# \#mqtt

**URL:** https://discourse.nodered.org/tag/mqtt/24.md

[Latest](https://discourse.nodered.org/latest.md) · [Categories](https://discourse.nodered.org/categories.md) · [Tags](https://discourse.nodered.org/tags.md)

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## [Trying to Track Down Trackers](https://discourse.nodered.org/t/trying-to-track-down-trackers/101361)

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**Author:** [@oldie](https://discourse.nodered.org/u/oldie)\
**Replies:** 3\
**Last updated:** [26 June 2026 11:02 UTC](https://discourse.nodered.org/t/trying-to-track-down-trackers/101361 "2026-06-26T11:02:29Z")

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Bit of a left field question but I'm trying to trace why my ZimaBoard2 running only a NodeRed V5.0 with UIBuilder V7.7.4 (and Mosquitto) Docker containers is trying to contact these URL's, about 500 times per day. Is thi…

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## [\[ANNOUNCE\] node-red-contrib-lsh-logic - a stateful orchestration node extracted from a real home automation stack](https://discourse.nodered.org/t/announce-node-red-contrib-lsh-logic-a-stateful-orchestration-node-extracted-from-a-real-home-automation-stack/100777)

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**Author:** [@labodj](https://discourse.nodered.org/u/labodj)\
**Replies:** 8\
**Last updated:** [4 May 2026 19:33 UTC](https://discourse.nodered.org/t/announce-node-red-contrib-lsh-logic-a-stateful-orchestration-node-extracted-from-a-real-home-automation-stack/100777 "2026-05-04T19:33:34Z")

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Hi all, I wanted to share a Node-RED node that I finally extracted and published after years of using it inside my own home automation setup. The broader project started during a house renovation about seven years ago,…

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## [\[ANNOUNCE\] node-red-contrib-homie-home-assistant-discovery - Homie MQTT devices to Home Assistant discovery](https://discourse.nodered.org/t/announce-node-red-contrib-homie-home-assistant-discovery-homie-mqtt-devices-to-home-assistant-discovery/100904)

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**Author:** [@labodj](https://discourse.nodered.org/u/labodj)\
**Replies:** 1\
**Last updated:** [4 May 2026 19:26 UTC](https://discourse.nodered.org/t/announce-node-red-contrib-homie-home-assistant-discovery-homie-mqtt-devices-to-home-assistant-discovery/100904 "2026-05-04T19:26:11Z")

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Hi all, I wanted to share a new Node-RED node I extracted while cleaning up the Home Assistant discovery side of my Labo Smart Home work. The important part is that this node is not LSH-specific. It is a generic Homie…

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## [Zigbee2MQTT and TRV602z](https://discourse.nodered.org/t/zigbee2mqtt-and-trv602z/100465)

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**Author:** [@SomersetSmartHome](https://discourse.nodered.org/u/SomersetSmartHome)\
**Replies:** 17\
**Last updated:** [1 March 2026 10:07 UTC](https://discourse.nodered.org/t/zigbee2mqtt-and-trv602z/100465 "2026-03-01T10:07:47Z")

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I haven't used Zigbee before but I need local control of TRV's - my broadband has been poor over the last few months and relying on the Tuya cloud anymore isn't an option for me. I've installed and run zigbee2mqtt on my…

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## [Mqtt-check node](https://discourse.nodered.org/t/mqtt-check-node/100365)

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**Author:** [@Dimos](https://discourse.nodered.org/u/Dimos)\
**Replies:** 3\
**Last updated:** [12 February 2026 11:12 UTC](https://discourse.nodered.org/t/mqtt-check-node/100365 "2026-02-12T11:12:38Z")

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Goodmorning, I created a simple flow, where I connect to an MQTT Server and read some values. Now I want to add an indicator, where I will check the status of the server every 5 minutes and have it visible on my scree…

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## [My latest uibuilder creation](https://discourse.nodered.org/t/my-latest-uibuilder-creation/100196)

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**Author:** [@oldie](https://discourse.nodered.org/u/oldie)\
**Replies:** 16\
**Last updated:** [30 January 2026 15:39 UTC](https://discourse.nodered.org/t/my-latest-uibuilder-creation/100196 "2026-01-30T15:39:24Z")

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This is my latest creation with uibuilder, which just keeps getting better. Now, with your favourite (mine, Codex) built into VSCode, just describe what you want and magically a script.js, index.html and style.css appear…

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## [Sharing global variable across multiple instances](https://discourse.nodered.org/t/sharing-global-variable-across-multiple-instances/99781)

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**Author:** [@michaelbusry](https://discourse.nodered.org/u/michaelbusry)\
**Replies:** 5\
**Last updated:** [17 December 2025 19:21 UTC](https://discourse.nodered.org/t/sharing-global-variable-across-multiple-instances/99781 "2025-12-17T19:21:31Z")

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I have been given the task of refactoring out flows into multiple instances. What I found is there are many global variables that the different flows use. I'm looking for the easiest way to share my globals with the fou…

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## [Node-RED version of MQTT Explorer](https://discourse.nodered.org/t/node-red-version-of-mqtt-explorer/99738)

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**Author:** [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Replies:** 33\
**Last updated:** [15 December 2025 16:46 UTC](https://discourse.nodered.org/t/node-red-version-of-mqtt-explorer/99738 "2025-12-15T16:46:32Z")

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Hi all, In a recent thread, I promised @Trying\_to\_learn that I would revisit a project I started quite a long time ago now, which is a replacement for the MQTT Explorer desktop app. So here is my first draft. It is stil…

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## [MQTT nodes need a dummy broker entry to allow fully dynamic settings?](https://discourse.nodered.org/t/mqtt-nodes-need-a-dummy-broker-entry-to-allow-fully-dynamic-settings/99811)

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**Author:** [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Replies:** 4\
**Last updated:** [30 November 2025 15:02 UTC](https://discourse.nodered.org/t/mqtt-nodes-need-a-dummy-broker-entry-to-allow-fully-dynamic-settings/99811 "2025-11-30T15:02:35Z")

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In trying to implement a Node-RED/UIBUILDER replacement for MQTT Explorer, I'm hitting some issues that I'm not sure can be worked around. While both the mqtt-in and -out nodes allow dynamic settings, they also require …

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## [Csv value to mqtt](https://discourse.nodered.org/t/csv-value-to-mqtt/99372)

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**Author:** [@gerribaldi](https://discourse.nodered.org/u/gerribaldi)\
**Replies:** 5\
**Last updated:** [15 October 2025 18:46 UTC](https://discourse.nodered.org/t/csv-value-to-mqtt/99372 "2025-10-15T18:46:23Z")

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HI, i read a csv file from a ftp server and want to sent the values to a mqtt broker. My point know is, how can i create for each value in a line separate topic. The csv have this fields: sn; volume 1; volume 2; volum…

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## [MQTT Out still connecting to Thingsboard](https://discourse.nodered.org/t/mqtt-out-still-connecting-to-thingsboard/99138)

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**Author:** [@adysaputra](https://discourse.nodered.org/u/adysaputra)\
**Replies:** 18\
**Last updated:** [23 September 2025 08:34 UTC](https://discourse.nodered.org/t/mqtt-out-still-connecting-to-thingsboard/99138 "2025-09-23T08:34:12Z")

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My goal is to send data to Thingsboard with the device name “A.” However, when I deploy the Node Mqtt Out status, it always says connecting. I have confirmed that the device token is correct, the server is the IP of the …

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## [Dynamic broker connection - best practice](https://discourse.nodered.org/t/dynamic-broker-connection-best-practice/98759)

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**Author:** [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Replies:** 1\
**Last updated:** [21 August 2025 08:42 UTC](https://discourse.nodered.org/t/dynamic-broker-connection-best-practice/98759 "2025-08-21T08:42:24Z")

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I want to efficiently connect and subscribe to a mqtt broker in 1 go. I have the following in a function node: const action = \["disconnect","connect","subscribe"\] const force = true const topic = "zigbee2mqtt/#" const …

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## [MQTT still connecting](https://discourse.nodered.org/t/mqtt-still-connecting/98254)

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**Author:** [@HerrKrauss](https://discourse.nodered.org/u/HerrKrauss)\
**Replies:** 2\
**Last updated:** [22 July 2025 19:28 UTC](https://discourse.nodered.org/t/mqtt-still-connecting/98254 "2025-07-22T19:28:00Z")

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Hi, i have a raspberry pi with a module AI to recongnition of gender, this script send a JSON by mqtt, but want i try to catched, my node mqtt doesnt work in node-red. In the server spot i have the ip of the server web,…

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## [Load test with hundreds of JSON messages](https://discourse.nodered.org/t/load-test-with-hundreds-of-json-messages/97410)

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**Author:** [@Hoboclown](https://discourse.nodered.org/u/Hoboclown)\
**Replies:** 18\
**Last updated:** [16 June 2025 12:48 UTC](https://discourse.nodered.org/t/load-test-with-hundreds-of-json-messages/97410 "2025-06-16T12:48:27Z")

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I've only just installed Node RED and I'm looking for a bit of direction for my project I've created an application for my companies tracking devices that send cell tower and GPS data over mqtt and I was looking to load…

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## [How to create MQTT In nodes with variable topics](https://discourse.nodered.org/t/how-to-create-mqtt-in-nodes-with-variable-topics/97537)

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**Author:** [@egibson940](https://discourse.nodered.org/u/egibson940)\
**Replies:** 2\
**Last updated:** [10 June 2025 20:06 UTC](https://discourse.nodered.org/t/how-to-create-mqtt-in-nodes-with-variable-topics/97537 "2025-06-10T20:06:27Z")

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Currently I have a subflow with a MQTT in node that receives all sensor messages and I have to filter for the one I want based on the subflow property/environment variable sensorName. Instead of subscribing the MQTT In …

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## [Use config property of subflow in mqtt-nodes](https://discourse.nodered.org/t/use-config-property-of-subflow-in-mqtt-nodes/97431)

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**Author:** [@L4RS](https://discourse.nodered.org/u/L4RS)\
**Replies:** 9\
**Last updated:** [10 June 2025 04:33 UTC](https://discourse.nodered.org/t/use-config-property-of-subflow-in-mqtt-nodes/97431 "2025-06-10T04:33:39Z")

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Hello, I have to connect my software to four (or more - in the future) MQTT-Servers a once. All MQTT-Servers are of the same kind. My idea is to create a subflow which contains the \[mqtt-in\]- and \[mqtt-out\]-nodes. The s…

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## [MQTT topics creates loop with Serial Port](https://discourse.nodered.org/t/mqtt-topics-creates-loop-with-serial-port/96914)

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**Author:** [@WannabeMaker](https://discourse.nodered.org/u/WannabeMaker)\
**Replies:** 1\
**Last updated:** [5 May 2025 22:26 UTC](https://discourse.nodered.org/t/mqtt-topics-creates-loop-with-serial-port/96914 "2025-05-05T22:26:00Z")

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Hello, I have question regarding how to deal with MQTT topics. I have the following flow that I use to control a sensirion MFC5500. The flow works well without bug. The one problem that I have is when I want to do r…

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## [Dynamic IP in dynamic-mqtt out node](https://discourse.nodered.org/t/dynamic-ip-in-dynamic-mqtt-out-node/96448)

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**Author:** [@SofTMeha](https://discourse.nodered.org/u/SofTMeha)\
**Replies:** 2\
**Last updated:** [8 April 2025 10:47 UTC](https://discourse.nodered.org/t/dynamic-ip-in-dynamic-mqtt-out-node/96448 "2025-04-08T10:47:08Z")

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Hello, I’m working with Node-RED and trying to use the MQTT Dynamic Broker out node to connect to an MQTT broker using a dynamically provided flow-level IP address. The goal is to pass the IP address to the broker dynam…

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## [MQTT connection over proxy](https://discourse.nodered.org/t/mqtt-connection-over-proxy/96442)

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**Author:** [@iALARM](https://discourse.nodered.org/u/iALARM)\
**Replies:** 1\
**Last updated:** [7 April 2025 06:26 UTC](https://discourse.nodered.org/t/mqtt-connection-over-proxy/96442 "2025-04-07T06:26:04Z")

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Hi everone An HTTP request component has the ability to set a proxy. However, an MQTT component does not have proxy settings. What is the solution when the MQTT needs to connect to a public MQTT broker through a proxy? …

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## [Missing MQTT in version 4.09](https://discourse.nodered.org/t/missing-mqtt-in-version-4-09/96324)

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**Author:** [@B3l3s96](https://discourse.nodered.org/u/B3l3s96)\
**Replies:** 2\
**Last updated:** [29 March 2025 12:21 UTC](https://discourse.nodered.org/t/missing-mqtt-in-version-4-09/96324 "2025-03-29T12:21:18Z")

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Hello, yesterday i upgraded node red to new version 4.0.9. Today i discovered that display which use MQTT didnt display data. I noticed that in node red missing MQTT functions. Any ide how to solve this problem ?

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## [With msg.action=connect sent twice stuck the MQTT node in "connecting"](https://discourse.nodered.org/t/with-msg-action-connect-sent-twice-stuck-the-mqtt-node-in-connecting/96309)

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**Author:** [@greengolfer](https://discourse.nodered.org/u/greengolfer)\
**Replies:** 7\
**Last updated:** [28 March 2025 16:05 UTC](https://discourse.nodered.org/t/with-msg-action-connect-sent-twice-stuck-the-mqtt-node-in-connecting/96309 "2025-03-28T16:05:28Z")

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I am using a lot the dynamic configuration of MQTT nodes. Using msg.broker and msg.action, I can configure the remote broker and connect to it. I noticed that when msg.action=connect is sent twice (I know it shouldn't …

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## [MQTT - Postgrestor](https://discourse.nodered.org/t/mqtt-postgrestor/96292)

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**Author:** [@G1BS0N](https://discourse.nodered.org/u/G1BS0N)\
**Replies:** 2\
**Last updated:** [27 March 2025 17:54 UTC](https://discourse.nodered.org/t/mqtt-postgrestor/96292 "2025-03-27T17:54:39Z")

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Good morning everyone, I have been experiencing issues for the past four days with connecting my MQTT to a PostgreSQL node. My MQTT is connected to a Shelly device to read temperatures, humidity, and device power. Does …

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## [FlowFuse Team Broker: MQTT QOS 1 or 2 not working unless client disconnects cleanly?](https://discourse.nodered.org/t/flowfuse-team-broker-mqtt-qos-1-or-2-not-working-unless-client-disconnects-cleanly/96246)

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**Author:** [@stevemot](https://discourse.nodered.org/u/stevemot)\
**Replies:** 8\
**Last updated:** [25 March 2025 16:25 UTC](https://discourse.nodered.org/t/flowfuse-team-broker-mqtt-qos-1-or-2-not-working-unless-client-disconnects-cleanly/96246 "2025-03-25T16:25:44Z")

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Hi, we are using FlowFuse enterprise 2.12 self-hosted on Docker to manage a small collection of Node-RED instances. We are now exploring Team Broker as we plan to expand our use to build some large event-driven integrati…

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## [MQTT clients list and additional details](https://discourse.nodered.org/t/mqtt-clients-list-and-additional-details/95934)

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**Author:** [@itolond](https://discourse.nodered.org/u/itolond)\
**Replies:** 12\
**Last updated:** [14 March 2025 10:37 UTC](https://discourse.nodered.org/t/mqtt-clients-list-and-additional-details/95934 "2025-03-14T10:37:27Z")

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Node-red and MQTT newbie here: Scenario: Several ESP32/Raspberry Pi devices clients connected to a MQTT broker on the local LAN, e.g (CONNECT packet) and have a response (CONNACK) Node-Red server What I am trying to…

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## [Smarter programming with subflow and sensors](https://discourse.nodered.org/t/smarter-programming-with-subflow-and-sensors/95945)

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**Author:** [@MrX](https://discourse.nodered.org/u/MrX)\
**Replies:** 4\
**Last updated:** [12 March 2025 15:29 UTC](https://discourse.nodered.org/t/smarter-programming-with-subflow-and-sensors/95945 "2025-03-12T15:29:41Z")

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I want to use one common subflow for many types of sensors to get the sensors value. The sensors value is received from the MQTT message with "msg.topic" = "tele/xxx/SENSOR", sent with TELEPERIOD interval. A "Environme…

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## [Moving Node Red project to Raspberry pi 5 - cannot connect to broker](https://discourse.nodered.org/t/moving-node-red-project-to-raspberry-pi-5-cannot-connect-to-broker/95822)

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**Author:** [@invictagunner](https://discourse.nodered.org/u/invictagunner)\
**Replies:** 5\
**Last updated:** [6 March 2025 15:38 UTC](https://discourse.nodered.org/t/moving-node-red-project-to-raspberry-pi-5-cannot-connect-to-broker/95822 "2025-03-06T15:38:57Z")

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I am using EMQX broker with connection information as follows:- MQTT Connection Information Address:xxxxxxxxxxxxxxxx.emqxsl.com MQTT over TLS/SSL Port:8883 WebSocket over TLS/SSL Port:8084 CA Certificate:CA Certificate…

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## [Node Red AEDES MQTT Broker Question](https://discourse.nodered.org/t/node-red-aedes-mqtt-broker-question/95733)

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**Author:** [@Jeffro](https://discourse.nodered.org/u/Jeffro)\
**Replies:** 25\
**Last updated:** [5 March 2025 06:11 UTC](https://discourse.nodered.org/t/node-red-aedes-mqtt-broker-question/95733 "2025-03-05T06:11:13Z")

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Hello! I am trying to make an escape room bomb prop, similar to what Alastair Aitchison created in this video: Google Search Since this video was created in 2020, the issue I am running into is that the original Node …

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## [Zigbee2Mqtt dimmer -\> wifi bulb brightness](https://discourse.nodered.org/t/zigbee2mqtt-dimmer-wifi-bulb-brightness/95583)

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**Author:** [@Caesar\_Naykid](https://discourse.nodered.org/u/Caesar_Naykid)\
**Replies:** 9\
**Last updated:** [24 February 2025 13:29 UTC](https://discourse.nodered.org/t/zigbee2mqtt-dimmer-wifi-bulb-brightness/95583 "2025-02-24T13:29:19Z")

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Hello, I have a zigbee knob (Knob link) connected to my system with Zigbee2MQTT and I want to dim a WIFI light with it. It's set up and I have a Zigbee2mqtt node in Node-Red with a debug node and when i turn the knob,…

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## [Joining messages based on matching topic / value](https://discourse.nodered.org/t/joining-messages-based-on-matching-topic-value/95390)

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**Author:** [@Csarugo](https://discourse.nodered.org/u/Csarugo)\
**Replies:** 13\
**Last updated:** [18 February 2025 20:08 UTC](https://discourse.nodered.org/t/joining-messages-based-on-matching-topic-value/95390 "2025-02-18T20:08:20Z")

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Hi Team, New user, both to node red and the forums, so please bear with me. I have multiple devices with multiple sensors in the field and I need to join two messages. Sounds simple enough but my sensors report at diff…

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## [MQTT subscribe to selectable Shelly](https://discourse.nodered.org/t/mqtt-subscribe-to-selectable-shelly/95339)

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**Author:** [@duaw](https://discourse.nodered.org/u/duaw)\
**Replies:** 7\
**Last updated:** [13 February 2025 09:22 UTC](https://discourse.nodered.org/t/mqtt-subscribe-to-selectable-shelly/95339 "2025-02-13T09:22:34Z")

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Hi, there! I have a real Shelly with its original name like shelly2pm-12345678 and I have a virtual Shelly shelly2pm only present in Node-RED. I prepared the UI so the user can select one or another to send the message…

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