grefab

require 'open3'

def log s
  p Time.now.to_s + " #{s}"
end

def is_device_there?(mac_addr)
  exit_status = -1
  Open3.popen3("sudo l2ping -c1 -v #{mac_addr}") do |stdin, stdout, stderr, wait_thr|
    exit_status = wait_thr.value