藍芽傳輸協定：GATT (Generic Attribute Profile)
===
* 角色
* GATT Server/ Peripheral： BLE device
* GATT Client/ Central： 手機
* 未配對情況下，BLE device 會一直廣播，直到手機發送 request 給 BLE device，等待 BLE device 回傳 response。
* 定義：
uuid 0x2800 is Service
uuid 0x2803 is Characteristics

## Ref.
[概述 GATT 藍芽傳輸](https://medium.com/@nalydadad/%E6%A6%82%E8%BF%B0-gatt-%E8%97%8D%E8%8A%BD%E5%82%B3%E8%BC%B8-9fa218ce6022
)
[假日藍芽工程師: GATT protocol
](http://lihgong.blogspot.com/2014/10/gatt-protocol.html)

###### tags: `介紹`