Easiest way to get datatype string

[admin]

Use this example. It also handles sub-datatypes which don't have a dt table entry (e.g. 01.011 -> dt.bool).

Code:

mapping = {}
for key, value in pairs(dt) do
  mapping[ value ] = 'dt.' .. key
end

obj = grp.find('1/1/2')
dpt = obj.datatype
if dpt then
  dtname = mapping[ dpt ]

  if not dtname and dpt >= 1000 then
    dtname = mapping[ math.floor(dpt / 1000) ]
  end
end

log(dtname)