【BLE】藍牙BLE 後臺自動重連

關於ios BLE在後臺自動重連的問題 

找到一個國外網站是這麼描述的

Re: How to make the BTLE APP to auto connect with BTLE device when iPhone4S power on ^{沿途見識[2]}

When backgrounding, you can still scan and connect to a LE peripheral.  You can scan for peripherals using scanForPeripheralsWithSerives by stating what service you are looking for in a Peripheral.  You cannot do a general scan without stating at least one service in the passed dictionary.  If you have a CFUUIDRef from a previous connection, you can call retrievePeripherals with the CFUUIDRef.  Your delegate will receive a call to didRetrievePeripherals with a CBPeripheral.  With the CBPeripheral you can then connect using connectPeripheral.