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 }