蓝牙 EC-A1684XJD4 支持无线蓝牙，可以通过 "hciconfig -a" 命令显示蓝牙设备信 息： 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) 注意的是，如果打印如下错误信息： Can't open HCI socket.: Address family not supported by protocol 则可能是可加载模块的依赖性出现问题，此时重新加载依赖性，并软重启即可： sudo -i depmod -a reboot 查看当前是主设备还是从设备： 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 # 从设备 启动 PulseAudio 服务作为用于媒体设备： linaro@bm1684:~$ pulseaudio --start --log-target=syslog 连接蓝牙设备步骤如下: （1）启动蓝牙管理工具： linaro@bm1684:~$ bluetoothctl [NEW] Controller 20:57:9E:BA:7C:EC bm1684 [default] （2）上电蓝牙控制器： [bluetooth]# power on Changing power on succeeded （3）将蓝牙代理设置为默认值： [bluetooth]# agent on Agent registered [bluetooth]# default-agent Default agent request successful （4）打开可被其他蓝牙设备发现： [bluetooth]# discoverable on Changing discoverable on succeeded [CHG] Controller 20:57:9E:BA:7C:EC Discoverable: yes （5）此时在智能手机就能发现 EC-A1684XJD4 蓝牙设备，手机点击后就能配对 上去： [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）连接手机设备： [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）把手机设备设置成信任： [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 蓝牙音频 更新源 往 "/etc/apt/sources.list" 添加新的源： deb-src https://mirrors.huaweicloud.com/ubuntu-ports/ bionic main restricted universe multiverse deb-src https://mirrors.huaweicloud.com/ubuntu-ports/ bionic-updates main restricted universe multiverse deb-src https://mirrors.huaweicloud.com/ubuntu-ports/ bionic-backports main restricted universe multiverse deb-src https://mirrors.huaweicloud.com/ubuntu-ports/ bionic-security main restricted universe multiverse 更新源： apt-get update 安装 sbc 1.5-3 # clone and checkout git clone https://salsa.debian.org/bluetooth-team/sbc.git cd sbc git checkout debian/1.5-3 # downgrade debhelper-compat sed -i -e 's/debhelper-compat (= 13)/debhelper-compat (= 12)/g' debian/control # install build dependency sudo apt-get build-dep sbc # build deb dpkg-buildpackage -b -us -uc # install deb cd .. sudo apt-get install ./*sbc*_1.5-3_*.deb 安装 fdk-aac 2.0.2 # clone and checkout git clone https://salsa.debian.org/multimedia-team/fdk-aac cd fdk-aac git checkout debian/2.0.2-1 # downgrade debhelper-compat sed -i -e 's/debhelper-compat (= 13)/debhelper-compat (= 12)/g' debian/control # install build dependency sudo apt-get build-dep libfdk-aac-dev # build deb dpkg-buildpackage -b -us -uc # install deb cd .. sudo apt-get install ./*libfdk-aac-dev*.deb 安装最新版本的 bluez-alsa # clone and checkout # 笔者测试的时候，该仓库的 HEAD 是：f0f9427da7d747cfe48b5c83b3076841f48d8703 git clone https://github.com/arkq/bluez-alsa cd bluez-alsa # install build dependency sudo apt-get install automake build-essential libtool pkg-config python3-docutils sudo apt-get install libasound2-dev libbluetooth-dev libdbus-1-dev libglib2.0-dev libsbc-dev libspandsp-dev # build and install autoreconf --install --force mkdir build cd build ../configure --enable-aac --enable-msbc --enable-systemd make -j4 sudo make install # update systemd service sudo sed -i -e 's,^ExecStart=.*$,ExecStart=/usr/bin/bluealsad -S -p a2dp-source -p a2dp-sink -p hfp-ag -p hsp-ag,g' /lib/systemd/system/bluealsa.service # disable pulseaudio, MUST BE RUN AS USER 'linaro' systemctl --user disable --now pulseaudio pulseaudio.socket sudo systemctl daemon-reload sudo systemctl restart bluealsa 音频测试 打开第一个终端: 使用 bluetoothctl 连接蓝牙耳机 bluetoothctl Agent registered [bluetooth]# scan on # ^- turn on scan, lots of result follow ... [bluetooth]# scan off # find the handset mac shown above # and do the pairing (replace the MAC with actual device MAC) [bluetooth]# pair MAC [bluetooth]# trust MAC [bluetooth]# connect MAC # show the device info, for example: [DEV]# info info Device 38:F5:FA:A2:70:A0 (public) Name: W25 Alias: W25 Class: 0x00240404 Icon: audio-card Paired: yes Trusted: yes Blocked: no Connected: yes LegacyPairing: no UUID: Audio Sink (0000110b-0000-1000-8000-00805f9b34fb) UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb) UUID: A/V Remote Control (0000110e-0000-1000-8000-00805f9b34fb) UUID: Handsfree (0000111e-0000-1000-8000-00805f9b34fb) UUID: PnP Information (00001200-0000-1000-8000-00805f9b34fb) Modalias: bluetooth:v05D6p000Ad0240 ManufacturerData Key: 0x7262 ManufacturerData Value: 32 32 78 78 11 22 33 44 55 66 aa bb 00 00 22xx."3DUf.... 打开第二个终端: 播放和录音 # List the available BT audio PCMs: $ sudo bluealsa-aplay -L bluealsa:DEV=38:F5:FA:A2:70:A0,PROFILE=sco,SRV=org.bluealsa W25, trusted audio-card, capture SCO (mSBC): S16_LE 1 channel 16000 Hz bluealsa:DEV=38:F5:FA:A2:70:A0,PROFILE=sco,SRV=org.bluealsa W25, trusted audio-card, playback SCO (mSBC): S16_LE 1 channel 16000 Hz bluealsa:DEV=38:F5:FA:A2:70:A0,PROFILE=a2dp,SRV=org.bluealsa W25, trusted audio-card, playback A2DP (SBC): S16_LE 2 channels 48000 Hz 播放: sudo aplay -D bluealsa:DEV=38:F5:FA:A2:70:A0,PROFILE=a2dp,SRV=org.bluealsa /usr/share/sounds/alsa/Front_Center.wav 录制: # -d 6: record 6 seconds sudo arecord -f S16_LE -r 16000 -D bluealsa:DEV=38:F5:FA:A2:70:A0,PROFILE=sco,SRV=org.bluealsa -d 6 /tmp/a.wav 音量控制: $ sudo bluealsactl list-pcms /org/bluealsa/hci0/dev_38_F5_FA_A2_70_A0/a2dpsrc/sink /org/bluealsa/hci0/dev_38_F5_FA_A2_70_A0/hfpag/sink /org/bluealsa/hci0/dev_38_F5_FA_A2_70_A0/hfpag/source # Get Volume $ sudo bluealsactl volume /org/bluealsa/hci0/dev_38_F5_FA_A2_70_A0/a2dpsrc/sink Volume: 127 127 # Set Volume $ sudo bluealsactl volume /org/bluealsa/hci0/dev_38_F5_FA_A2_70_A0/a2dpsrc/sink 100 文件收发 蓝牙文件收发可以使用 OBEX 协议，它以对象模型封装信息数据，以会话协议规 范传输应用。 在 Linux 中需要用到 Obex 服务，首先 EC-A1684XJD4 根据前面的步骤连接好 蓝牙设备，然后开启 Obex 守护进程，并设置接收的目录为 "/home/linaro/"： /usr/lib/bluetooth/obexd -r /home/linaro -a -d & 使用 obex push 服务 首先将蓝牙配置成主设备模式： sudo hciconfig hci0 lm master 查找手机 Obex Push 服务的通道： 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 可以看到通道为 12，紧接着就能把文件 push 到手机上： 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 此时手机端就可看到是否接收文件的弹窗。 使用 obexctl 交互命令行 以下演示 EC-A1684XJD4 收文件的步骤： （1）设备端（从设备）开启 obex 服务： root@firefly:~# systemctl --user start obex （2）进入交互命令行： root@firefly:~# obexctl [NEW] Client /org/bluez/obex （3）连接 EC-A1684XJD4 （主设备）： [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）发送文件： [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）查看 EC-A1684XJD4 的 "/home/linaro/"目录有 "test.txt" 文件： linaro@bm1684:~$ ls -l test.txt -rw------- 1 linaro linaro 0 Nov 25 15:49 test.txt