Script with updatable off-delay

[klaus407]

Good evening

I'm totally new to scripting, and this is my first post.
I have made a little script to trigger a KNX GA in function of two conditions, with an off-delay of 180s. If a new "true" telegram arrives before the 180s are over, I want the delay to start again. I have searched but didn't find an answer.
This is the script so far:

Code:

value_1 = grp.getvalue ('2/0/4')
value_2 = grp.getvalue ('2/0/6')

if value_1 == true and value_2 == true then
    grp.write ('2/0/7', true)
  elseif value_1 == false or value_2 == false then
  os.sleep(180)
  grp.write ('2/0/7', false)
  end

Thanks in advance
Klaus