MQTT 2.4: Switch with different topics for command on/off

Add-ons Bindings
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1

Hi Everyone!
I am moving my mqtt to 2.4 and i am struggling with an item that is controlling a tuya socket with the great tuya-mqtt script.
The old item is like this:

Switch	 LivingRoom_Tuya1 			"Tuya1" <poweroutlet_eu> (LivingRoom, gLight)  {mqtt="<[syn:tuya/socket/1582xxx/9179xxx/myip/state:state:default:.*],>[syn:tuya/socket/1582xxx/9179xxx/myip/command/on:command:ON:true], >[syn:tuya/socket/1582xxx/9179xxx/myip/command/off:command:OFF:false]"}

With the new binding i don’t have probelms to see the state with the thing/channel concept, but i can’t find in the binding documentation how to manage different topics ( command/on & command/off) and payloads (true/false) for the command to the ON/OFF status.

I am at this point and i don’t know how to continue. Of course commandTopic is wrong but i don’t know how to manage!

Thing mqtt:topic:tuyasocket1 (mqtt:broker:synBroker) {
    Channels:
        Type switch : tuya1 "Tuya Socket 1" [ stateTopic="tuya/socket/1582xxx/9179xxx/myip/state", commandTopic="tuya/socket/1582xxx/9179xxx/myip/command/", on="on", off="off" ]
    }```

Somebody already solved this? Could you help me to find the proper documentation?

Thank you!
2

I’m on the phone so can’t get you the right link. Have a look for the openhab2-addons GitHub repository and find the mqtt.generic binding. The readme file in there is the newest not yet published documentation. It contains an example matching your case.

Cheers

3

Hi David, thanks for your answer.
I think you refer to https://github.com/openhab/openhab2-addons/blob/master/addons/binding/org.openhab.binding.mqtt.generic/README.md
But there it’s the opposite : 2 states and 1 command :frowning:
I hope that with upgrading we don’t lose functionalities! Would be very bad to write rules for such a simple need!

4

Oh right. This is indeed not covered by mqtt2. But for a reason. The Mqtt topic layout of that script is broken.

There are accepted conventions on how to use Mqtt and one is to have a single state expressed as one topic. The script should be adopted to how Mqtt is supposed to be used or indeed a rule is necessary in openhab.

Alternatively two channels with a different command topic each linked to the same item will do it maybe? (The second channels item link would be set with a follow profile).

Sorry that I can’t help more here.

Cheers

5

Maybe i found a solution. It actually involves the modification of tuya-mqtt to be able to use only one command topic.
More details here:
https://community.openhab.org/t/solved-oh-2-4-mqtt-binding-generic-thing-statetopic-working-commandtopic-not-working/63619/17
I will test it and let you know!

6

If I recall, the tuya mqtt bridge code was changed and you should be able to use one topic only.
taken from:

Change device state (by payload)
Use with OpenHAB 2.X MQTT bindings or others where only a single command topic is preferred
    tuya/<tuyaAPI-type>/<tuyaAPI-id>/<tuyaAPI-key>/<tuyaAPI-ip>/command // State as Payload (on,off)