蓝牙开发笔记

//把数据写到Characteristic中
//写数据
-(void)writeCharacteristic:(CBPeripheral *)peripheral
            characteristic:(CBCharacteristic *)characteristic
                     value:(NSData *)value{
    //打印出 characteristic 的权限，可以看到有很多种，这是一个NS_OPTIONS，就是可以同时用于好几个值，常见的有read，write，notify，indicate，知知道这几个基本就够用了，前连个是读写权限，后两个都是通知，两种不同的通知方式。
    /*
     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
     };
     */
    [self writeTolog:[NSString stringWithFormat:@"%lu", (unsigned long)characteristic.properties]];
    //只有 characteristic.properties 有write的权限才可以写
    if(characteristic.properties & CBCharacteristicPropertyWrite){
        /*
         最好一个type参数可以为CBCharacteristicWriteWithResponse或type:CBCharacteristicWriteWithResponse,区别是是否会有反馈
         */
        [peripheral writeValue:value forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
    }else{
        NSLog(@"该字段不可写！");
    }
}

 //1. 创建中心设备管理者,并且设置代理
 //初始化方式一:,不会提示出现"打开蓝牙允许'xxxx'连接都配件"的系统提示
   _myCentralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil options:nil];
   //初始化方式二
   _myCentralManager = [[CBCentralManager alloc] initWithDelegate:self queue:nil];