First off, I know this question has been asked a lot on SO. And I went through all of them trying to resolve it but to no avail.
I have a simple app that scans for Bluetooth enabled devices. Here's my code.
import CoreBluetooth
import UIKit
class ViewController: UIViewController, CBCentralManagerDelegate, CBPeripheralDelegate { var manager: CBCentralManager! var peripheral: CBPeripheral! override func viewDidLoad() { super.viewDidLoad() manager = CBCentralManager(delegate: self, queue: nil) } // MARK: - CBCentralManagerDelegate func centralManagerDidUpdateState(central: CBCentralManager) { print(#function) switch central.state { case .Unsupported: print("Unsupported") case .Unauthorized: print("Unauthorized") case .PoweredOn: print("Powered On") central.scanForPeripheralsWithServices(nil, options: nil) case .Resetting: print("Resetting") case .PoweredOff: print("Powered Off") case .Unknown: print("Unknown") } } func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) { print(#function) print("Discovered (peripheral.name) at (RSSI)") if peripheral.name!.containsString(name) { manager.stopScan() self.peripheral = peripheral self.peripheral.delegate = self manager.connectPeripheral(peripheral, options: nil) } } func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) { print(#function) } func centralManager(central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: NSError?) { central.scanForPeripheralsWithServices(nil, options: nil) } // MARK: - CBPeripheralDelegate func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) { print(#function) guard let services = peripheral.services else { retu } for service in services { print(service.UUID) if service.UUID == serviceUUID { peripheral.discoverCharacteristics(nil, forService: service) } } } func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) { print(#function) guard let characteristics = service.characteristics else { retu } for characteristic in characteristics { print(characteristic.UUID) if characteristic.UUID == scratchUUID { peripheral.setNotifyValue(true, forCharacteristic: characteristic) } } } func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) { print(#function) var count: UInt32 = 0 if characteristic.UUID == scratchUUID { characteristic.value!.getBytes(&count, length: sizeof(UInt32)) print(String(format: "%llu", count)) } }
}I ran it in my iPhone 5 (iOS 9.3.4). I had a laptop running Windows, an Android phone, an iPad Air 2 and my Mac all Bluetooth tued on. But none of those devices were discovered. centralManagerDidUpdateState method gets called and scanning starts but that's it. didDiscoverPeripheral delegate method never gets called.
I repeated the process, this time ran it in the iPad Air 2 but same result.
If I go to the Bluetooth menu on the device I do see other devices being discovered.
In some SO answers, I saw that running it in the main queue would work. Like so, manager = CBCentralManager(delegate: self, queue: dispatch_get_main_queue()). But that did not work for me either.
I'd really appreciate any help on this.