title: Can ZMQ publish message to specific client by pub-sub socket?
body: <p>I am using pub/Sub Socket and currently the server subscribe byte[0] (all topics)
  while client subscribe byte[16] - a specific header as topic</p>
  
  <p>However, I cannot stop client to subscribe byte[0] which can receive all other messages.</p>
  
  <p>My application is a like a app game which has one single server using ZMQ as connection
  and many clients have a ZMQ sockets to talk with server.</p>
  
  <p>What pattern or socket I should use in this case?</p>
  
  <p>Thanks</p>