title: Mongoose how to listen for collection changes
body: <p>I need to build a mongo updater process to dowload mongodb data to local IoT devices (configuration data, etc.)</p>
  
  <p>My goal is to watch for some mongo collections in a fixed interval (1 minute, for example). If I have changed a collection (deletion, insertion or update) I will download the full collection to my device. The collections will have no more than a few hundred simple records, so it´s gonna not be a lot of data to download.</p>
  
  <p>Is there any mechanism to find out a collection has changed since last pool ? What mongo features should be used in that case ?</p>