MQTT message to receive status of all devices

[GammaKappa]

If I send this call in a browser window

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/json.htm?type=devices&used=true

Domoticz replies with the status of all my devices. This is exactly what I need.
However I would like to achieve the same thing using a MQTT call in Node Red en also receive the answer via MQTT.
In Node Red I tried sending a MQTT message with a

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message.payload={"command"="devices"&"used"=true}

but Domoticz does not recognize this command. The log says MQTT: Invalid data received!
What is the correct MQTT message to send to Domoticz ?

[waaren]

What is the correct MQTT message to send to Domoticz ?

There is no native command to do this in domoticz. I created a dzVents script a while ago to do something similar. The script can be modified to trigger on a specific MQTT command (something like

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{"command":"customevent", "event":"broadcastAllDevices","data":"switches"} 

Please check this topic to see if it might work for your case.

[GammaKappa]

Triggering the dzvents script via MQTT results in "Unknown command received: customevent".
Could it be that I need dzevents 3.0.0 to use customvents?
I am still on Domoticz 4.10717 which uses dzvents 2.4.19 .

[waaren]

Could it be that I need dzVents 3.0.0 to use customEvents?
I am still on Domoticz 4.10717 which uses dzVents 2.4.19 .

Yes, you do need dzVents >= V3.0.0 if you want to use customEvents. You could try using a virtual device as trigger for the script.
Is there any specific reason why you do not update to a later domoticz version?

[GammaKappa]

I tried triggering the script with a dummy switch using

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script:///home/pi/domoticz/scripts/dzVents/generated_scripts/BroadcastAllDevices.lua

This generates a script command error 32256, so I changed the permissions for the script to 755.
Now it gives me error 512. I am new to dzvents so I'm not sure what to do now.

The reason I postponed updating Domoticz was the issue that it did not like Jessie and completely messed up my Domoticz.
I read that Domoticz 2020.2 is compatible with Jessie, so I may give it a try later on.

[waaren]

I tried triggering the script with a dummy switch using

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script:///home/pi/domoticz/scripts/dzVents/generated_scripts/BroadcastAllDevices.lua

This generates a script command error 32256, so I changed the permissions for the script to 755.
Now it gives me error 512. I am new to dzvents so I'm not sure what to do now.

The reason I postponed updating Domoticz was the issue that it did not like Jessie and completely messed up my Domoticz.
I read that Domoticz 2020.2 is compatible with Jessie, so I may give it a try later on.

domoticz 2020.2 needs Buster
Please read the dzVents wiki on how to prepare for dzVents and install the script.

When not yet familiar with dzVents please start with reading Get started Before implementing (~ 5 minutes). Special attention please for "In Domoticz go to Setup > Settings > Other and in the section EventSystem make sure the checkbox 'dzVents enabled' is checked. Also make sure that in the Security section in the settings you allow 127.0.0.1 to not need a password. dzVents uses that port to send certain commands to Domoticz. Finally make sure you have set your current location in Setup > Settings > System > Location, otherwise there is no way to determine nighttime/daytime state."

[GammaKappa]

Success !

I removed the script call from the dummy switch definition and renamed the switch to MQTT-Broadcast, the exact name in that is in the script.
I did not realize that :

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local scriptTrigger = 'MQTT-Broadcast'

was referring to the triggering switch name .

Thanks waaren !

[GammaKappa]

I fine tuned the MQTT broadcast by using the MQTTSyncTrigger label in the description field of the devices I want to sync.
This works fine, however about 1 second after all the messages arrived, they are being send again so I receive them twice.

It's not a big issue but is there a way to avoid this ?

[waaren]

I fine tuned the MQTT broadcast by using the MQTTSyncTrigger label in the description field of the devices I want to sync.
This works fine, however about 1 second after all the messages arrived, they are being send again so I receive them twice.

It's not a big issue but is there a way to avoid this ?

It should not happen with the latest version of the script I posted.
Can you share your script in it's current state and the log it creates ?

[GammaKappa]

I found the error.

The MQTT broadcast was triggered by an on/off type dummy switch with an automatic 'off ' after 3 sec.
So it triggered the script again again when it went to 'off '' .

I changed it to a 'push on' switch, and now is OK.