title: send message from AppleWatch to iPhone app using watchOS2
body: <p>I tried to send message to iPhone app from iwatchExtension(on ButtonClick) using <code>WCSession</code> method like</p>
  
  <pre><code>[[WCSession defaultSession] sendMessage:applicationData
                                     replyHandler:^(NSDictionary *reply)
  </code></pre>
  
  <p>But delegate method 
   <code>- (void)session:(WCSession *)session didReceiveMessage:</code> is not getting called.</p>
  
  <p>when I tried same while passing data from iPhone to iWatch, it works properly. All delegate methods get called properly in "Extension Delegate" class.</p>