Turn off light in 4 hours

[admin]

If you want to turn objects that were on for a certain time, you need a scheduled or a resident script with large sleep time.

Add "AutoOff" tag to all objects that should be turned off after a certain time. The script below will work for both binary on/off and scaled 1-byte objects. Note that each "on" telegram will reset the auto-off timer for each object.

Code:

-- maximum time that object can be on, in seconds
ontime = 4 * 60 * 60

-- current timestamp, in seconds
now = os.time()

-- get all objects with AutoOff tag
objects = grp.tag('AutoOff')

-- check all objects
for _, object in ipairs(objects) do
 -- object is on
 if toboolean(object.data) then
   delta = now - object.updatetime

   -- timer expired, turn off
   if delta >= ontime then
     object:write(0)
   end
 end
end

Using os.sleep and event script is not a good idea - each event script runs in a separate process which will be active for 4 hours. This will certainly exhaust all LM memory sooner or later. The system will reboot automatically in this case.