CoreBluetooth XPC connection invalid

Question

public class BLE: NSObject, CBCentralManagerDelegate {

    var centralManager:CBCentralManager!

    public override init() {
        super.init()
        self.centralManager = CBCentralManager.init(delegate: self, queue: nil)
    }

    public func centralManagerDidUpdateState(_ central: CBCentralManager) {

        switch central.state {
        case .unknown:
            print("unknown")
        case .resetting:
            print("resetting")
        case .unsupported:
            print("unsupported")
        case .unauthorized:
            print("unauthorized")
        case .poweredOff:
            print("powered off")
        case .poweredOn:
            print("powered on")
            self.centralManager.scanForPeripherals(withServices: nil, options: nil)
        }
    }
}

This is my code, whenever I run it, it gives me the message

“[CoreBlueooth] XPC Connection Invalid”

I did try adding NSBluetoothPeripheralUsageDescription into my info.plist file but that didn’t work.

The weird part though is that, if I initialize CBCentralManager directly instead of using a class then everything works fine.

This problem only arises when I try to initialize CBCentralManager by creating on object of the class BLE or any other class for that matter.

Have you check this url. https://stackoverflow.com/questions/43880346/corebluetooth-xpc-connection-invalid-on-dismiss-viewcontroller — aBilal17, Apr 19 '18 at 09:44
you have to add some key in your info.plist will resolve this issue — aBilal17, Apr 19 '18 at 09:44
Try defining CBCentralManager in your appDelegate, use same CBCentralManager in your BLE class — aBilal17, Apr 19 '18 at 09:46
I already came across that url before I asked my question which is why I tried editing my info.plist in the first place. Perhaps you could be more specific as to which keys I should add? — Zeryx, Apr 19 '18 at 09:55
I’ve also tried defining CBCentralManager in my appDelegate, no luck unfortunately — Zeryx, Apr 19 '18 at 09:55

Belzik · Answer 1 · 2018-12-07T11:45:30.360

CBCentralManager reference should be a strong reference to the class as a member variable. It cannot work as a local reference.

Try next:

class ViewController: UIViewController {
   var ble: BLE!
   override func viewDidLoad() {
      super.viewDidLoad()

      ble = BLE()
  }
}

class BLE: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate {
   private var manager: CBCentralManager!

   required override init() {
      super.init()
      manager = CBCentralManager.init(delegate: self, queue: nil)
   }

   func centralManagerDidUpdateState(_ central: CBCentralManager) {
      var consoleLog = ""

      switch central.state {
      case .poweredOff:
          consoleLog = "BLE is powered off"
      case .poweredOn:
          consoleLog = "BLE is poweredOn"
      case .resetting:
          consoleLog = "BLE is resetting"
      case .unauthorized:
          consoleLog = "BLE is unauthorized"
      case .unknown:
          consoleLog = "BLE is unknown"
      case .unsupported:
          consoleLog = "BLE is unsupported"
      default:
          consoleLog = "default"
      }
      print(consoleLog)
   }
}

score 10 · Answer 2 · answered Aug 29 '18 at 17:58

10

I ran into the same issue: sandboxing is "On" by default and disables access to Bluetooth.

Make sure your target capabilities allow Bluetooth HW access (see attached screenshot).

answered Aug 29 '18 at 17:58

zenerino

156
1
5

I didn't see that app sandbox section either – Anonymous-E Jul 28 '19 at 10:48
Look at Background Modes – LAD Aug 02 '19 at 12:57
2

This is no longer valid in XCode. – Hashim Akhtar Aug 29 '19 at 16:57
1

Thanks! Worked for me in Xcode 11 - it's under "Signing & Capabilities" now – Ashald Oct 29 '19 at 20:29

Fromarch · Answer 3 · 2019-08-07T08:27:34.763

7

For people who are running an iOS simulator, bluetooth does not work within it. Thus, if you try and simulate an app using bluetooth, it will raise the "[CoreBlueooth] XPC Connection Invalid" error.

For further information : https://www.browserstack.com/test-on-ios-simulator

You need to test your app on a real device.

edited Aug 07 '19 at 08:27

answered Aug 05 '19 at 10:51

Fromarch

71
1
2

score 0 · Answer 4 · answered Aug 29 '19 at 19:03

In my case it turns out that I was making a call for Scan too soon. I was making the call from the ViewDidLoad method. The scan would work fine if I initiated it via the press of a button.

The work around I used was to use the performSelector with a delay when calling the scan from the ViewDidLoad method.

score 0 · Answer 5 · answered Nov 26 '19 at 14:52

0

I solved changing NSObject to UIViewController in my manager class

answered Nov 26 '19 at 14:52

Álvaro Agüero

2,458
32
26

CoreBluetooth XPC connection invalid

5 Answers5

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