timer.rb

def start_request
  method = http.post :body => { data: { serial_no: serial } }
    method.errback do 
      yield
      $stderr.puts 'Can\'t connect to cloud'
    end
    
    method.callback do
      yield
      p method.response_header.status
      p method.response_header
      p method.response
    end
  end
end


timer = EventMachine::Timer.new(5) do
  start_request do
    timer = EventMachine::Timer.new(5)
  end
end