral模式的流程

• 1.引入CoreBluetooth框架,初始化peripheralManager
• 2.設(shè)置peripheralManager中的內(nèi)容
• 3.開(kāi)啟廣播advertising
• 4.對(duì)central的操作進(jìn)行響應(yīng)
  • 4.1 讀characteristics請(qǐng)求
  • 4.2 寫(xiě)characteristics請(qǐng)求
  • 4.4 訂閱和取消訂閱characteristics

具體操作步驟

1.引入CoreBluetooth框架,初始化peripheralManager

#import <CoreBluetooth/CoreBluetooth.h>
@interface XMGBLEPeripheralViewController () <CBPeripheralManagerDelegate>
@property (nonatomic, strong) CBPeripheralManager *pMgr; /**< 外設(shè)管理者 */
@end

@implementation XMGBLEPeripheralViewController
// 懶加載
- (CBPeripheralManager *)pMgr
{
    if (!_pMgr) {
        _pMgr = [[CBPeripheralManager alloc] initWithDelegate:self queue:dispatch_get_main_queue()];
    }
    return _pMgr;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // 調(diào)用get方法初始化,初始化后CBPeripheralManager狀態(tài)改變會(huì)調(diào)用代理方法peripheralManagerDidUpdateState:
    // 模擬器永遠(yuǎn)也不會(huì)是CBPeripheralManagerStatePoweredOn狀態(tài)
    [self pMgr];
}

2.設(shè)置peripheralManager中的內(nèi)容

• 創(chuàng)建characteristics及其description,
• 創(chuàng)建service,把characteristics添加到service中,
• 再把service添加到peripheralManager中

#pragma mark - CBPeripheralManagerDelegate
// CBPeripheralManager初始化后會(huì)觸發(fā)的方法
- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral
{
    if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
        // 提示設(shè)備成功打開(kāi)
        [SVProgressHUD showSuccessWithStatus:@"xmg設(shè)備打開(kāi)成功~"];
        // 配置各種服務(wù)入CBPeripheralManager
        [self yf_setupPMgr];
    }else
    {
        // 提示設(shè)備打開(kāi)失敗
        [SVProgressHUD showErrorWithStatus:@"失敗!"];
    }
}

#pragma mark - 私有方法
- (void)yf_setupPMgr
{
    // 特征描述的UUID
    CBUUID *characteristicUserDescriptionUUID = [CBUUID UUIDWithString:CBUUIDCharacteristicUserDescriptionString];
    // 特征的通知UUID
    CBUUID *notifyCharacteristicUUID = [CBUUID UUIDWithString:notiyCharacteristicStrUUID];
    // 特征的讀寫(xiě)UUID
    CBUUID *readwriteCharacteristicUUID = [CBUUID UUIDWithString:readwriteCharacteristicStrUUID];
    // 特征的只讀UUID
    CBUUID *readCharacteristicUUID = [CBUUID UUIDWithString:readwriteCharacteristicStrUUID];
    CBUUID *ser1UUID = [CBUUID UUIDWithString:Service1StrUUID];
    CBUUID *ser2UUID = [CBUUID UUIDWithString:Service2StrUUID];


    // 初始化一個(gè)特征的描述
    CBMutableDescriptor *des1 = [[CBMutableDescriptor alloc] initWithType:characteristicUserDescriptionUUID value:@"xmgDes1"];

    // 可通知的特征
    CBMutableCharacteristic *notifyCharacteristic = [[CBMutableCharacteristic alloc] initWithType:notifyCharacteristicUUID // UUID
                                                                                       properties:CBCharacteristicPropertyNotify // 枚舉:通知
                                                                                            value:nil // 數(shù)據(jù)先不傳
                                                                                      permissions:CBAttributePermissionsReadable]; // 枚舉:可讀
    // 可讀寫(xiě)的特征
    CBMutableCharacteristic *readwriteChar = [[CBMutableCharacteristic alloc] initWithType:readwriteCharacteristicUUID
                                                                                properties:CBCharacteristicPropertyRead | CBCharacteristicPropertyWrite
                                                                                     value:nil
                                                                               permissions:CBAttributePermissionsReadable | CBAttributePermissionsWriteable];
    [readwriteChar setDescriptors:@[des1]]; // 設(shè)置特征的描述

    // 只讀特征
    CBMutableCharacteristic *readChar = [[CBMutableCharacteristic alloc] initWithType:readCharacteristicUUID
                                                                           properties:CBCharacteristicPropertyRead
                                                                                value:nil
                                                                          permissions:CBAttributePermissionsReadable];

    // 初始化服務(wù)1
    CBMutableService *ser1 = [[CBMutableService alloc] initWithType:ser1UUID primary:YES];
    // 為服務(wù)設(shè)置倆特征(通知, 帶描述的讀寫(xiě))
    [ser1 setCharacteristics:@[notifyCharacteristic, readwriteChar]];

    // 初始化服務(wù)2,并且添加一個(gè)只讀特征
    CBMutableService *ser2 = [[CBMutableService alloc] initWithType:ser2UUID primary:YES];
    ser2.characteristics = @[readChar];

    // 添加服務(wù)進(jìn)外設(shè)管理者
    // 添加操作會(huì)觸發(fā)代理方法peripheralManager:didAddService:error:
    [self.pMgr addService:ser1];
    [self.pMgr addService:ser2];
}

3.開(kāi)啟廣播

// 添加服務(wù)進(jìn)CBPeripheralManager時(shí)會(huì)觸發(fā)的方法
- (void)peripheralManager:(CBPeripheralManager *)peripheral didAddService:(CBService *)service error:(NSError *)error
{
    // 由于添加了兩次ser,所以方法會(huì)調(diào)用兩次
    static int i = 0;
    if (!error) {
        i++;
    }

    // 當(dāng)?shù)诙芜M(jìn)入方法時(shí)候,代表兩個(gè)服務(wù)添加完畢,此時(shí)要用到2,由于沒(méi)有擴(kuò)展性,所以新增了可變數(shù)組,記錄添加的服務(wù)數(shù)量
    if (i == self.servieces.count) {
        // 廣播內(nèi)容
        NSDictionary *advertDict = @{CBAdvertisementDataServiceUUIDsKey: [self.servieces valueForKeyPath:@"UUID"],
                                     CBAdvertisementDataLocalNameKey:LocalNameKey};
        // 發(fā)出廣播,會(huì)觸發(fā)peripheralManagerDidStartAdvertising:error:
        [peripheral startAdvertising:advertDict];
    }
}
// 開(kāi)始廣播觸發(fā)的代理
- (void)peripheralManagerDidStartAdvertising:(CBPeripheralManager *)peripheral error:(NSError *)error
{

}

>>>>>>>>分割線>>>>下面是修改的地方

@property (nonatomic, strong) NSMutableArray *servieces; /**< 服務(wù)可變數(shù)組 */
// 自定義服務(wù)
- (NSMutableArray *)servieces
{
    if (!_servieces) {
        _servieces = [NSMutableArray array];
    }
    return _servieces;
}
#pragma mark - 私有方法
- (void)yf_setupPMgr
{
    ...

    // 初始化服務(wù)1
    CBMutableService *ser1 = [[CBMutableService alloc] initWithType:ser1UUID primary:YES];
    // 為服務(wù)設(shè)置倆特征(通知, 帶描述的讀寫(xiě))
    [ser1 setCharacteristics:@[notifyCharacteristic, readwriteChar]];
    [self.servieces addObject:ser1];

    // 初始化服務(wù)2,并且添加一個(gè)只讀特征
    CBMutableService *ser2 = [[CBMutableService alloc] initWithType:ser2UUID primary:YES];
    ser2.characteristics = @[readChar];
    [self.servieces addObject:ser2];

    // 添加服務(wù)進(jìn)外設(shè)管理者
    // 添加操作會(huì)觸發(fā)代理方法peripheralManager:didAddService:error:
    if (self.servieces.count) {
        for (CBMutableService *ser in self.servieces) {
            [self.pMgr addService:ser];
        }
    }
}

4.對(duì)central的操作做出響應(yīng)

• 4.1 讀characteristics請(qǐng)求
• 4.2 寫(xiě)characteristics請(qǐng)求
• 4.3 訂閱和取消訂閱characteristics

// 外設(shè)收到讀的請(qǐng)求,然后讀特征的值賦值給request
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveReadRequest:(CBATTRequest *)request
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
    // 判斷是否可讀
    if (request.characteristic.properties & CBCharacteristicPropertyRead) {
        NSData *data = request.characteristic.value;

        request.value = data;
        // 對(duì)請(qǐng)求成功做出響應(yīng)
        [self.pMgr respondToRequest:request withResult:CBATTErrorSuccess];
    }else
    {
        [self.pMgr respondToRequest:request withResult:CBATTErrorWriteNotPermitted];
    }
}
// 外設(shè)收到寫(xiě)的請(qǐng)求,然后讀request的值,寫(xiě)給特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral didReceiveWriteRequests:(NSArray<CBATTRequest *> *)requests
{
    NSLog(@"%s, line = %d, requests = %@", __FUNCTION__, __LINE__, requests);
    CBATTRequest *request = requests.firstObject;
    if (request.characteristic.properties & CBCharacteristicPropertyWrite) {
        NSData *data = request.value;
        // 此處賦值要轉(zhuǎn)類型,否則報(bào)錯(cuò)
        CBMutableCharacteristic *mChar = (CBMutableCharacteristic *)request.characteristic;
        mChar.value = data;
        // 對(duì)請(qǐng)求成功做出響應(yīng)
        [self.pMgr respondToRequest:request withResult:CBATTErrorSuccess];
    }else
    {
        [self.pMgr respondToRequest:request withResult:CBATTErrorWriteNotPermitted];
    }
}


// 與CBCentral的交互
// 訂閱特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didSubscribeToCharacteristic:(CBCharacteristic *)characteristic
{
    NSLog(@"%s, line = %d, 訂閱了%@的數(shù)據(jù)", __FUNCTION__, __LINE__, characteristic.UUID);
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0
                                                      target:self
                                                    selector:@selector(yf_sendData:)
                                                    userInfo:characteristic
                                                     repeats:YES];

    self.timer = timer;

    /* 另一種方法 */
//    NSTimer *testTimer = [NSTimer timerWithTimeInterval:2.0
//                                                 target:self
//                                               selector:@selector(yf_sendData:)
//                                               userInfo:characteristic
//                                                repeats:YES];
//    [[NSRunLoop currentRunLoop] addTimer:testTimer forMode:NSDefaultRunLoopMode];

}
// 取消訂閱特征
- (void)peripheralManager:(CBPeripheralManager *)peripheral central:(CBCentral *)central didUnsubscribeFromCharacteristic:(CBCharacteristic *)characteristic
{
    NSLog(@"%s, line = %d, 取消訂閱了%@的數(shù)據(jù)", __FUNCTION__, __LINE__, characteristic.UUID);
    [self.timer invalidate];
    self.timer = nil;
}

- (void)peripheralManagerIsReadyToUpdateSubscribers:(CBPeripheralManager *)peripheral
{
    NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}

// 計(jì)時(shí)器每隔兩秒調(diào)用的方法
- (BOOL)yf_sendData:(NSTimer *)timer
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"yy:MM:dd:HH:mm:ss";

    NSString *now = [dateFormatter stringFromDate:[NSDate date]];
    NSLog(@"now = %@", now);

    // 執(zhí)行回應(yīng)central通知數(shù)據(jù)
    return  [self.pMgr updateValue:[now dataUsingEncoding:NSUTF8StringEncoding]
         forCharacteristic:timer.userInfo
      onSubscribedCentrals:nil];
}