前几天试着写了一个解决自己蓝牙音箱连接问题的shell脚本，但是实际运行的时候还是有问题。今天重新整理了一下脚本。

主要问题

主要问题就是，当脚本发现蓝牙音箱且连接异常，重新扫描蓝牙音箱后，不能直接去连接，还要进行一次判断是否扫描到蓝牙音箱，连接后在判断是否连接成功。 问题代码片段如下：

               …………
	      if ! Bluetooths info 
	        then 
	          echo "蓝牙音箱I7连接异常"
		  echo -e "\n……正在移除问题设备: 蓝牙音箱i7……\n"
                  Bluetooths remove "$deviceID"
		  sleep 5s
		  echo -e "\n"'重新扫描蓝牙设备'"\n"
		  Bluetooths --timeout 15 scan on
		  echo -e "\n……正在重新配对和连接蓝牙音箱i7……\n"
		  Bluetooths pair "$deviceID"
		  Bluetooths trust "$deviceID"
		  Bluetooths connect "$deviceID"
		  echo -e "\n正在重新检查蓝牙音箱i7连接状态\n"
		  i7.Connect.Status
		  break
	        else
		  if  [[ $(Bluetooths info | grep -i "UUID: Advanced Audio Distribu") != "" ]]
		    then
		      echo "蓝牙音箱I7虽然连接成功但似乎工作异常"
		      echo -e "\n……正在移除问题设备: 蓝牙音箱i7……\n"
		      Bluetooths remove "$deviceID"
		      sleep 5s
		      echo -e "\n"'重新扫描蓝牙设备'"\n"
		      Bluetooths --timeout 15 scan on
		      echo -e "\n……正在重新配对和连接蓝牙音箱i7……\n"
		      Bluetooths pair "$deviceID"
		      Bluetooths trust "$deviceID"
		      Bluetooths connect "$deviceID"
		      echo -e "\n正在重新检查蓝牙音箱i7连接状态\n"
		      i7.Connect.Status
		      break
                   …………

问题解决

重新整理后的脚本如下：

#!/bin/bash
I7_ID='00:58:56:6A:C8:2D'
I7_Name='Device: i7  '
IFS=$'\n'
count=0 #记录重试次数
flag=0  #重试标记，flag=0 表示任务正常 flag=1 任务失败需要重试 flag=2 未找到相关设备

Connect() {
  Bluetooths() {
    $(type -P bluetoothctl) "$@"
  }

  #连接蓝牙音箱i7
  i7.Connect() {
    Bluetooths pair "$@"
    Bluetooths trust "$@"
    Bluetooths connect "$@"
  }

  # 重新检查蓝牙是否连接成功,当"bluetootctl info"执行失败且"bluetoothctl info | grep -i "UUID: Advanced Audio Distribu"返回为空值时，定义为任务失败需要重试
  i7.Connect.Status() { 
    if [[ $(Bluetooths info | grep -i "UUID: Advanced Audio Distribu") == "" ]] && ! Bluetooths info 
      then
        flag=1
      else
        flag=0
    fi	
  }
  
#重新扫描蓝牙设备，如果发蓝牙音箱再连接
  local deviceInfo
  local key
  local deviceName
  local deviceID

  i7.Scan() {
    local i7Info=$(Bluetooths devices)
    for N in $i7Info
      do
        local keyN=$(echo $N | awk '{print $1": "$3" "$4" "$5}')
	local NameN="$keyN"
	if [ "$NameN" == "$I7_Name" ]
          then
	    local deviceIdN=$(echo $i | awk '{print $2}')
            echo -e "\n发现蓝牙音箱$I7_Name现在开始连接\n"
            i7.Connect "${deviceIdN}"
	    echo -e "\n正在重新检查蓝牙音箱i7连接状态\n"
	    i7.Connect.Status
            break
	  else 
	    flag=2
	fi

      done 
  }

#遍历当前设备是否有蓝牙音箱I7
  while true
    do
      deviceInfo=$(Bluetooths devices)
      for i in $deviceInfo
        do
          key=$(echo $i | awk '{print $1": "$3" "$4" "$5}')
          deviceName="$key"
          if [ "$deviceName" == "$I7_Name" ]
            then
	      deviceID=$(echo $i | awk '{print $2}')
              echo -e "\n"'发现蓝牙音箱: '$I7_Name
	      echo -e "\n"'=================================='
	      echo '==  正在检查蓝牙音箱i7连接状态  =='
	      echo -e '=================================='"\n"
	      if ! Bluetooths info 
	        then 
	          echo -e "\n蓝牙音箱I7连接异常\n"
                  echo -e "\n……正在移除问题设备: 蓝牙音箱i7……\n"
      	          Bluetooths remove "$deviceID"
           	  sleep 3s
           	  echo -e "\n"'重新扫描蓝牙设备'"\n"
                  Bluetooths --timeout 15 scan on
		  i7.Scan		  
		  break
	        else
		  if  [[ $(Bluetooths info | grep -i "UUID: Advanced Audio Distribu") != "" ]]
		    then
		      echo "蓝牙音箱I7虽然连接成功但似乎工作异常"
                      echo -e "\n蓝牙音箱I7连接异常\n"
                      echo -e "\n……正在移除问题设备: 蓝牙音箱i7……\n"
                      Bluetooths remove "$deviceID"
                      sleep 3s
                      echo -e "\n"'重新扫描蓝牙设备'"\n"
                      Bluetooths --timeout 15 scan on
		      i7.Scan
		      break
	            else
		      flag=0
	              break 
		  fi
	      fi
          else 
	    flag=2
        fi
      done
      if [ ${flag} -eq 0 ]
        then
	  echo -e "\n蓝牙音箱i7已成功连接\n"
	  exit 
      elif [ ${flag} -eq 2 ]
        then
	  echo -e "\n未找到蓝牙音箱i7,正在重试\n"
      else
        echo -e "\n蓝牙音箱i7连接失败,正在重试\n"
      fi
      count=$[ ${count} + 1 ]
      if [ $count -ge 6 ]
        then
          echo -e "\n未找到蓝牙音箱i7,退出脚本\n"
	  exit 
      fi
      echo "========================================"
      echo "==     开始第$count次重新连接蓝牙音箱i7    =="
      echo "==             ……请稍等……             =="
      echo -e "========================================\n"
      echo -e "======  3秒后重新连接蓝牙音箱i7   ======\n"
      sleep 3s
      Bluetooths --timeout 15 scan on	
  done
}

Connect

https://music.163.com/#/song?id=5044239