shutter timer based on detector

Code:
if not client then

  timers = {

    ['0/0/1'] = {

      output = '0/0/3', -- output value object

      timeout = 300, -- timeout in seconds

      onvalue = nil, -- value to send when timer is turned on (nil to disable)

      offvalue = true, -- value to send when timer is turned off (nil to disable)

    },

  }



  function timerset(timer, value, ticks)

    timer.ticks = ticks

    grp.write(timer.output, value)

  end



  grp.sender = 'tm'



  client = require('localbus').new(0.1)

  client:sethandler('groupwrite', function(event)

    local timer = timers[ event.dst ]

    if timer and event.sender ~= grp.sender then

      local value = tonumber(event.datahex, 16) or 0

      if value == 1 then

        timerset(timer, timer.onvalue, timer.timeout)

      end

    end

  end)

end



client:loop(1)



for _, timer in pairs(timers) do

  if timer.ticks then

    timer.ticks = timer.ticks - 1



    if timer.ticks == 0 then

      timerset(timer, timer.offvalue)

    end

  end

end