number.lua

local ffi = require("ffi")
local cast = ffi.cast
local ctype = ffi.typeof("float *")
local function get_num(bytes)
    local res = cast(ctype, bytes)[0]
    if not res then
        print(res, type(res), res or 0)
        res = 0
    end
    return res
end

local num = 0 

while true do
    local bytes = "\xFF\xFF\xFF" .. string.char(math.random(250, 255))
    local res = get_num(bytes)
    print(num, res)
    num = num + res
end