# ble開發觀念&&藍芽開發工具

## 基礎觀念

### spp-serial port profile(classic bluetooth)

[範例用途解說](https://wenku.csdn.net/answer/67k5gjkum9)

### gatt & gap (ble)
gatt server esp32參考專案:gatt_server_service_table

gatt clinet esp32參考專案:gatt_client

1. gatt定義了service和character
2. gap讓周遭的設備被知道，然後用gatt形成連接
3. gatt形成後server(週邊)和clinet(中心)會定期發封包確定連線狀況

[gap 和gatt觀念解析](https://blog.csdn.net/liwei16611/article/details/80958842)

* read/write是client主动发起，notification/indication是server端主动发起
* notification不需要client回ack，但indication要回ack
[Indication and Notification](https://community.nxp.com/t5/Wireless-Connectivity-Knowledge/Indication-and-Notification/ta-p/1129270)

rfkill list - 顯示目前的無線裝置
rfkill unblock 1 - 活化裝置
hciconfig hci0 up - 讓hci裝置界面啟動

hcitool lescan - 搜尋ble裝置

## 工具
### bluetoothctl
* power on
* agent
* scan on
* pair [mac address]
* connect [mac address]
* disconect [mac address]
* remove [mac address]

### gatttool
適用於gatt client

gatttool -b [MAC Address] -I (interactive)
//連接ble裝置
connect
// 看service
primary
// 看特徵(characteristics)
characteristic
//寫入(properties:0x08,write)
char-write-req 0x0010(characteristic handler) 
char-write-cmd 0x0010 01
//寫入(properties:0x02,read)
char-read-uuid uuid

---
適用於建立gatt server

bluetoothctl
# set advertise information
menu advertise
name name_data
manufacturer 0xffff 0x11 0x33
back
#set gatt information
menu gatt
register-service 0xFFFF
register-characteristic 0xAAAA read
register-characteristic 0xBBBB read,write
register-characteristic 0xCCCC read
register-application  
back
advertise on

[參考資料1](https://blog.csdn.net/love131452098/article/details/116258471)
[參考資料2](https://itecnote.com/tecnote/linux-bluez-how-to-set-up-a-gatt-server-from-the-command-line/)

---

## 參考資料
[1. Raspberry Pi IoT無線傳輸技術介紹 - Bluetooth篇](https://www.slideshare.net/raspberrypi-tw/raspberry-pi-iot-bluetooth)
[2. 樹莓派 - 藍牙 （1） 試試Beacon](https://www.twblogs.net/a/5b8179c02b71772165acc682)
[3. 在 Linux 下使用 rfkill 软开关蓝牙及无线功能](https://linux.cn/article-5957-1.html)
[4. 【蓝牙】蓝牙，调试 hcitool与gatttool实例](https://www.cnblogs.com/chenxiaomeng/p/9128565.html)
[5. 蓝牙工具hcitool和gatttool的使用](https://blog.csdn.net/Chuck_lin/article/details/78846165)
[6.BLE 測試工具: bluez gatttool](https://www.dazhuanlan.com/2019/12/13/5df2eb0cf1db4/)
[7. An Introduction to Bluetooth Programming](https://people.csail.mit.edu/albert/bluez-intro/index.html)
[8. RPi Bluetooth LE](https://elinux.org/RPi_Bluetooth_LE)
[9.藍牙技術-L2CAP介紹](https://tingchuchi.github.io/2018/01/30/bluetooth-ch6/)
###### tags: `nrf52` `bluetooth` `ble`