MODBUS TCP SLAVE

[palomino]

Hello.
I have a question. I need to send and receive data through the LM in Modbus slave mode.
When I write the data to my register, the master can read it, but when the master try to send me a data,  doesn't work.  I can't read the register. I think that the master can not write me in my register, I always see nill when i try to read. can you help

Code:

if not mb then
  require('luamodbus')
  
  mb = luamodbus.tcp()
  res, err = mb:open('0.0.0.0', 502)
  res, err = mb:setslave(2)
  log("Modbus slave IN : 502/2")
 
  function setintmo(grpaddr, regaddr)
   
    local value = grp.getvalue(grpaddr) or 0
    res, err = mb:setregisters(regaddr, value)
   
  end ------- setint(grpaddr, regaddr)

  function setintresgis (direc, regist)
         
       local valuer = mb:readregisters(regist)
    log (valuer)
    if valuer ~= nill then
       grp.write(direc, valuer)
      end
       
    end --- setintresgis (direc, regist)
 
 
    function updateregisters()
    setintmo('32/1/2', 2)
  end --- updateregisters()

    function updateinputregisters()
     setintresgis('32/1/4',10)
    end
   
   
  mb:setmapping(100, 100, 100, 100)
  updateregisters()
  updateinputregisters()
 
end --- mb

mb:handleslave()

curr = os.time()
if curr ~= prev then
updateregisters()
updateinputregisters()
log ('A')
  prev = curr

end

me?