b836f2ae_ebAPI_SimplePush___MozillaWiki__Explanation
[Return Code] 200 [Explanation] 
Notification has been accepted and passed on to client (via either direct connection or Proprietary Ping mechanism). This does not guarantee that the notification has been successfully delivered to the app, but does reflect a higher percentage chance of it happening.)
WebAPI/SimplePush - MozillaWiki
Explanation