MQTT Broker Project with 2024 FW Problem

[admin]

Try changing object value and the topic will appear in MQTT Explorer.

If you want to keep last topic values for other clients then you need to enable retain flag for messages. To do this replace last line in publishvalue:

Code:

mclient:publish(topic, tostring(value))

With this:

Code:

mclient:publish(topic, tostring(value), 0, true)

Note that LM MQTT broker does not have any persistence. If the broker is restarted then retained topics are lost until new value is published.


Additionally you can modify the script to publish all mapped values after a connection to broker is established. Replace mclient.ON_CONNECT with this:

Code:

  mclient.ON_CONNECT = function(res, ...)
    log('mqtt connect status', res, ...)

    if res then
      for addr, topic in pairs(object_to_mqtt) do
        local value = grp.getvalue(addr)

        if value ~= nil then
          if type(value) == 'boolean' then
            value = value and 1 or 0
          end

          mclient:publish(topic, tostring(value), 0, true)
        end
      end

      for topic, _ in pairs(mqtt_to_object) do
        mclient:subscribe(topic)
      end
    else
      mclient:disconnect()
    end
  end