蓝牙 EC-A1688JD4 支持无线蓝牙，可以通过 "hciconfig -a" 命令显示蓝牙设备信息 ： linaro@sophon:~$ hciconfig -a hci0: Type: Primary Bus: USB BD Address: F0:35:75:A7:E2:88 ACL MTU: 1021:6 SCO MTU: 255:12 UP RUNNING PSCAN ISCAN RX bytes:1050 acl:0 sco:0 events:61 errors:0 TX bytes:2735 acl:0 sco:0 commands:61 errors:0 Features: 0xff 0xff 0xff 0xfa 0xdb 0xbf 0x7b 0x87 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 Link policy: RSWITCH HOLD SNIFF PARK Link mode: SLAVE ACCEPT Name: 'sophon' Class: 0x0c0000 Service Classes: Rendering, Capturing Device Class: Miscellaneous, HCI Version: 5.1 (0xa) Revision: 0x1ac7 LMP Version: 5.1 (0xa) Subversion: 0x2999 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@sophon:~$ hciconfig hci0 lm hci0: Type: Primary Bus: USB BD Address: F0:35:75:A7:E2:88 ACL MTU: 1021:6 SCO MTU: 255:12 Link mode: SLAVE ACCEPT # 从设备 启动 PulseAudio 服务作为用于媒体设备： linaro@sophon:~$ 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@sophon:~$ bluetoothctl Agent registered [CHG] Controller F0:35:75:A7:E2:88 Pairable: yes （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 is already 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 F0:35:75:A7:E2:88 Discoverable: yesyes （5）此时在智能手机就能发现 EC-A1688JD4 蓝牙设备，手机点击后就能配对上 去： [NEW] Device 34:1C:F0:40:59:55 小黎的 Redmi K30 Ultr Request confirmation [agent] Confirm passkey 062794 (yes/no): yes [CHG] Device 34:1C:F0:40:59:55 Modalias: bluetooth:v0046p1200d1436 [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001105-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000110a-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000110c-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001112-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001115-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001116-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000111f-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000112f-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001132-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001200-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001800-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001801-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 ServicesResolved: yes [CHG] Device 34:1C:F0:40:59:55 Paired: yes Authorize service [agent] Authorize service 0000110d-0000-1000-8000-00805f9b34fb (yes/no): yes [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001105-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000110a-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000110c-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000110d-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001112-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001115-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001116-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000111f-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 0000112f-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001132-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001200-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001800-0000-1000-8000-00805f9b34fb [CHG] Device 34:1C:F0:40:59:55 UUIDs: 00001801-0000-1000-8000-00805f9b34fb （6）连接手机设备： [bluetooth]# connect 34:1C:F0:40:59:55 Attempting to connect to 34:1C:F0:40:59:55 [CHG] Device 34:1C:F0:40:59:55 Connected: yes （7）把手机设备设置成信任： [小黎的 Redmi K30 Ultr]# trust 34:1C:F0:40:59:55 [CHG] Device 34:1C:F0:40:59:55 Trusted: yes Changing 34:1C:F0:40:59:55 trust succeeded 蓝牙音频 蓝牙音频可以使用 bluez-alsa 工具，这是一个蓝牙音频 ALSA 后端实用程序。 安装 bluez-alsa 工具 EC-A1688JD4 默认没有安装该工具，用户需要自行编译安装，这里演示 1.3.0 版本的步骤，如下： （1）安装依赖： sudo apt-get install git automake build-essential libtool pkg-config python3-docutils sudo apt-get install libasound2-dev libbluetooth-dev libdbus-1-dev libglib2.0-dev libsndfile1-dev libsbc-dev sudo apt-get install libudev-dev libical-dev libreadline-dev # 安装 fdk-aac wget https://downloads.sourceforge.net/opencore-amr/fdk-aac-2.0.1.tar.gz tar -zxvf fdk-aac-2.0.1.tar.gz cd fdk-aac-2.0.1/ autoreconf -fiv sudo ./configure --prefix=/usr --disable-shared sudo make sudo make install （2）下载 "bluez-alsa" 并编译安装： wget https://github.com/arkq/bluez-alsa/archive/refs/tags/v1.3.0.tar.gz tar -xf v1.3.0.tar.gz cd bluez-alsa-1.3.0 autoreconf --install mkdir build && cd build ../configure --enable-aac --enable-debug make && make install 音频测试 安装完成后可以连接蓝牙耳机或者音箱进行音乐播放，首先将蓝牙配置成主设备 模式： sudo hciconfig hci0 lm master 开启 bluez-alsa 服务，注意 PulseAudio 服务与 bluez-alsa 是互斥的： # 去掉 PulseAudio 进程 killall pulseaudio # 开启 bluez-alsa 服务用于连接蓝牙耳机或音响 bluealsa -p a2dp-source -p hsp-ag & 连接蓝牙耳机： [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]# 另外开启一个登录，执行以下命令播放音频： aplay -D bluealsa:HCI=hci0,DEV=0C:AE:BD:9B:BB:5C,PROFILE=a2dp example.wav 关于 bluez-alsa 更多使用可参考源代码仓库： https://github.com/Arkq/bluez-alsa/tree/v1.3.0 。 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-A1688JD4 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@sophon:~$ 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@sophon:~$ 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-A1688JD4 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-A1688JD4 （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-A1688JD4 的 "/home/linaro/"目录有 "test.txt" 文件： linaro@sophon:~$ ls -l test.txt -rw------- 1 linaro linaro 0 Nov 25 15:49 test.txt