背景：希望路由器能够支持蓝牙。
资源：openWRT路由器（Kernal:3.10)
      Bluetooth Dongle: CSR4.0

1、make menuconfig打开相关选项
    - Kernel modules
        - Other modules
            - kmod-bluetooth
        - USB Support
            - kmod-usb-core
            - kmod-usb-ohci
            - kmod-usb-storage
            - kmod-usb-usb2
    
    - Ulities
        - bluez-utils
        - blues-hcidump (O)
        - bluelog (O)
        
    - Libraries
        - bluez-libs
        - usb-
        
2、打开上述选项后编译，然后升级路由器软件。
3、将BT dongle连接到路由器,可用lsusb命令辅助查看，当路由器正常识别到适配器后，进行以下步骤。
4、搜索蓝牙设备
```bash
hciconfig hci0 up #打开蓝牙
hciconfig hci0 piscan #蓝牙可见
hciconfig hci0 noscan #蓝牙不可见

hcitool scan #搜索附近的蓝牙设备
```
5、配对一个蓝牙设备
openWRT默认的配置需要先修改后，才能完成配对/连接。
5.1、/etc/bluetooth
   
-1、hcid.conf
# HCI daemon configuration file.
# HCId options
options {
    autoinit yes;
    security auto;
    pairing multi;
    passkey "0000";
    }
    
# Default settings for HCI devices
device {          
    name "%h";
    class 0x000100;
    lm accept,master; 
    lp rswitch,hold,sniff,park;
    }

-2、rfcomm.conf

``bash
# RFCOMM configuration file.
rfcomm0 {
    bind yes;
    device F0:DB:E2:93:40:A3; #需要连接的蓝牙设备
    channel 1;
    comment "gaojing test";
    }
```

5.2、/var/lib/bluetooth/xx:xx:xx:xx:xx:xx
新增pincodes文件，文件内容如下
F0:DB:E2:93:40:A3 0000

5.3 配对/连接 （1代表chennel）
    rfcomm bind /dev/rfcomm0 F0:DB:E2:93:40:A3 1
    rfcomm connect /dev/rfcomm0 1 F0:DB:E2:93:40:A3

3.1 hciconfig
    – Gives info about the bluetooth hci on your pc
    – Ensure the device is up and running and has required scan modes
    – hcitool dev should also give some of this info

3.2 hcitool inq and hcitool scan
    – Gives info about or rather identifies nearby bluetooth devices

3.3 hcitool info <BTAddr>
    – Get info about remote bluetooth device

3.4 l2ping <BTAddr>
    – One way to see if we can communicate with a remote bluetooth device

3.5 sdptool browse <BTAddr> or sdptool records   <BTAddr>
    – Gives info about the services provided by a remote bluetooth device

3.6 obexftp –nopath –noconn –uuid none –bluetooth <BTAddr> –channel <OPUSHChannelNo> –put <FileToPut>
    – Allows one to send file without specifying the pin on the remote device side
    – The OPush channel number for device is got from sdptool above

3.7 passkey-agent –default <Pin>
    – Pin specified here is what the remote BT device should provide or its user enter on that device when requested.

3.8 obexftp -b <BTAddr> -v -p <FileToPut>
    – Allows one to put a file onto the specified BT device
    – obexftp could also be used to get or list the files on the BT device
    – also allows one to identify a nearby BT device by just giving -b option

3.9 obexpushd
    – Allows one to recieve files sent from a bluetooth device.
    – Depending on who started it, the recieved files will be stored in the corresponding home directory
    
3.10 添加通道
    - sdptool add --channel=1 DID SP DUN LAN FAX OPUSH FTP HS HF SAP NAP GN PANU HID CIP CTP A2SRC A2SNK SYNCML NOKID PCSUITE SR1
    后面的参数不一定被支持，但是以防有些服务没有被打开，所以，干脆全部打开了。
    
3.11 rfkill unblock Bluetooth rfkill list
    - Can't init device hci0: Operation not possible due to RF-kill (132)