XMPP4R Callbacks dont seem to work

Im using xmpp4r and trying to get the hang of a basic chat feature that I wish to implement later in my Rails app. My fundamentals on Ruby Threads is still a bit shaky so I would appreciate any help on this.

Though I register the callback i dont get a response from my gmail account. I am able to send a message but my ruby program terminates. In order to prevent it from terminating I tried to stop on of the threads in the program but I cant seem to get it working.

require 'rubygems'
require "xmpp4r/client"
require "xmpp4r/roster"

include Jabber

def connect
    client = Client.new(JID::new("test@gmail.com"))
    client.connect
    client.auth("test")
    client.send(Presence.new.set_type(:available))
    client
end

def create_message(message, to_email)

    msg = Jabber::Message::new(to_email, message)
    msg.type = :chat
    msg
end

def subscribe(email_id)
    pres = Presence.new.set_type(:subscribe).set_to(email_id)
    pres
end

client = connect

roster = Roster::Helper.new(client)
  roster.add_subscription_request_callback do |item,pres|
    roster.accept_subscription(pres.from)
end


def create_callback(client)
  $t4= Thread.new do
            client.add_message_callback do |m|
                    puts m.body
                    puts "................................Callback working"
            end
    end

end



  puts "Client has connected"
 msg = create_message("Welcome to the winter of my discontent", "test@tech.com")
 client.send(msg)
 create_callback(client)
 def check(client)
      $t3 =  Thread.new do
            loop do

                    puts "t3 still running........."
                    Thread.current.stop
                    $t4.join
                    end
            end
end

check(client)

Instead of the check(client) stuff you can just use Thread.stop like the XMPP4R examples do.

If you'd like to see what's going on at the XMPP level, use Jabber::debug = true to enable console debug output.