ea-ps_2084-03b/mitm.rb

#!/usr/bin/env ruby
# encoding: utf-8
# ruby: 1.9
require 'serialport'
require './telegram'

pc_serial = SerialPort.open("/dev/ttyUSB0",{ baud: 57600, databits: 8, parity: SerialPort::ODD, stop_bit: 1, flow_control: SerialPort::NONE})
ps_serial = SerialPort.open("/dev/ttyACM0",{ baud: 115200, databits: 8, parity: SerialPort::ODD, stop_bit: 1, flow_control: SerialPort::NONE})

# ensure serial settings (weird bug)
pc_serial.baud = 57600
pc_serial.parity = SerialPort::ODD

while true
  activities = IO.select([pc_serial,ps_serial])
  activities[0].each do |activity|
    data = activity.readpartial(16+1+5)
    line = data.unpack("C*").collect { |b| sprintf("%02X ",b) }.join
    if activity==pc_serial then
      puts "pc->ps: "+line
      begin
        telegram = Telegram.parse(data)
        puts "pc->ps: "+telegram.to_s if telegram
      rescue Exception => e
        puts e.to_s
      end
      ps_serial.write(data)
    elsif activity==ps_serial then
      puts "ps->pc: "+line
      begin
        telegram = Telegram.parse(data)
        puts "ps->pc: "+telegram.to_s if telegram
      rescue Exception => e
        puts e.to_s
      end
      pc_serial.write(data)
    else
      raise "unknown source"
    end
  end
end