Counter and Trend

[admin]

Erwin, that check is incorrect
256 * 256 * 256 * 256 = 0x100000000 (4294967296)
Maximum value for unsigned 32-bit integer is 0xFFFFFFFF (4294967295)

Code:

if event.getvalue() then
  value = grp.getvalue('1/1/1') + 1
  
  -- overflow check
  if value > 0xFFFFFFFF then
    value = 0
  end

  grp.update('1/1/1', value)
end