title: I can't get WatchConnectivity's session:didRecieveMessage: to be called
body: <p>I've tried to get WatchConnectivity to work, but I can't send (location) messages from my iPhone to my Apple Watch.
  In AppDelegate I set up the session:</p>
  
  <pre><code>var session: WCSession!    
  
  func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -&gt; Bool {
      // Override point for customization after application launch.
      if WCSession.isSupported() {
          session = WCSession.defaultSession()
          session.delegate = self
          session.activateSession()
      }
      return true
  }
  </code></pre>
  
  <p>In my ViewController:  </p>
  
  <pre><code>let manager = CLLocationManager!
  
  override func viewDidLoad() {
      super.viewDidLoad()
      manager.desiredAccuracy = kCLLocationAccuracyBest
      manager.startUpdatingLocation()
      self.manager.delegate = self
      // CLLocationManager status handling code
  }
  
  func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { // I know this is called
      if let locationData = manager.location {
          let location = ["location" : locationData]
          (UIApplication.sharedApplication().delegate as! AppDelegate).session.sendMessage(locationData, replyHandler: nil, errorHandler: nil)
      }
  }
  </code></pre>
  
  <p>Here the relevant Interface Controller code:  </p>
  
  <pre><code>var session: WCSession!
  
  override func willActivate() {
      // This method is called when watch view controller is about to be visible to user
      super.willActivate()
      if WCSession.isSupported() {
          session = WCSession.defaultSession()
          session.delegate = self
          session.activateSession()
      }
  }
  
  
  func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -&gt; Void) { // This method is never called
      let location = message["location"] as? CLLocation
      print(location)
  }
  </code></pre>
  
  <p>However, my InterfaceController does not receive the message, nothing is printed, and the breakpoint I put is not triggered.</p>
  
  <p>Can anyone point me in the right direction? Thanks.</p>