MQTT Publish and Subscribe Using Node Red

In this video tutorial we will look at using and configuring the MQTT publish and subscribe nodes.

The flow will demo a publishing messages and subscribing to topics and receiving messages.
We look at the main settings like birth and will messages,SSL security and user name and password.
We also look at creating new broker connections using different clients using different client ids.
MQTT publish and subscribe nodes share connection information and why you should be aware of this when editing nodes.
Finally we create a very simple open/closed sensor that you can use for testing.
Tutorial on Website

Other videos

Creating a Simple Controllable MQTT Sensor With Node-Red

The Node-Red Message Object for Beginners
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Create a Node Red Basic Flow - MQTT Subscribe Example
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How to Create a Node-Red MQTT Dashboard
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How to Store Data In Node Red Variables
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[jerhansiow]

Hi Steve, just wanted to point out you need to put the Client ID in quotation marks in Node-RED v0.20.5. It took me almost 2 days to figure this out so I hope it helps along the way for anyone who is attempting MQTT. Cheers.

[davidfont]

Well, this tutorial is two years old at the time of this message and Node-Red has changed a bit. At first, I could not find the objects that you used. After searching for "mqtt", I saw that there is "mqtt in" and "mqtt out". After the debug object was dropped, it changed to "msg.payload". That should be noted. Thank you.

[fin]

Love how simple you made the video. Everything seem to be working but I don't see anything in the debug window. I reviewed over and over all the settings. Where can I look next? I am using Node Red in Home Assistant. I never used used HA or MQTT before.

[ChampionCCC]

Excellent simple but clear tutorial. It summed up many questions in one go for me.

However, can you please confirm as to where the Broker messages log is found, or how you can view the broker messages (when you shared your RPi screen output)

[robinkhn]

for some reason it only works for me if I additionally use the "mosca-in-broker"-node. Can anyone explain why? If I build it like in the video, it doesnt work for me.

[Parvez_saifi]

can anyone help me for how i can publish data from influx database to live dashboard...?

[zareentabassum]

Hi steve, can you please tell me how do you configure server IP? means server means any physical device IP?

[jakubvala]

Hey Steve, why don't you use a broker from node-red such as aedes, it's easy to configure and easy to use. Or is there there some drawback?

[mandeepmails]

I’m grateful to see such an elaboration. Hats off to your knowledge and presentation skill. Undoubtedly I’m newbie into this, and exploring all I can, may be you could point me to the right place, if there’s a guide to get expertise over nodered. I’m still unable to correlate some basic stuff sometimes...my first project I’ve decided is to have complete dashboard for my room lighting controls. I’ve already bought one Nodemcu.v9 and got raspberry pi able to use gpio pins. But not over wireless advise me. Thanks in advance.

[PatricioBE]

Hi Steve, excellent tutorial. Is the ip address you use public? It does not work in my case. Thank you

[Theeltsag]

If anybody can answer me, how do we know in which IP our node-red mqtt broker runs?

[MrDenisJoshua]

Is there a node that can read a MQTT topic but a node that it can be use in the middle... a mean node that have an input and output
Thanks a lot

[tapiraiverde]

I would like to know how to protect with login and password the interface 1880 / ui dashboard in nodered I cannot find this information anywhere! I have the nodered installed in a VPS anybody enters and can control my automation how to solve it?

[vishnupriyatummala]

tq for the tutorial bro, how to create the server id of MQTT

[misterwilliam]

I have few questions on mqtt.
My mqtt client is bluepill with esp 01. Pi3 as mqtt server with nodered.
I want to control gpio out with nodered. But if i press switch in nodered there seems a delay to reach to client. Sometimes it doesn't even respond in client. Nodered switch stucks for a moment. I don't know if it is client problem or nodered problem

[dilipkumarmn]

Hi Steve, Thanks for sharing the tutorial, great work!!. could you please let me know how to configure the private IP address (example like in your video 192.168.1.157). I want to communicated with ESP8266 from my windows 10 PC. I am not able to establish a connection between ESP8266 and windows PC due to IP issues. It would be great if you could support in this regard.

Many thanks!

[msilaptop]

hello, how are you mqtt's ip address? I can only run localhost.

[abdolvakilfazli]

took same step but never got "open"