Linux Bluetooth

DART-6UL/VAR-SOM-MX7 - 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:   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. Type help to show commands.

root@var-som-mx6:~# hcitool dev
Devices:
        hci0    64:A3:CB:5B:69:F0

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]# 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:

root@var-som-mx6:~# 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]
root@var-som-mx6:~#

File Transfer

Sending a file from the board to the bluetooth device using the obex transfer.

1) First, establish connection to the device as described above.

2) Start obex daemon and obexctl. Type help to show commands.

$ export DISPLAY=:0.0
$ /usr/lib/bluez5/bluetooth/obexd &
$ obexctl

3) connect to Device

[obex]# connect <mac addr>

4) Send a file from obexctl to the device

[<mac addr>]# send <file>

5) Once it's done, close the session

[<mac addr>]# disconnect
[<mac addr>]# quit