| Hi Sean Lin,
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.
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