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Code:
if not client then

  -- each group has 3 fields:

  -- tag - status object tag

  -- output - status output object

  -- mode - calculate mode (and/or/avg)

  groups = {

  }



  -- time to wait between last telegram from any status in group and update

  updatedelay = 1



  -- object value cache

  values = {}



  -- object datatype cache

  datatypes = {}



  -- send update only when value changes

  grp.checkupdate = function(alias, value)

    if values[ alias ] ~= value then

      grp.write(alias, value)

    end

  end



  calc = {}



  -- AVERAGE value

  calc['avg'] = function(group)

    local result, count, value = 0, 0



    for _, address in ipairs(group.objects) do

      value = values[ address ]



      -- number must be in [0..100] range

      if type(value) == 'number' then

        result = result + value

        count = count + 1

      -- boolean true is 100%, false is 0%

      elseif type(value) == 'boolean' then

        if toboolean(value) then

          result = result + 100

        end



        count = count + 1

      end

    end



    if count > 0 then

      result = math.floor(result / count + 0.5)

      grp.checkupdate(group.output, result)

    end

  end



  -- AND gate

  calc['and'] = function(group)

    local result = true



    for _, address in ipairs(group.objects) do

      result = result and toboolean(values[ address ])

    end



    grp.checkupdate(group.output, result)

  end



  -- OR gate

  calc['or'] = function(group)

    local result = false



    for _, address in ipairs(group.objects) do

      result = result or toboolean(values[ address ])

    end



    grp.checkupdate(group.output, result)

  end



  -- prepare each group

  for _, group in ipairs(groups) do

    object = grp.find(group.output)



    -- cache output status object value and datatype

    values[ object.address ] = object.data

    datatypes[ object.address ] = object.datatype

    group.output = object.address



    -- group input status object list

    group.objects = {}



    -- find all status objects and cache values and datatypes

    objects = grp.tag(group.tag)

    for _, object in ipairs(objects) do

      values[ object.address ] = object.data

      datatypes[ object.address ] = object.datatype

      table.insert(group.objects, object.address)

    end



    -- force update on first run

    group.timer = 0



    -- calc function reference

    group.fn = calc[ group.mode ]

  end



  -- handle group writes

  function eventhandler(event)

    local dst, datatype



    dst = event.dst

    datatype = datatypes[ event.dst ]

    -- unknown object, stop

    if not datatype then

      return

    end



    values[ dst ] = dpt.decode(event.datahex, datatype)



    -- check if any group needs to be updated

    for _, group in ipairs(groups) do

      for _, address in ipairs(group.objects) do

        if address == dst then

          group.timer = updatedelay

        end

      end

    end

  end



  require('genohm-scada.eibdgm')

  client = eibdgm:new({ timeout = 0.25 })

  client:sethandler('groupwrite', eventhandler)

end



tsec, tusec = os.microtime()

client:step()

delta = os.udifftime(tsec, tusec)



-- check if any group has an active timer

for _, group in ipairs(groups) do

  timer = group.timer



  if timer then

    timer = timer - delta



    -- timer expired, run calc function

    if timer <= 0 then

      group.fn(group)

      timer = nil

    end



    group.timer = timer

  end

end