train-serial - Train Plugin for connecting to serial interfaces

This plugin allows applications that rely on Train to communicate with devices connected over serial interfaces. This could be the console port of network gear or embedded systems.

Installation

You will have to build this gem yourself to install it as it is not yet on Rubygems.Org. For this there is a rake task which makes this a one-liner:

rake install:local

Transport parameters

Option	Explanation	Default
device	Device to connect to	/dev/ttyUSB0
baud	Baud rate	9600
data_bits	Data Bits for connection	8
parity	Parity (:none, :even, :odd)	:none
stop_bits	Stop Bits for connection	1
buffer_size	Number of bytes per read	1024
buffer_wait	Wait between reads	250
buffer_retries	Retries until stopping reads	3
setup	Commands to issue on open
teardown	Commands to issue on close
raw_output	Suppress stdout processing	false
error_pattern	Regex to match error lines	ERROR.*
prompt_pattern	Regex to match device prompt	[-a-zA-Z0-9]+(?:\((?:config|config-[a-z]+|vlan)\))?[#>]\s*$

Example use

This will work for a Cisco device on /dev/ttyUSB0:

require 'train'
train  = Train.create('serial', {
            device:   '/dev/ttyUSB0',
            setup:    %Q[
              enable
              #{ENV['ENABLE_PASSWORD']}
              terminal pager 0
            ],
            teardown: "disable",
            logger:   Logger.new($stdout, level: :info)
         })
conn   = train.connection
result = conn.run_command("show version\n")
conn.close

Useful Setup/Teardown Patterns

Device	Setup	Teardown
Cisco Catalyst	enable\nterminal length 0\n	disable
Cisco ASA	enable\n#{@options[:enable_password]}\nterminal pager 0\n	disable