Failed to connect: org.bluez.Error.Failed br-connection-unknown

在执行bluetoothctl connect 时，报如下错误：

Attempting to connect to 24:1A:E6:14:**:AC
hci0 type 1 discovering off
hci0 24:1A:E6:14:**:AC type BR/EDR connected eir_len 25
[CHG] Device 24:1A:E6:14:**:AC Connected: yes
hci0 24:1A:E6:14:**:AC auth failed with status 0x05 (Authentication Failed)
hci0 24:1A:E6:14:**:AC auth failed with status 0x05 (Authentication Failed)
Failed to connect: org.bluez.Error.Failed br-connection-unknown

解决办法：

1. 先remove掉24:1A:E6:14:**:AC 这个蓝牙设备， 命令：

bluetoothctl remove <设备MAC地址> # 清除旧配对

2. 重新配对+连接

bluetoothctl pair <设备MAC地址>    # 重新配对
bluetoothctl trust <设备MAC地址>   # 设为信任设备
bluetoothctl connect <设备MAC地址> # 尝试连接