grp.checkwrite and supported datatypes

[Gadjoken]

Hello,
It's possible to send value only when this value is > x like :

Code:

require('bacnet')

for i = 1, 14 do
  id = 16000 + i
  value = bacnet.readvalue(id, 'analog value', 1) -- Prise de la temp. Ambiante
  if value > 7 then
    grp.checkwrite('5/2/' .. i, value)
  end
end

Sometimes i have error :
Resident script:6: attempt to compare number with string
stack traceback:

Thanks.
B.R.