Linux Bluetooth
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Bluetooth
Bluetooth boot messages
During boot the following Bluetooth kernel messages are received:
# dmesg | grep -i Bluetooth Bluetooth: Core ver 2.18 Bluetooth: HCI device and connection manager initialized Bluetooth: HCI socket layer initialized Bluetooth: L2CAP socket layer initialized Bluetooth: SCO socket layer initialized Bluetooth: HCI UART driver ver 2.2 Bluetooth: HCI H4 protocol initialized Bluetooth: HCI BCSP protocol initialized Bluetooth: HCIATH3K protocol initialized Bluetooth: RFCOMM TTY layer initialized Bluetooth: RFCOMM socket layer initialized Bluetooth: RFCOMM ver 1.11 Bluetooth: BNEP (Ethernet Emulation) ver 1.3 Bluetooth: BNEP filters: protocol multicast Bluetooth: BNEP socket layer initialized Bluetooth: HIDP (Human Interface Emulation) ver 1.2 Bluetooth: HIDP socket layer initialized
Device identification
After the File system is up 'hciconfig' should show the connected bluetooth module.
# hciconfig hci0 up
# hciconfig
hci0: Type: BR/EDR Bus: UART
BD Address: 64:A3:CB:5B:69:F0 ACL MTU: 1021:8 SCO MTU: 64:1
UP RUNNING PSCAN
RX bytes:1772 acl:0 sco:0 events:69 errors:0
TX bytes:1152 acl:0 sco:0 commands:65 errors:0
The hcitool can be used to show the Bluetooth MAC address of the Bluetooth module with the respective hci connection.
# hcitool dev
Devices:
hci0 64:A3:CB:5B:69:F0
Type help to show commands.
# hcitool --help
Managing bluetooth
You can manage bluetooth with bluetoothctl, type 'bluetoothctl' and enter the interface. Type help to show commands.
For connecting a device do the following:
# bluetoothctl [bluetooth]# power on [bluetooth]# agent off [bluetooth]# agent on [bluetooth]# default-agent [bluetooth]# pairable on Push the connect button in the device [bluetooth]# scan on Copy mac address [bluetooth]# scan off [bluetooth]# pair <mac address> Approve pairing on Device if required [bluetooth]# trust <mac address> [bluetooth]# connect <mac address> [bluetooth]# quit
For example when connecting a microsoft bluetooth mouse the following is done:
# bluetoothctl
[NEW] Controller 50:72:24:11:EF:B0 BlueZ 5.28 [default]
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# default-agent
No agent is registered
[bluetooth]# pairable on
Changing pairable on succeeded
[bluetooth]# scan on
Discovery started
[CHG] Controller 50:72:24:11:EF:B0 Discovering: yes
[NEW] Device 00:1D:D8:39:93:46 Microsoft Bluetooth Notebook Mouse 5000
[bluetooth]# scan off
[CHG] Device 00:1D:D8:39:93:46 RSSI is nil
Discovery stopped
[CHG] Controller 50:72:24:11:EF:B0 Discovering: no
[bluetooth]# pair 00:1D:D8:39:93:46
Attempting to pair with 00:1D:D8:39:93:46
[CHG] Device 00:1D:D8:39:93:46 Connected: yes
[CHG] Device 00:1D:D8:39:93:46 Modalias: usb:v045Ep0700d0100
[CHG] Device 00:1D:D8:39:93:46 UUIDs:
00001000-0000-1000-8000-00805f9b34fb
00001124-0000-1000-8000-00805f9b34fb
00001200-0000-1000-8000-00805f9b34fb
[CHG] Device 00:1D:D8:39:93:46 Paired: yes
Pairing successful
[CHG] Device 00:1D:D8:39:93:46 Connected: no
[bluetooth]# trust 00:1D:D8:39:93:46
[CHG] Device 00:1D:D8:39:93:46 Trusted: yes
Changing 00:1D:D8:39:93:46 trust succeeded
[bluetooth]# connect 00:1D:D8:39:93:46
Attempting to connect to 00:1D:D8:39:93:46
[CHG] Device 00:1D:D8:39:93:46 Connected: yes
[bluetooth]# hid-generic 0005:045E:0700.0001: unknown main item tag 0x0
input: Microsoft Bluetooth Notebook Mouse 5000 as /devices/soc0/soc.0/2100000.aips-bus/21e8000.serial/tty/ttymxc1/hci0/hci0:1/0005:045E:0700.0001/input/input1
Connection successful
[bhid-generic 0005:045E:0700.0001: input: BLUETOOTH HID v1.00 Mouse [Microsoft Bluetooth Notebook Mouse 5000] on 50:72:24:11:ef:b0
[bluetooth]# quit
[DEL] Controller 50:72:24:11:EF:B0 BlueZ 5.28 [default]
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