Why aren't my Characteristic appearing in BLE advertisement Swift - iphone

Question

I want to advertise some characteristics from an iPhone acting as a peripheral, but although the service seems to contain the characteristics they don't show up when you look at it with a BLE scanner, the service works fine and displays the localNameKey.
thanks
import UIKit
import CoreBluetooth
class ViewController: UIViewController, CBPeripheralManagerDelegate{
var peripheralManager: CBPeripheralManager!
let myCustomServiceUUID: CBUUID = CBUUID(string: "B5893BC9-63AB-42A5-BB33-EEAE686BED1D")
let myCustomCharacteristic: CBUUID = CBUUID(string: "9BA41369-C5B7-456B-B4E3-BB0A8DFF3A95")
let myCustomCharacteristic2: CBUUID = CBUUID(string: "9BA41369-C5B7-456B-B4E3-BB0A8DFF3A85")
var myService: CBMutableService!
var myCharacteristics: CBMutableCharacteristic!
var myCharacteristics2: CBMutableCharacteristic!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
peripheralManager = CBPeripheralManager(delegate: self, queue: nil)
myService = CBMutableService(type: myCustomServiceUUID, primary: true)
myCharacteristics = CBMutableCharacteristic(type: myCustomCharacteristic, properties: CBCharacteristicProperties.Broadcast, value: nil, permissions: CBAttributePermissions.Readable)
myCharacteristics2 = CBMutableCharacteristic(type: myCustomCharacteristic2, properties: CBCharacteristicProperties.Broadcast, value: nil, permissions: CBAttributePermissions.Readable)
myService.characteristics = [myCharacteristics, myCharacteristics2]
peripheralManager.addService(myService)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func peripheralManagerDidUpdateState(peripheral: CBPeripheralManager) {
if peripheral.state == CBPeripheralManagerState.PoweredOn {
let dataTobeAdvetised :[String: AnyObject!] = [CBAdvertisementDataServiceUUIDsKey: [myService.UUID], CBAdvertisementDataLocalNameKey: "MY Device"]
self.peripheralManager.startAdvertising(dataTobeAdvetised)
print(myService)
print("It should be working!........")
} else if peripheral.state == CBPeripheralManagerState.PoweredOff {
self.peripheralManager.stopAdvertising()
}
}
}

Answer 1

You aren't permitted to use CBCharacteristic.broadcast property value.
From the documentation -
CBCharacteristicPropertyBroadcast
The characteristic’s value can be broadcast using a characteristic
configuration descriptor.
This property is not allowed for local characteristics published via
the addService: method of the CBPeripheralManager class. This means
that you cannot use this property when you initialize a new
CBMutableCharacteristic object via the
initWithType:properties:value:permissions: method of the
CBMutableCharacteristic class.
You should use some combination of CBCharacteristicPropertyRead, CBCharacteristicPropertyWriteWithoutResponse and CBCharacteristicPropertyWrite depending on your requirements.

Answer 2

Old question, but hopefully this will help somebody else. I was struggling with the same issue, but for me there was no didAddService callback. Turns out GATT initialisation should be after the peripheral state has changed to PoweredOn.
func peripheralManagerDidUpdateState(peripheral: CBPeripheralManager) {
if peripheral.state == CBPeripheralManagerState.PoweredOn {
//Do initialisation and then start advertising.
}
}