Qfyilyi

I have an iOS app which acts as a central that connects to an external peripheral via CoreBluetooth.

After I have connected to the peripheral, I read and write data to it and then disconnect. Upon disconnect, I try to establish a connection once again so the next time the peripheral goes into advertise mode, the app will connect to it like so:

func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {

    central.connect(peripheral, options: nil)

    // More actions here...

}

It works great when the app is in the foreground / background, but when terminated, it doesn't work at all.

I have defined the CBCentralManager with the CBCentralManagerOptionRestoreIdentifierKey like so:

self.central = CBCentralManager(delegate: self, queue: nil, options: [CBCentralManagerOptionRestoreIdentifierKey: Application.bluetoothRestoreIdentifier])

I have also implemented the willRestoreState central delegate method:

func centralManager(_ central: CBCentralManager, willRestoreState dict: [String : Any])

What am I doing wrong?

Thanks a lot!

You can save the peripheral's identifier. Then connect to the peripheral depending on the identifier.

Try with below code

func centralManager(_ central: CBCentralManager, willRestoreState dict: [String : Any]) {

        let connectedperipherals = dict[CBCentralManagerRestoredStatePeripheralsKey] as? [CBPeripheral]

        if let peripheral = connectedperipherals?.first {

            central.connect(peripheral, options: nil)

        }

    }