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CBCharacteristic
Identifying a Characteristic
@property(readonly, nonatomic) CBUUID *UUID@property(weak, readonly, nonatomic) CBService *service
Accessing Characteristic Data
@property(retain, readonly) NSData *value//例如体温检测服务，value为温度@property(retain, readonly) NSArray *descriptors//CBDescriptor对象数组，value外的其他值等@property(readonly, nonatomic) CBCharacteristicProperties properties//The properties of a characteristic determine how the characteristic’s value and descriptors can be used and accessed. @property(readonly) BOOL isNotifying@property(readonly) BOOL isBroadcasted//IOS8以后不使用
Constants
typedef enum { CBCharacteristicPropertyBroadcast = 0x01 , CBCharacteristicPropertyRead = 0x02 , CBCharacteristicPropertyWriteWithoutResponse = 0x04 , CBCharacteristicPropertyWrite = 0x08 , CBCharacteristicPropertyNotify = 0x10 , CBCharacteristicPropertyIndicate = 0x20 , CBCharacteristicPropertyAuthenticatedSignedWrites = 0x40 , CBCharacteristicPropertyExtendedProperties = 0x80 , CBCharacteristicPropertyNotifyEncryptionRequired = 0x100 , CBCharacteristicPropertyIndicateEncryptionRequired = 0x200 ,} CBCharacteristicProperties;Values representing the possible properties of a characteristic. Since characteristic properties can be combined, a characteristic may have multiple property values set.
1.read，调用readValueForCharacteristic方法，然后数据更新的时候会调用peripheral:didUpdateValueForCharacteristic:error:方法。此时读取value值即可。
2.write，使用 writeValue:forCharacteristic:type:方法写数据。type值表明是否有response。（没有response的比有response的数值可以更长？）
CBCharacteristic
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