如果您的Bluetooth BLE设备无法连接，请参考以下代码示例：

首先，您需要重置Central Manager：

centralManager = CBCentralManager(delegate: self, queue: nil, options: [CBCentralManagerOptionRestoreIdentifierKey: "centralManagerIdentifier"])
    
if centralManager.state == .poweredOn {
    centralManager.stopScan()
    centralManager.scanForPeripherals(withServices: [serviceUUID], options: [CBCentralManagerScanOptionAllowDuplicatesKey: true])
} else {
    print("Bluetooth is not available.")
}

接下来，您需要实现CBCentralManagerDelegate协议中的以下几个方法：

func centralManagerDidUpdateState(_ central: CBCentralManager) {
    switch central.state {
    case .unknown:
        print("Central state is unknown")
    case .resetting:
        print("Central state is resetting")
    case .unsupported:
        print("Central state is unsupported")
    case .unauthorized:
        print("Central state is unauthorized")
    case .poweredOff:
        print("Central state is powered off")
    case .poweredOn:
        print("Central state is powered on")
        centralManager.stopScan()
        centralManager.scanForPeripherals(withServices: [serviceUUID], options: [CBCentralManagerScanOptionAllowDuplicatesKey: true])
    }
}

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    //连接操作
}

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
    //连接成功后的操作
}

func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
    //连接失败后的操作
}

func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
    //连接断开后的操作
}

在上述方法中，您需要实现'连接操作”中初始化/发现服务、特征和描述符，并连接到设备。如果连接成功，didConnectPeripheral将被调用并执行连接后的操作。如果连接失败，didFailToConnect将被调用并执行连接失败后的操作。如果连接断开，didDisconnectPeripheral将被调用并执行连接断开后的操作。

请注意在连接设备时需在info.plist文件中添加'Privacy - Bluetooth Peripheral Usage Description”权限。

希望这些代码示例可以帮助您解决Bluetooth BLE无法连接的问题。