MQTT - automatic sync all data with mqtt

Code:
------------------------------------------------------------
------------------- MQTT SUBSCRIVER  ------------------------
------------------------------------------------------------
if not broker then
  -- MQTT settings:
  broker = '192.168.xxx.xxx'
  port = 1883
  username = "xxxxxxx"
  password = "xxxxxxx"
  -- topic to object map
  mqtt_to_object = {
    ['xxx/in/status'] = '32/1/2',
    ['xxx/in/setpoin'] = '32/1/3',
  }
  
  -- object to topic map
  object_to_mqtt = {
    ['32/1/2'] = 'xxx/out/status',
    ['32/1/3'] = 'xxx/out/setpoint',
  }
  datatypes = {}
  grp.sender = 'mq'
  
  require('socket')
  for addr, _ in pairs(object_to_mqtt) do
    local obj = grp.find(addr)
    if obj then
      datatypes[ addr ] = obj.datatype
    end
  end
  mclient = require('mosquitto').new()
 
  mclient.ON_CONNECT = function(res, ...)
    log('mqtt connect status', res, ...)
    if res then
      for topic, _ in pairs(mqtt_to_object) do
        mclient:subscribe(topic)
      end
    else
      mclient:disconnect()
    end
  end
  mclient.ON_MESSAGE = function(mid, topic, payload)
    local addr = mqtt_to_object[ topic ]
    if addr then
      
      log("change address: " .. addr .." to value :"..payload)
      grp.write(addr, payload)
    end
  end
  mclient.ON_DISCONNECT = function(...)
    log('mqtt disconnect', ...)
    mclientfd = nil
  end
  function mconnect()
    local fd
    
 mclient:login_set(username, password)
    
    mclient:connect(broker)
    fd = mclient:socket()
    -- fd ref is valid
    if fd then
      mclientfd = fd
    end
  end
  mconnect()
  function publishvalue(event)
    -- message from us or client is not connected
    if event.sender == 'mq' or not mclientfd then
      return
    end
    local addr = event.dst
    local dpt = datatypes[ addr ]
    local topic = object_to_mqtt[ addr ]
    -- unknown object
    if not dpt or not topic then
      return
    end
    local value = busdatatype.decode(event.datahex, dpt)
    if value ~= nil then
      if type(value) == 'boolean' then
        value = value and 1 or 0
      end
      mclient:publish(topic, tostring(value))
    end
  end
  lbclient = require('localbus').new(1)
  lbclient:sethandler('groupwrite', publishvalue)
  lbclientfd = socket.fdmaskset(lbclient:getfd(), 'r')
  -- run timer every 5 seconds
  timer = require('timerfd').new(5)
  timerfd = socket.fdmaskset(timer:getfd(), 'r')
end
-- mqtt connected
if mclientfd then
  mclientfdset = socket.fdmaskset(mclientfd, mclient:want_write() and 'rw' or 'r')
  res, lbclientstat, timerstat, mclientstat =
      socket.selectfds(10, lbclientfd, timerfd, mclientfdset)
-- mqtt not connected
else
  res, lbclientstat, timerstat =
    socket.selectfds(10, lbclientfd, timerfd)
end
if mclientfd and mclientstat then
  if socket.fdmaskread(mclientstat) then
    mclient:loop_read()
  end
  if socket.fdmaskwrite(mclientstat) then
    mclient:loop_write()
  end
end
if lbclientstat then
  lbclient:step()
end
if timerstat then
  -- clear armed timer
  timer:read()
  if mclientfd then
    mclient:loop_misc()
  else
    mconnect()
  end
end