Remote App that does socket.write(cmd) does not get socket.recvfrom(16) 'til after printing completes!

EM Clairvoyant Delay

class Feeder < EventMachine::Connection 
  def initialize(q) 
    @q   = q 
  end 

  # Only the first and last lines will stay after this is debugged
  # How can the send_data() or the remote's recvfrom() not complete
  # until after the channel.push() subscriber gets done, 30 minutes from now?
  def receive_data(cmd) 
    send_data  cmd + '.'@(16 - cmd.size)  # ack to the web app, padded to fill recvfrom(16)
    close_connection_after_writing        # make sure the web app's read() can't hang 
    sleep 10                              # no good reason 
    @q.push  cmd 
  end 
end 

... 

EventMachine::run { 
  q = EM::Channel.new 
  EM::start_server '127.0.0.1', 8814, Feeder, q 
  printer = q.subscribe{|msg|  printer1.print(msg)} 
}