系统分类

iOS 设备，同一时间，只能处于某一种状态：作为中心设备，或者作为周边设备；
一般情况：iOS设备链接智能硬件，使用时作为中心设备，与硬件交互；
玩家对战，当面传输：一个作为中心，一个作为周边设备；

CBCentralManager - 中心设备管理，用于搜索周边设备，对应CBPeripheral使用
CBPeripheralManager - 周边设备管理，用于作为周边设备，对应CBCentral使用

CBPeripheral - 周边设备
CBCentral - 中心设备

CBService - 设备 服务
CBCharacteristic - 设备 服务 特征 
CBDescriptor - 设备 服务 特征 描述

CBError - 错误
CBUUID - 唯一码
CBAdvertisementData - 
CBATTRequest -

CBCentralManager 中心管理

1 初始化扫描周边设备

    // 初始化 manager
    self.centerManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
    // [self.centerManager stopScan];  可以停止扫描

- (void)centralManagerDidUpdateState:(CBCentralManager *)central {
    if (central.state == CBCentralManagerStatePoweredOn) {
        NSLog(@"蓝牙 - 打开");
        // 开始扫描，周边设备
        [self.centerManager scanForPeripheralsWithServices:nil options:nil];
    } else {
        NSLog(@"蓝牙 异常,其他状态自行判断");
    }
}

- (void)centralManager:(CBCentralManager *)central willRestoreState:(NSDictionary<NSString *, id> *)dict {
    NSLog(@"%@",dict);
}

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *, id> *)advertisementData RSSI:(NSNumber *)RSSI {
    if (peripheral.name) {
        NSLog(@"扫描到设备 %@",peripheral.name);
    }
}

2 连接设备

    // 某处，调用链接设备
    [self.centerManager connectPeripheral:currentPer options:nil];                       
    currentPer.delegate = self;

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
    NSLog(@"链接成功");
}

- (void)centralManager:(CBCentralManager *)central didFailToConnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error {
    NSLog(@"链接失败");
}

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(nullable NSError *)error {
    NSLog(@"设备断开链接");
}

CBPeripheral 设备信息

属性

delegate：代理 
name：设备名称
RSSI：设备信号强度
state：设备链接状态
services：设备提供的服务

下面，方法都对应了代理

扫描设备的某些 UUID 的服务

    [currentPer discoverServices:@[@"UUID"]];

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(nullable NSError *)error {
    NSLog(@"%@",service.UUID);
}

扫描设备的某服务的 UUID 服务？

    [currentPer discoverIncludedServices:@[] forService:service];
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverIncludedServicesForService:(CBService *)service error:(NSError *)error {
    NSLog(@"%@",service.UUID);
}

扫描设备的某个服务中的 UUID 特性

    [peripheral discoverCharacteristics:@[] forService:peripheral.services.lastObject];
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(nullable NSError *)error {
    NSLog(@"%@",service.characteristics);
}

扫描设备的某个特征 UUID

    [peripheral discoverDescriptorsForCharacteristic:peripheral.services.lastObject.characteristics.lastObject];
- (void)peripheral:(CBPeripheral *)peripheral didDiscoverDescriptorsForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error {
    NSLog(@"%@",characteristic);
}

获取设备蓝牙信号强度

    [peripheral readRSSI];
- (void)peripheral:(CBPeripheral *)peripheral didReadRSSI:(NSNumber *)RSSI error:(nullable NSError *)error {
    NSLog(@"%@",RSSI.stringValue);
}

读取特征

    [peripheral readValueForCharacteristic:peripheral.services.lastObject.characteristics.lastObject];
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
    NSLog(@"%@",characteristic);
}

读取描述

    [peripheral readValueForDescriptor:peripheral.services.lastObject.characteristics.lastObject.descriptors.lastObject];
- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForDescriptor:(CBDescriptor *)descriptor error:(nullable NSError *)error {
    NSLog(@"%@",descriptor);
}

添加监听

    [peripheral setNotifyValue:YES forCharacteristic:peripheral.services.lastObject.characteristics.lastObject];
- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error {
    NSLog(@"%@",characteristic);
}

写入描述

    [peripheral writeValue:[NSData data] forDescriptor:peripheral.services.lastObject.characteristics.lastObject.descriptors.lastObject];
- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForDescriptor:(CBDescriptor *)descriptor error:(nullable NSError *)error {
    NSLog(@"%@",descriptor);
}

写入特征

    [peripheral writeValue:[NSData data] forCharacteristic:peripheral.services.lastObject.characteristics.lastObject type:CBCharacteristicWriteWithResponse];
- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(nullable NSError *)error {
    NSLog(@"%@",characteristic);
}

其他

    // 最大数据量？
    NSLog(@"%zi",[peripheral maximumWriteValueLengthForType:CBCharacteristicWriteWithResponse]);
    
// 修改 名称
- (void)peripheralDidUpdateName:(CBPeripheral *)peripheral {
    NSLog(@"%@",peripheral);
}

// 修改 服务
- (void)peripheral:(CBPeripheral *)peripheral didModifyServices:(NSArray<CBService *> *)invalidatedServices {
    NSLog(@"%@",peripheral);
}

// 修改 RSSI
- (void)peripheralDidUpdateRSSI:(CBPeripheral *)peripheral error:(nullable NSError *)error {
    NSLog(@"%@",peripheral.RSSI.stringValue);
}

CBService CBMutableService 服务

作为中心获取，作为周边创建

    // 服务 包含 的 服务
    for (CBService *ser in service.includedServices) {
        NSLog(@"%@",ser.UUID);
    }
    
    // 服务 包含特征
    for (CBCharacteristic *charcter in service.characteristics) {
        NSLog(@"%@",charcter.UUID);
    }

CBCharacteristic CBMutableCharacteristic 特征

作为中心获取，作为周边创建

    CBCharacteristicProperties property = characteristic.properties;// 读写等属性
    
    NSData *data = characteristic.value;// 特征数据
    
    // 特征 包含的描述
    for (CBDescriptor *desc in characteristic.descriptors) {
        NSLog(@"%@",desc.UUID);
    }