title: Query regarding Reported/Desired states of Device Twins@IOTHub
body: <p>I am trying to implement a cloud based solution for Home Automation devices and exploring various options offered by Azure IOT Hub and device twins. Its in this context I need to understand few things :-</p>
  
  <p>1)When a device sends reported properties update to IOTHub, is it mandatory for the back end application to simultaneously update desired properties update back to device of same properties. 
  2)Do the Desired properties/Reported properties always remain to be in sync with each other - update on one(by either side) triggering update of another. so if cloud back end app updates desired properties to device, is it required for the device to update its properties and trigger back reported properties update back to IOTHub with same properties? 
  3)In short can Reported and Desired properties <strong><em>be different at any point of time</em></strong>?</p>
  
  <p>Going through the documentation I understand that reported/desired properties at cloud end(and device end) can be different as these server different purpose. But it would be good if I get clarification on same.</p>
  
  <p>Thanks</p>