using Backlog0

[Ulf Holt]

Not sure if this is the right place to ask, but pleas tell me if I should delete the question.

I need to set timezone on a device which is only available via MQTT. The command is: Backlog0 Timezone 99; TimeStd 0, 0, 10, 1, 3, 60; TimeDST 0, 0, 3, 1, 2. 120. I am using Node Red to display info from my devices. Not sure how to do it, suppose I can use an injection node and a MQTT-out node, but have never tried something like this before, and don't even know if it  is possible. 

Best regards 

Ulf H. 

[Justin Adie]

Yes. You can use an inject node set to manual.  Set the topic and payload in the inject node and then add an mqtt out node to the canvas and join them into a flow.  Configure the mqttout node with the right server information.   

Then click deploy and click the inject node when the flows have restarted.

Or you can use an mqtt client and publish directly from that.  Either command line or gui: the result is the same.  

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[ulf....@gmail.com]

Thank you, Justin.

 

I agree, and that was how far I got, but I miss the syntax on how to set up the payload and the topic in the injection node and likewise the topic on the MQTT out node. I get info from the device using tele/Kjeller/sensor and I try using cmd/Kjeller in the topic for the MQTT in node, and injecting the command from the inject node, but that does not work, so there is definitely an error (or more).

[Justin Adie]

For me I would use something like

location/device/cmnd/backlog0

As the topic and the message would be

Timezone 99; TimeStd 0,0,10,1,3,60; TimeDST 0,0,3,1,2,120

I know that most people prefer the cmnd keyword to be the root of the topic.  Always seemed illogical to me 

Also in the message body you had your timedst command incorrectly using a dot rather than comma. 

[ulf....@gmail.com]

I’m still stuck, since I don’t understand where to put what.

 

I try to use msg.payload type msg value tele/kjeller/cmnd/backlog0 and topic Timezone 99; TimeStd 0,0,10,1,3,60; TimeDST 0,0,3,1,2,120 in the inject node and the topic same in the mqtt-out node.

 

This does not work, but I get no error message or warning. I have hooked up a debug node to tele/Kjeller/# to check any messages

[Justin Adie]

In the inject node

Set msg.topic to  cmnd/kjeller/backlog0

Set msg.payload to Timezone 99; TimeStd 0,0,10,1,3,60; TimeDST 0,0,3,1,2,120

Don't set topic in the mqtt node.

For the debug node remember that kjeller is not the same as Kjeller.  Case matters in mqtt 

[Philip Knowles]

I would use MQTT Explorer. Not sure why backlog0 is being used though. Also, I think it should be cmnd not tele

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From: 'Justin Adie' via TasmotaUsers <sonof...@googlegroups.com>
Sent: 27 April 2025 10:10
To: Ulf Holt <ulf....@gmail.com>
Cc: TasmotaUsers <sonof...@googlegroups.com>
Subject: Re: using Backlog0

 

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