With another project in which some one pointed out a problem with how I was controlling tasmota devices. I have 2 bulbs. They are called (from MQTT) BULB-1 and BULB-2 Which kind of made sense for me, but it is flawed if I want to control all of them. It would be better if I called them: BULB/1…

This video shows how it works (starting from the timestamp that is relevant) [How to Sync Lights and Switches with Device Groups - Tasmota Tips Episode 7]

You can listen to wildcard topics, the output shows the full topic, so you know to which bulb to send the command to. Leave the topic in the output mqtt node empty and use the topic that you received. [Screenshot 2020-08-10 at 09.48.21]

Thanks. I have been pointed towards group topics. So that may be of some help for this problem.

That should also work, never looked into it myself.

I just need to find a good reference to group topics.

[image] Trying_to_learn: I just need to find a good reference to group topics. Have you read thru this: MQTT Topics, Wildcards, & Best Practices – MQTT Essentials: Part 5 Learn about MQTT Topics, naming conventions, MQTT $SYS topics, MQTT Prefix, MQTT Topic Wildcards, and more in…

Yeah, but it kind of confused me. The link @bakman2 posted seems to be good. Still applying the changes. Not done yet. Woo Hoo! It seems to work!

It is called a grouptopic, but in reality it has nothing to do with mqtt, as it works via UDP directly between the tasmota devices.

yes, but that link filled most of the gap I still had. Dumb question about topics...... In the switch node...... What is the wild card for there? *? eg: This is what I have: BULB/+/tele/LWT But the + is a wild card. So what do I put in the field of the switch node?

FYI from the Hivemq post: Wildcards When a client subscribes to a topic, it can subscribe to the exact topic of a published message or it can use wildcards to subscribe to multiple topics simultaneously. A wildcard can only be used to subscribe to topics, not to publish a message. There are two di…

Node-RED

Node-RED Forum

MQTT topic help please Wild card use

General

bakman2 10 August 2020 08:44 12

Look what the topic looks like when you receive it in a debug node.

is it called blbla/+ ?

Topic		Replies	Views
MQTT all device polling -- wildcard use? General	7	211	27 July 2023
What's the best way to send an MQTT command to all subscribed topics? General	4	256	9 November 2024
Efficiently subscribe to multiple MQTT topics using one MQTT node General	6	7276	22 July 2020
MQTT-nodes with dynamic topics General mqtt	8	454	3 December 2024
Publishing to a wildcard MQTT topic disconnects all MQTT nodes General	1	1012	18 March 2020

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

MQTT topic help please Wild card use

Related topics