[BlueZ] 2、使用bluetoothctl搜索、连接、配对、读写、使能notify蓝牙低功耗设备

星期三, 05. 九月 2018 02:03上午 - beautifulzzzz

1、前言

上一篇讲了如何编译安装BlueZ-5，本篇主要在于玩BlueZ，用命令行去操作BLE设备：

• [BlueZ] 1、Download install and use the BlueZ and hcitool on PI 3B+

2、gatttool —— 老工具趟坑

刚开始跟着 Get Started with Bluetooth Low Energy on Linux 操作gatttool，发现坑太多（主要原因是工具老了）：

采用sudo gatttool -b 4D:69:98:0E:91:5E -I去连接
Error: connect error: Connection refused (111)
(#1)^：

➜
~
sudo gatttool -b 4D:69:98:0E:91:5E -I
[4D:69:98:0E:91:5E][LE]> connect
Attempting to connect to 4D:69:98:0E:91:5E
Error: connect error: Connection refused (111)
[4D:69:98:0E:91:5E][LE]> exit
➜
~
sudo gatttool
-t random
-b 4D:69:98:0E:91:5E -I
[4D:69:98:0E:91:5E][LE]> connect
Attempting to connect to 4D:69:98:0E:91:5E
Connection successful
[4D:69:98:0E:91:5E][LE]>
(gatttool:3104): GLib-WARNING **: Invalid file descriptor.

过一回会10S自动断开，网上说这个工具老了，不建议用了^(#2):

There are new tools to use with GATT, bluetoothctl/bluetoothd is the preferred since with that you have GAP, etc,
but if want to use a stand alone tool then I suggest you use btgatt-client.

3、bluetoothctl——NB的新工具

命令行进入bluetoothctl操作环境^(#6)：

bluetoothctl

我在手机上用lightblue模拟一个BLE设备ty_prod，之后对其service进行修改，调用scan on进行搜索还是老的，
[NEW] Device 72:3B:E1:81:4E:4F ty_prod设备注： 用lightblue模拟的设备的MAC不是固定的注： 我发现在lightblue中无论怎么模拟BLE设备，一旦被连上搜索到的service都是IPone的

[bluetooth]# devices
Device 28:ED:6A:A0:26:B7 ty_prod
Device 58:71:33:00:00:24 Bluetooth Keyboard
Device 00:1A:7D:DA:71:0A SHEN-PC
Device 94:87:E0:B3:AC:6F Mi Phone
[bluetooth]# remove 28:ED:6A:A0:26:B7
...
[bluetooth]# scan on
Discovery started
[NEW] Device 72:3B:E1:81:4E:4F ty_prod
[bluetooth]# scan off
...
Discovery stopped
[bluetooth]# connect 72:3B:E1:81:4E:4F
Attempting to connect to 72:3B:E1:81:4E:4F
[CHG] Device 72:3B:E1:81:4E:4F Connected: yes
Connection successful
[ty_prod]

索性就用IPhone自带的服务做测试了~

[ty_prod]# info
Device 28:ED:6A:A0:26:B7 (public)
Name: tuya_mdev_test
Alias: tuya_mdev_test
Appearance: 0x0040
Icon: phone
Paired: yes
Trusted: no
Blocked: no
Connected: yes
LegacyPairing: no
UUID: Fax
(00001111-0000-1000-8000-00805f9b34fb)
UUID: Generic Access Profile
(00001800-0000-1000-8000-00805f9b34fb)
UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
UUID: Current Time Service
(00001805-0000-1000-8000-00805f9b34fb)
UUID: Device Information
(0000180a-0000-1000-8000-00805f9b34fb)
UUID: Battery Service
(0000180f-0000-1000-8000-00805f9b34fb)
UUID: Vendor specific
(7905f431-b5ce-4e99-a40f-4b1e122d00d0)
UUID: Vendor specific
(89d3502b-0f36-433a-8ef4-c502ad55f8dc)
UUID: Vendor specific
(9fa480e0-4967-4542-9390-d343dc5d04ae)
UUID: Vendor specific
(d0611e78-bbb4-4591-a5f8-487910ae4366)
[CHG] Device 28:ED:6A:A0:26:B7 ServicesResolved: no
[CHG] Device 28:ED:6A:A0:26:B7 Connected: no

我们用Current Time Service，列出所有attributes操作如下：

[tuya_mdev_test]# menu gatt
[tuya_mdev_test]# list-attributes 28:ED:6A:A0:26:B7
...
Primary Service
/org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041
00001805-0000-1000-8000-00805f9b34fb
Current Time Service
Characteristic
/org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041/char0045
00002a0f-0000-1000-8000-00805f9b34fb
Local Time Information
Characteristic
/org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041/char0042
00002a2b-0000-1000-8000-00805f9b34fb
Current Time
Descriptor
/org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041/char0042/desc0044
00002902-0000-1000-8000-00805f9b34fb
Client Characteristic Configuration
...

上面Current Time Service对应的服务如下图：

我们选择Current Time进行操作UUID：0x2A2B

[ty_prod]# select-attribute /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041/char0042
[tuya_mdev_test:/service0041/char0042]# read
Attempting to read /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041/char0042
[CHG] Attribute /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041/char0042 Value:
e2 07 09 05 01 24 11 03 f1 02
.....$....
e2 07 09 05 01 24 11 03 f1 02
.....$....
[tuya_mdev_test:/service0041/char0042]# attribute-info
Characteristic - Current Time
UUID: 00002a2b-0000-1000-8000-00805f9b34fb
Service: /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0041
Value:
e2 07 09 05 01 2e 01 03 f5 02
..........
Notifying: yes
Flags: read
Flags: notify

读出结果大致意思应该是：2018-9/5-1:36:17 周三

读取一下0x180A的Device Information:

[tuya_mdev_test:/service0006/char0007]# select-attribute /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0047/char004a
[tuya_mdev_test:/service0047/char004a]# attribute-info
Characteristic - Model Number String
UUID: 00002a24-0000-1000-8000-00805f9b34fb
Service: /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0047
Flags: read
[tuya_mdev_test:/service0047/char004a]# read
Attempting to read /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0047/char004a
[CHG] Attribute /org/bluez/hci0/dev_47_B1_26_C1_81_18/service0047/char004a Value:
69 50 68 6f 6e 65 36 2c 32
iPhone6,2
69 50 68 6f 6e 65 36 2c 32
iPhone6,2

当然写、使能notify也很简单，看help即可。最后断开连接、并退出！！！

[tuya_mdev_test:/service0047/char004a]# disconnect 28:ED:6A:A0:26:B7
Attempting to disconnect from 28:ED:6A:A0:26:B7
[CHG] Device 28:ED:6A:A0:26:B7 ServicesResolved: no
Successful disconnected
[CHG] Device 28:ED:6A:A0:26:B7 Connected: no
[bluetooth]# quit

LINKS

[1].Cannot connect to BLE device on Raspberry Pi

@beautifulzzzz
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