Best way to decode Modbus

[admin]

The most correct way to do this is via bit shifts (bit.rshift and bit.band) but since you need to split the value into 4 bit values you can simply use the datahex string:

Code:

value = event.datahex

values = {}
for i = 1, 4 do
  char = value:sub(i, i)
  values[ i ] = tonumber(char, 16)
end

log(values)