ZeroMQ Example

client.rb

require 'ffi-rzmq'

context = ZMQ::Context.new(1)

# Socket to talk to server
puts "Connecting to hello world server..."
requester = context.socket(ZMQ::REQ)
requester.connect("tcp://127.0.0.1:5555")

0.upto(9) do |request_nbr|
  puts "Sending request #{request_nbr}..."
  requester.send_string "Hello"

  reply = requester.recv_string ''
  puts "Received reply #{request_nbr}: [#{reply}]"
end

Gemfile

source :rubygems

gem "ffi"
gem "ffi-rzmq"

server.rb

require 'ffi-rzmq'

context = ZMQ::Context.new(1)

# Socket to talk to server
puts "Connecting to hello world server..."
responder = context.socket(ZMQ::REP)
responder.connect("tcp://*:5555")
puts "Connected"

loop do
  request = responder.recv_string ''
  
  sleep 1
  
  responder.send_string "World"
end

A server always binds, so instead of responder.connect it's responder.bind! Wohoo! :)