zmq_req_rep_hello_world.rb

require 'ffi-rzmq'

# socket_path = 'tcp://127.0.0.1:5050'
socket_path = 'ipc://zmq_hello_world.ipc'

ctx = ZMQ::Context.create

# Server
thread = Thread.new do
  rep_sock = ctx.socket ZMQ::REP
  rep_sock.bind socket_path

  message = ''
  rep_sock.recv_string message
  puts "REP Received: #{message}"
  rep_sock.send_string 'Goodbye'
  rep_sock.close
end

# Client
req_sock = ctx.socket ZMQ::REQ
req_sock.connect socket_path

req_sock.send_string 'Hello'

reply = ''
req_sock.recv_string reply
puts "REQ Received: #{reply}"
req_sock.close

# Cleanup
thread.join
ctx.terminate