Bluetooth¶
EC-A1684JD4 supports wireless bluetooth, you can display the bluetooth device information through hciconfig -a command:
linaro@bm1684:~$ hciconfig -a
hci0: Type: Primary Bus: USB
BD Address: 20:57:9E:BA:7C:EC ACL MTU: 1021:8 SCO MTU: 255:16
UP RUNNING
RX bytes:650 acl:0 sco:0 events:41 errors:0
TX bytes:2170 acl:0 sco:0 commands:41 errors:0
Features: 0xff 0xff 0xff 0xfa 0xdb 0xbd 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'bm1684'
Class: 0x000000
Service Classes: Unspecified
Device Class: Miscellaneous,
HCI Version: 4.2 (0x8) Revision: 0xaba8
LMP Version: 4.2 (0x8) Subversion: 0xa0cd
Manufacturer: Realtek Semiconductor Corporation (93)
Note that if the following error message is printed:
Can't open HCI socket.: Address family not supported by protocol
Then there may be a problem with the dependencies of the loadable modules. At this time, reload the dependencies and soft restart:
sudo -i
depmod -a
reboot
Check whether it is currently the master device or the slave device:
linaro@bm1684:~$ hciconfig hci0 lm
hci0: Type: Primary Bus: USB
BD Address: 20:57:9E:BA:7C:EC ACL MTU: 1021:8 SCO MTU: 255:16
Link mode: SLAVE ACCEPT # slave device
Start the PulseAudio service as a media device:
linaro@bm1684:~$ pulseaudio --start --log-target=syslog
The steps to connect a Bluetooth device are as follows:
(1) Start the Bluetooth controller tool:
linaro@bm1684:~$ bluetoothctl
[NEW] Controller 20:57:9E:BA:7C:EC bm1684 [default]
(2) Power on the Bluetooth controller:
[bluetooth]# power on
Changing power on succeeded
(3) Set the bluetooth agent as default:
[bluetooth]# agent on
Agent registered
[bluetooth]# default-agent
Default agent request successful
(4) Open to be discovered by other Bluetooth devices:
[bluetooth]# discoverable on
Changing discoverable on succeeded
[CHG] Controller 20:57:9E:BA:7C:EC Discoverable: yes
(5) At this point, the EC-A1684JD4 Bluetooth device can be found on the smartphone, and the phone can be paired after clicking:
[NEW] Device A4:90:CE:DF:64:4F iQOO Neo6 SE
[CHG] Device A4:90:CE:DF:64:4F Modalias: bluetooth:v001Dp1200d1436
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001105-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 0000110a-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 0000110c-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 0000110e-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001112-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001115-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001116-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 0000111f-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 0000112d-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 0000112f-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001132-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001200-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001800-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 00001801-0000-1000-8000-00805f9b34fb
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 2c042b0a-7f57-4c0a-afcf-1762af70257c
[CHG] Device A4:90:CE:DF:64:4F UUIDs: 8fa9c715-bd1f-596c-a1b0-13162b15c892
[CHG] Device A4:90:CE:DF:64:4F ServicesResolved: yes
[CHG] Device A4:90:CE:DF:64:4F Paired: yes
[CHG] Device A4:90:CE:DF:64:4F ServicesResolved: no
[CHG] Device A4:90:CE:DF:64:4F Connected: no
[CHG] Controller 20:57:9E:BA:7C:EC Discoverable: no
(6) Connect mobile device:
[bluetooth]# connect A4:90:CE:DF:64:4F
Attempting to connect to A4:90:CE:DF:64:4F
[CHG] Device A4:90:CE:DF:64:4F Connected: yes
Connection successful
[CHG] Device A4:90:CE:DF:64:4F ServicesResolved: yes
[iQOO Neo6 SE]#
(7) Set the mobile device to trust:
[iQOO Neo6 SE]# trust A4:90:CE:DF:64:4F
[CHG] Device A4:90:CE:DF:64:4F Trusted: yes
Changing A4:90:CE:DF:64:4F trust succeeded
Bluetooth Audio¶
Bluetooth audio is available using the bluez-alsa tool, a Bluetooth audio ALSA backend utility.
Install the bluez-alsa tool¶
EC-A1684JD4 does not have this tool installed by default, and users need to compile and install it by themselves. Here are the steps for version 1.3.0, as follows:
(1) Download the source package: https://github.com/Arkq/bluez-alsa/releases/tag/v1.3.0
(2) Installation dependencies:
sudo apt install -y libasound2-dev libbluetooth-dev libglib2.0-dev libsbc-dev libfdk-aac-dev pkgconf
(3) Extract:
tar xzvf bluez-alsa-1.3.0.tar.gz
cd bluez-alsa-1.3.0
(4) Compile and install:
autoreconf --install
mkdir build && cd build
../configure --enable-aac --enable-debug
make && make install
Audio Test¶
After the installation is complete, you can connect a Bluetooth headset or speaker to play music. First, configure Bluetooth as the master device mode:
sudo hciconfig hci0 lm master
Enable the bluez-alsa service, note that the PulseAudio service and bluez-alsa are mutually exclusive:
# Remove the PulseAudio process
killall pulseaudio
# Open the bluez-alsa service for connecting to bluetooth
bluealsa -p a2dp-source -p hsp-ag &
To connect a Bluetooth headset:
[bluetooth]# connect 0C:AE:BD:9B:BB:5C
Attempting to connect to 0C:AE:BD:9B:BB:5C
[CHG] Device 0C:AE:BD:9B:BB:5C Connected: yes
Connection successful
[CHG] Device 0C:AE:BD:9B:BB:5C ServicesResolved: yes
[EDIFIER LolliPods 2022版]#
In addition, open a login and execute the following command to play the audio:
aplay -D bluealsa:HCI=hci0,DEV=0C:AE:BD:9B:BB:5C,PROFILE=a2dp example.wav
For more information about bluez-alsa, please refer to the source code repository: https://github.com/Arkq/bluez-alsa/tree/v1.3.0。
Send and receive files¶
Bluetooth file sending and receiving can use the OBEX protocol, which encapsulates information data with an object model and transmits applications with a session protocol specification.
The Obex service is needed in Linux. Firstly, connect the EC-A1684JD4 to the Bluetooth device according to the previous steps, then start the Obex daemon, and set the receiving directory to /home/linaro/:
/usr/lib/bluetooth/obexd -r /home/linaro -a -d &
Use obex push service¶
First configure Bluetooth as master device mode:
sudo hciconfig hci0 lm master
Find the channel for the Obex Push service on your mobile phone:
linaro@bm1684:~$ sdptool search --bdaddr A4:90:CE:DF:64:4F OPUSH
Searching for OPUSH on A4:90:CE:DF:64:4F ...
Service Name: OBEX Object Push
Service RecHandle: 0x1000d
Service Class ID List:
"OBEX Object Push" (0x1105)
Protocol Descriptor List:
"L2CAP" (0x0100)
"RFCOMM" (0x0003)
Channel: 12
"OBEX" (0x0008)
Profile Descriptor List:
"OBEX Object Push" (0x1105)
Version: 0x0102
Searching for OPUSH on A4:90:CE:DF:64:4F ...
Service Search failed: Invalid argument
You can see that the channel is 12, and then you can push the file to the phone:
linaro@bm1684:~$ obexftp --nopath --noconn --uuid none --bluetooth A4:90:CE:DF:64:4F --channel 12 --put sn.txt
Suppressing FBS.
Connecting..\done
Sending "sn.txt".../done
Disconnecting..-done
At this time, you can see the pop-up window whether to receive the file on the mobile phone.
Use obexctl interactive command line¶
The following demonstrates the steps for EC-A1684JD4 to receive files:
(1) Start the obex service on the device side (slave device):
root@firefly:~# systemctl --user start obex
(2) Enter the interactive command line:
root@firefly:~# obexctl
[NEW] Client /org/bluez/obex
(3) Connect EC-A1684JD4 (master device):
[obex]# connect 20:57:9E:BA:7C:EC
Attempting to connect to 20:57:9E:BA:7C:EC
...
[NEW] Session /org/bluez/obex/client/session2 [default]
[NEW] ObjectPush /org/bluez/obex/client/session2
(4) Send files:
[20:57:9E:BA:7C:EC]# send /root/test.txt
Attempting to send /root/test.txt to /org/bluez/obex/client/session1
[NEW] Transfer /org/bluez/obex/client/session1/transfer1
Transfer /org/bluez/obex/client/session1/transfer1
Status: queued
Name: test.txt
Size: 0
Filename: /root/test.txt
Session: /org/bluez/obex/client/session1
[CHG] Transfer /org/bluez/obex/client/session1/transfer1 Status: complete
(5) Check the test.txt file in the /home/linaro/ directory of EC-A1684JD4:
linaro@bm1684:~$ ls -l test.txt
-rw------- 1 linaro linaro 0 Nov 25 15:49 test.txt