title: API request to already opened django channels consumer
body: <p>I've got a django channels consumer communicating with a client. I've got a view from an external API that wants something from the client. From this view I want then to tell that consumer to ask a request to the client through his socket.</p>
  
  <p>I'm currently exploring django rest framework but I can't find a way for now to directly ask anything to that consumer.
  Well I've got an idea but it involves creating another socket and communicate through channels' channel. But I wish I could get rid of this overload.</p>