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achang · 23.05.2022, 13:11

Hello,

I have a few questions about the MQTT protocol.
I’ve tried setting the LM up so that it subscribes to each topic associated with a corresponding group address using a resident script and setting the interval to 0.
Then I tried publishing 40 topics, but it took approximately 2 seconds for the process to finish, and from the logs I can tell that it is taking time between the end of a single iteration of client.ON_MESSAGE and the beginning of the next iteration. However, I am not sure why that is the case. Any ideas on why it is taking some time between iterations within the for-loop? I’ve tried 2 variations of the script but had no luck.

Script 1:

Code:
require('json')

broker = "xx.xxx.xxx.xxx"
port = 1883
username = "xxx"
password = "yyy"
topic = "floor1/room1"
 
mqtt = require("mosquitto")
client = mqtt.new()

client.ON_CONNECT = function(status, rc, msg) -- true, 0, string connection  accepted
  
  if status then
    log("mqtt connected")
     client:subscribe("floor1/room1/0")
    client:subscribe("floor1/room1/1")
    client:subscribe("floor1/room1/2")
    client:subscribe("floor1/room1/3")
    client:subscribe("floor1/room1/4")
    client:subscribe("floor1/room1/5")
    client:subscribe("floor1/room1/6")
    client:subscribe("floor1/room1/7")
    client:subscribe("floor1/room1/8")
    client:subscribe("floor1/room1/9")
    client:subscribe("floor1/room1/10")
  else
    log("mqtt connect failed " .. tostring(msg))
    client:disconnect()
  end
end
 
client.ON_MESSAGE = function(mid, topic, payload_string)
  
  log("結果" .. payload_string)
  decoded = json.decode(payload_string)
  
    for i,m in ipairs(decoded.commands) do
    local ms = string.match(tostring(os.clock()), "%d%.(%d+)")
     log("書き込み開始　　group_address: "..tostring(m.alias).. ", value: " ..tostring(m.value).. ",   time:  " ..os.date("%Y-%m-%d %H:%M:%S") ..ms)
     grp.write(m.alias, m.value)
     log("書き込み終了　　group_address: "..tostring(m.alias).. ", value: " ..tostring(m.value).. ",   time:  " ..os.date("%Y-%m-%d %H:%M:%S") ..ms)
    end
  end

client:login_set(username, password)
status, rc, msg = client:connect(broker, port)
 
if status then
  client:loop_forever()
else
  log("connect failed: " .. tostring(msg))
end

Script 2

Code:
if not broker then
  broker = 'xx.xxx.xxx.xxx'

  function multiply(mult)
    return function(value)
      local num = tonumber(value)
      if num then
        return num * mult
      else
        return value
      end
    end
  end

  -- topic to object map
  mqtt_to_object = {
    ['floor1/room1/0'] = '0/0/2',
    ['floor1/room1/1'] = '0/0/5',
     ['floor1/room1/2'] = '0/0/10',
     ['floor1/room1/3'] = '0/0/11',
     ['floor1/room1/4'] = '0/0/12',
     ['floor1/room1/5'] = '0/0/13',
  }

  -- optional topic value conversion function
  mqtt_to_object_conv = {
    ['floor1/room1/0'] = multiply(100),
    ['floor1/room1/1'] = multiply(0.01),
  }

  -- object to topic map
  object_to_mqtt = {
    ['floor1/room1/status'] = 'floor1/room1/0',
    ['floor1/room1/status'] = 'floor1/room1/1',
     ['floor1/room1/status'] = 'floor1/room1/2',
     ['floor1/room1/status'] = 'floor1/room1/3',
     ['floor1/room1/status'] = 'floor1/room1/4',
     ['floor1/room1/status'] = 'floor1/room1/5',
  }

  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
      local ms = string.match(tostring(os.clock()), "%d%.(%d+)")
      log("書き込み開始　　group_address: "..tostring(topic).. ", value: " ..tostring(payload).. ",   time:  " ..os.date("%Y-%m-%d %H:%M:%S") ..ms)
      grp.write(addr, payload)
      log("書き込み終了　　group_address: "..tostring(topic).. ", value: " ..tostring(payload).. ",   time:  " ..os.date("%Y-%m-%d %H:%M:%S") ..ms)
    end
  end

  mclient.ON_DISCONNECT = function(...)
    log('mqtt disconnect', ...)
    mclientfd = nil
  end

  function mconnect()
    local fd

    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

For publishing, I am currently using the below code. I am using a for-loop to publish topics.

Code:
const mqttPublishA = () => {
    const aaa = [
      {"commands":[{"alias":"0/0/2","value":0}]},
      {"commands":[{"alias":"0/0/5","value":0}]},
      {"commands":[{"alias":"0/0/10","value":0}]},
      {"commands":[{"alias":"0/0/11","value":0}]},
      {"commands":[{"alias":"0/0/12","value":0}]},
      {"commands":[{"alias":"0/0/13","value":0}]},
      {"commands":[{"alias":"0/0/15","value":0}]},
      {"commands":[{"alias":"0/0/17","value":0}]},
      {"commands":[{"alias":"0/0/18","value":0}]},
      {"commands":[{"alias":"0/0/20","value":0}]},
      {"commands":[{"alias":"0/0/21","value":0}]},
      {"commands":[{"alias":"0/0/22","value":0}]},
      {"commands":[{"alias":"0/0/23","value":0}]},
      {"commands":[{"alias":"0/0/24","value":0}]},
      {"commands":[{"alias":"1/0/2","value":0}]},
      {"commands":[{"alias":"1/0/3","value":0}]},
      {"commands":[{"alias":"1/0/4","value":0}]},
      {"commands":[{"alias":"1/0/5","value":0}]},
      {"commands":[{"alias":"1/0/6","value":0}]},
      {"commands":[{"alias":"1/0/7","value":0}]},
      {"commands":[{"alias":"1/0/8","value":0}]},
      {"commands":[{"alias":"1/0/9","value":0}]},
      {"commands":[{"alias":"1/0/10","value":0}]},
      {"commands":[{"alias":"1/0/11","value":0}]},
      {"commands":[{"alias":"1/0/12","value":0}]},
      {"commands":[{"alias":"1/0/13","value":0}]},
      {"commands":[{"alias":"1/0/15","value":0}]},
      {"commands":[{"alias":"1/0/16","value":0}]},
    ]

    aaa.forEach((element, index) => mqttPublish({
      topic: `floor1/room1/${index}`,
      qos: 0,
      payload: JSON.stringify(element),
    }));
  }

  const mqttPublish = (context) => {
    console.log(context)
    if (client) {
      const { topic, qos, payload } = context;
      client.publish(topic, payload, { qos }, error => {
        if (error) {
          console.log('Publish error: ', error);
        }
      });
    }
  }

Also, are there other ways to make the MQTT protocol process faster in general?
For example,

parallelize the subscribe process
create a new resident script for each group address, separating the subscribe process

Pretty much new to LM and MQTT, so any help is welcome.
Thank you in advance!

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