使用蓝牙API无法扫描到周边蓝牙设备，请问那里弄错了，或者漏了吗？ 操作步骤如下

1. wx.openBluetoothAdapter

返回 {openBluetoothAdapter:ok}

2. wx.getBluetoothAdapterState

返回 {

            available: true,

           discovering: false,

            getBluetoothAdapterState: ok

       }

3. wx.startBluetoothDevicesDiscovery

返回 {

            available: true,

isDiscovering: true,

            startBluetoothDevicesDiscovery: ok

}

4.  wx.onBluetoothAdapterStateChange

返回 {

            available: true,

discovering: true

}

5. wx.getBluetoothDevices

返回 {

            getBluetoothDevices: ok,

            devices: []

}

6. wx.getBluetoothAdapterState

返回 {

            available: true,

discovering: false,

            getBluetoothAdapterState: ok

}