EventMachine over Serial Port

serial-eventmachine.rb

# from http://rubyeventmachine.com/wiki/CodeSnippets
$eventmachine_library = :pure_ruby # need to force pure ruby
  require 'eventmachine'
  gem_original_require 'serialport'
  require 'smsrelay/gsmpdu'

  module EventMachine
    class EvmaSerialPort < StreamObject
      def self.open(dev, baud, databits, stopbits, parity)
        io = SerialPort.new(dev, baud, databits, stopbits, parity)
        return(EvmaSerialPort.new(io))
      end

      def initialize(io)
        super
      end

      ##
      # Monkeypatched version of EventMachine::StreamObject#eventable_read so
      # that EOFErrors from the SerialPort object (which the ruby-serialport
      # library uses to signal the fact that there is no more data available
      # for reading) do not cause the connection to unbind.
      def eventable_read
        @last_activity = Reactor.instance.current_loop_time
        begin
          if io.respond_to?(:read_nonblock)
            10.times {
              data = io.read_nonblock(4096)
              EventMachine::event_callback uuid, ConnectionData, data
            }
          else
            data = io.sysread(4096)
            EventMachine::event_callback uuid, ConnectionData, data
          end
        rescue Errno::EAGAIN, Errno::EWOULDBLOCK, EOFError
          # no-op
        rescue Errno::ECONNRESET, Errno::ECONNREFUSED
          @close_scheduled = true
          EventMachine::event_callback uuid, ConnectionUnbound, nil
        end

      end

    end

    class << self
      def connect_serial(dev, baud, databits, stopbits, parity)
        EvmaSerialPort.open(dev, baud, databits, stopbits, parity).uuid
      end
    end

    def EventMachine::open_serial(dev, baud, databits, stopbits, parity,
                                  handler=nil)
      klass = if (handler and handler.is_a?(Class))
                handler
              else
                Class.new( Connection ) {handler and include handler}
              end
      s = connect_serial(dev, baud, databits, stopbits, parity)
      c = klass.new s
      @conns[s] = c
      block_given? and yield c
      c
    end

    class Connection
      # This seems to be necessary with EventMachine 0.12.x
      def associate_callback_target(sig)
        return(nil)
      end
    end
  end

Hi, "smsrelay/gsmpdu" is a gem or class file yours? Im trying to run your example but this fails using smsrelay/gsmpdu.
Thxs in advance.