Hello, I'm quite confident programmer, but as well quite new to node-red so I can solve my issue in other programming languages, but in nodered i need bit of help. I have let's say two different MQTT topics, which I need to have synced when CMND is received (they are 2way switches with tasmota - i…

yes, it have to be fully symetrical. Will try this one, thanks! [image] TotallyInformation: Yes, it takes some playing with some of the core nodes to get the hang of them. yeah, I still indeed find my programming languages more friendly as I clearly can see what my code is doing, nodered is…

[image] krizniq: I still indeed find my programming languages more friendly as I clearly can see what my code is doing, nodered is bit different approach, but for applications like this I really like it. Like anything else, Node-RED is a tool. You don't reach for a hammer when you need to uns…

[image] krizniq: Will try this one, thanks! Just a thought, in order that it works immediately on node-red restart the two stat topics should be Retained topics in MQTT.

all my switches are retaining their states, so it should. will report back when in production :wink: edit: it works indeed, let's see if there will be some weird rapid switching after some time of using this

@Colin how logic in Follow node would look like for three topics? also, is this flow usable for one topic solution? one topic means two or more switches using same mqtt topic (there is still need to invoke cmnd, as they are broadcasting only /state/ when pressed physically) Or there is better to…

[image] krizniq: how logic in Follow node would look like for three topics? You said you were a confident programmer so I expect you will be able to understand the existing logic in the function node. Javascript is not much different to C or other similar languages. Put a debug node showing…

well I indeed can understand how that works but in your follow there is comparison between two topic and else in case three topics logic would be 1 == 2 and 2 == 3 and 1 == 3 which sound bit complicated and full off if - elses, so I was asking basically if that's the way or if its there better one …

:wink: I've done this below This code works ok, but for some reason, it triggers cmnd 4times even there is function with 3 ouputs and rbe (its working same without rbe) [{"id":"18be5b2c.d9e275","type":"mqtt in","z":"69c9331c.66234c","name":"Entrance","topic":"home/entrance/light/stat/POWER2","qos…

Some initial notes: The return false should be return null. I have no idea what return false will do. Perhaps it has the same effect as return null but I don't know. If you do return [[ra,rb,rc]] then it will send all three messages to the first output, so you only need one output. The Join node…

Mqtt monitoring / syncing states, need bit of help

General

Colin 25 October 2019 16:01 15

There may well be ways of refactoring the code for the case with three inputs. I will leave that as an exercise for the reader.

Topic		Replies	Views
Repost State of Mqtt Topic if other Topic's state is 1 General	21	1326	11 April 2020
How to send an initial MQTT message to get the status of a tasmota switch? General	49	5266	6 December 2021
Two way switch infinite loop General function-node , mqtt	23	1307	3 September 2022
Problem with MQTT and switch update General	27	5406	26 November 2020
MQTT is driving me crazy with inconsistent doings General	77	2573	29 July 2020

Mqtt monitoring / syncing states, need bit of help

Related topics