# File lib/pry-remote-em/broker.rb, line 81
      def watch_heartbeats(url)
        return if timers[url]
        timers[url] = EM::PeriodicTimer.new(20) do
          if !hbeats[url] || (Time.new - hbeats[url]) > 20
            servers.delete(url)
            timers[url].cancel
            timers.delete(url)
          end
        end
      end