[SOLVED] Properly fetch MQTT states

[rkrisi (Kristof Rado)]

Thanks for your long detailed post!
A few answers:

@rlkoshak

My question for you, how are the topics set up? Are there separate topics for commanding the lights and the lights reporting state updates?

No I don’t I use the same topic, just with command and state attribute, like this:

mqtt=">[mosquitto:shellies/shelly1-056C51/relay/0/command:command:*:MAP(shelly.map)],<[mosquitto:shellies/shelly1-056C51/relay/0:state:MAP(shelly.map)]"

All of my MQTT switches follows this method, only the transform is different…

@rlkoshak

Make sure the type filed is command and not state or *.

What do you mean by this? I have one Switch which can send command and updates the state of that Switch Item as well.
I have set my AllLight group to mapdb persistence with everyChange, restoreOnStartup. Is that correct? It seems working but maybe I’m missing here also something.

@rlkoshak

Remember, MQTT was created for use in the industrial oil industry with remote devices and sensors on oil pipelines and stuff like that.

Didn’t know that, I haven’t read the story of it, just a few things which was required to get to know better this protocoll. However I thought that this is not mainly created for this!

Thanks!

[rlkoshak (Rich Koshak)]

@rkrisi

What do you mean by this? I have one Switch which can send command and updates the state of that Switch Item as well.
I have set my AllLight group to mapdb persistence with everyChange, restoreOnStartup. Is that correct? It seems working but maybe I’m missing here also something.

If you have an MQTT binding config like

>[mosquitto:some/topic:state:*:some transform]

or

>[mosquitto:some/topic:*:some transform]

then then both commands and updates will be published to some/topic. You want to use command so it only publishes the message when the Item receives a command.

[vzorglub (Vincent Regaud)]

@rlkoshak

This would make a good tutorial post, maybe with how to send the empty message using mosquitto_pub. All of us at one point or another run into retained messages problems and clearing them is not intuitive.

Done:

Clearing MQTT retained messages

Clearing retained messages in mosquitto Purpose The purpose of this tutorial is to present solutions to clear retained messages in the Eclipse Mosquitto MQTT Broker. Retained messages can be troublesome and/or unwanted. Many mosquitto tutorials included a retain option in the configuration and setup of mosquitto. This is likely to create problems in the future. This tutorial is created for Linux users with a package installation on mosquitto. Other users will have to find the files and paths r…