title: how can I send custom message from my in app-browser to my ionic app
body: <p>I am trying to send a custom payload from my js inside my inAppBrowser to my ionic app. I already know how to send data to the inAppbrowser using: </p>
  
  <pre><code>iab.executeScript({code:`alert(2)`});
  </code></pre>
  
  <p>but sending data back is not properly documented, on the github site I saw:</p>
  
  <pre><code>inAppBrowserRef.addEventListener('message', messageCallBack);
  </code></pre>
  
  <p>the above only shows how to make your ionic receive it, but does not show how the javascript is sending it. Please I need help on how to make the inAppbrowser send this custom message.</p>