2018-05-10 14:21:52.200727+0800 BLEMiblueTooth[904:423908] [CoreBluetooth] API MISUSE: Cancelling connection for unused peripheral <CBPeripheral: 0x1cc107ce0, identifier = 441B81EC-A76F-D8EA-324C-6FDB30537, name = (null), state = connecting>, Did you forget to keep a reference to it?
2018-05-10 14:21:52.200727+0800 BLEMiblueTooth[904:423908] [CoreBluetooth] API MISUSE: Cancelling connection for unused peripheral <CBPeripheral: 0x1cc107ce0, identifier = 441B81EC-A76F-D8EA-324C-6FDB30537, name = (null), state = connecting>, Did you forget to keep a reference to it?