Resending timer script

[Tokatubs]

I am looking for a script that i can use to send a value every xx minutes. 

Found this that could work. But this is once, and i need it to resend for example every 30 minutes to pulse an output. 

Could anyone help me with such a script.

Code:

-- group address or name
addr = '1/1/1'

-- find required object
obj = grp.find(addr)

-- object exists and current state is "on"
if obj and obj.data then
  -- delta is in seconds
  delta = os.time() - obj.updatetime

  -- switch off when timer expires
  if delta >= 50 * 60 then
    grp.write(addr, false)
  end
end