title: CBPeripheralManager is not powered on
body: <p>I keep getting an error saying my CBPeripheralManager is not powered on but in my code i feel that i carried this out. Here is my code:</p>
  
  <pre><code>- (void)viewDidLoad {
      [super viewDidLoad];
      // Do any additional setup after loading the view, typically from a nib.
  
      // Start up the CBPeripheralManager
      _peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:nil];
      // Start up the CBCentralManager
  
      // And somewhere to store the incoming data
      _data = [[NSMutableData alloc] init];
  }
  
  /** Required protocol method.  A full app should take care of all the possible states,
   *  but we're just waiting for  to know when the CBPeripheralManager is ready
   */
  - (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral {
  
      if (peripheral.state == CBPeripheralManagerStatePoweredOn) {
  
          // We're in CBPeripheralManagerStatePoweredOn state...
          NSLog(@"self.peripheralManager powered on.");
  
          // ... so build our service.
  
          // Then the service
          CBMutableService *transferService = [[CBMutableService alloc] initWithType:[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID] primary:YES];
  
          // And add it to the peripheral manager
          [self.peripheralManager addService:transferService];
      }
  }
  </code></pre>
  
  <p>Then later I call my peripheral to start advertising with an IBAction button:</p>
  
  <pre><code>- (IBAction)advertise:(id)sender {
      [self.peripheralManager startAdvertising:@{ CBAdvertisementDataServiceUUIDsKey : @[[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID]] }];
      [self.peripheralManager startAdvertising:@{ CBAdvertisementDataTxPowerLevelKey : @(YES)}];
  }
  </code></pre>