在bluez 5上使用固定PIN进行蓝牙配对

3 回答

• -1

  几天后摆弄BlueZ 5，这就是我所拥有的 . 使用BlueZ 5.50 和Raspbian Stretch（Pi Zero W）：

  用 --compat 开始bluetoothd：

  附加到/etc/systemd/system/dbus-org.bluez.service中的ExecStart行

  要么

  在rc.local中：sudo bluetoothd --compat＆

  ---

  接下来的步骤由下面发布的代码处理，但为了澄清，hciconfig需要设置为：

  sudo hciconfig hci0 sspmode 0

  Note #1: 使用'sspmode 1 '从Android配对时，您会收到PIN提示，但之后Pi会自动生成6位密码和配对错误 .

  Note #2: hciconfig hci0 无法设置 auth 或 encrypt 那些实际上会注册 agent DisplayOnly （我们将在下一步创建代理）作为 KeyboardDisplay （sudo btmon验证）和配对赢得't use predefined PIN. Not sure if there is a reason why DisplayOnly can' t使用auth，加密（可能与某些事情有关）他们设置安全模式3） .

  之后我们将使用 bluetoothctl ：

  pi@raspberrypi:~ $ bluetoothctl
  Agent registered
  [bluetooth]# agent off
  Agent unregistered
  [bluetooth]# agent DisplayOnly
  Agent registered
  [bluetooth]# default-agent
  Default agent request successful
  [bluetooth]# discoverable on
  Changing discoverable on succeeded
  [CHG] Controller 11:22:33:44:55:66 Discoverable: yes
  [bluetooth]# pairable on
  Changing pairable on succeeded
  [CHG] Controller 11:22:33:44:55:66 Pairable: yes
  
  // Initiate pairing on remote device //
  
  [NEW] Device AA:BB:CC:DD:EE:FF Android_phone
  
  // Enter any PIN on Device AA:BB:CC:DD:EE:FF
  
  Request PIN code
  
  // retype your PIN below (on Pi)
  [agent] Enter PIN code: <your PIN> 
  [CHG] Device AA:BB:CC:DD:EE:FF Class: 0x005a020c
  ...
  [CHG] Device AA:BB:CC:DD:EE:FF Paired: yes
  [bluetooth]# quit
  

  Note #3: 使用pexpect注册代理（如果你尝试运行下面发布的代码只是一个注释），使用BlueZ 5.43（Stretch中的默认版本）就会命中并错过

  ---

  下面是一个Python 2.7代码，它设置sspmode并处理与预生成的PIN的配对：

  #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from __future__ import print_function   # import print from python3: end=""
  import time   
  import re
  import pexpect    # sudo apt-get install python-pexpect
  import subprocess
  import random
  # !!! make sure bluetoothd runs in --compat mode before executing this script !!!
  def pair_with_pin(start_time, pin, time_limit=60):  # int(time.time()), pin - \d{4}, time_limit - approximate pairing window time in seconds, it might take up to 2x (nested timeout conditions)
      "exectutes pairing with entered PIN on bluetooth adapter side"
      pairing_status = False
      try:
          subprocess.call(['sudo','hciconfig','hci0','sspmode', '0'])
          
          # bluetoothctl 
          child = pexpect.spawn('bluetoothctl')
          child.expect("#")
          child.sendline('agent off') # might be unnecessary
          child.expect("unregistered")
          
          child.sendline('agent DisplayOnly')
          child.expect("Agent registered")
          child.sendline('pairable on')
          child.expect("pairable on succeeded")
          child.sendline('discoverable on')
          child.expect("discoverable on succeeded")
          child.sendline('default-agent')
          print ('Please input PIN: ' + pin)              
          
          # waiting for Phone to send a pairing request... 
          child.expect('Enter PIN code:', timeout = time_limit )   # timeout <= PAIRING_TIME_LIMIT to keep some kind of logic
          while int(time.time()) < start_time + time_limit:   # allow multiple pairing attempts during pairing window            
              child.sendline(pin)
              i = child.expect(['Paired: yes', 'Enter PIN code:'], timeout = time_limit)
              if i == 0: # found 'Paired: yes' == successful pairing
                  trust_mac = 'trust ' + re.search(r'(?:[0-9a-fA-F]:?){12}.+$', child.before).group(0)    # extract MAC from last line, one with 'Paired: Yes'
                  child.sendline(trust_mac)   # optionally add device to trusted
                  child.expect('trust succeeded', timeout = 10)                
                  pairing_status = True
                  break
              #else: # i == 1
                  # print('wrong PIN, retrying if time will allow') 
      except pexpect.EOF:
          print ('!!!!!!!! EOF')
      except pexpect.TIMEOUT:
          print ('!!!!!!!! TIMEOUT')
          
      # hide Pi's bluetooth for security reasons
      child.sendline('pairable off')
      child.expect("pairable off succeeded")
      child.sendline('discoverable off')
      child.expect("discoverable off succeeded")    
      child.close()
      
      return pairing_status
  
  #main program body
  PAIRING_TIME_LIMIT = 60
  BT_PIN = random.randint(1000,10000)    # generate random 4-digit PIN 1000..9999
  
  status = pair_with_pin(int(time.time()), str(BT_PIN), PAIRING_TIME_LIMIT)
  if status == True:
      print('Pairing successful')
  

  Final note: 成功配对后， might 可能会启用加密功能，请尝试：

  hciconfig hci0加密

  要么

  hcitool enc $ BDADD

  回复于 2024-04-25T17:25:33+08:00
• 1

  我能够使用测试脚本 .

  如果您有兴趣了解详细信息，请参阅我在Raspberry Pi论坛上的帖子 . 以下是链接 .

  https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=195090&p=1221455#p1221455

  回复于 2024-04-25T17:25:33+08:00
• 0

  首先你需要配置sspmode 0，用于引脚请求：hciconfig hci0 sspmode 0

  并使用bt-agent aplicattion（你也可以作为deamon运行）：

  bt-agent -c NoInputNoOutput -p /root/bluethooth.cfg

  编辑文件配置，你可以把tha mac地址和pin：例如：XX：XX：XX：XX：XX：XX 1234

  或者，如果您希望所有设备的引脚都使用相同的引脚代码（例如1234），请按以下方式编辑文件：* 1234

  这项工作对我来说！

  回复于 2024-04-25T17:25:33+08:00