# How to connect node-red with mqtt broker
**URL:** https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207
**Category:** Dashboard
**Tags:** node-red-dashboard
**Created:** [20 October 2023 07:05 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207 "2023-10-20T07:05:05Z")
**Posts on this page:** 11
**Page:** 3
### Author:  [@jbudd](https://discourse.nodered.org/u/jbudd)
#### Post date: [22 November 2023 13:21 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/45 "2023-11-22T13:21:49Z")
1. Where did you got the topic `command///req/#` from?
Hint: It is nonsense.
2. Why does it have repeated `/` characters?
3. Do you know the special meanings of `#` and `+` in mqtt topics?
If not, you need to do some reading about mqtt. I don't know your native language so I cannot recommend suitable material.
4. What do you expect that a message published to `command///req/#` will do?
You cannot publish to a wildcard topic.
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### Author:  [@Naveen](https://discourse.nodered.org/u/Naveen)
#### Post date: [22 November 2023 13:44 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/46 "2023-11-22T13:44:35Z")
> [@Naveen](#):
>
> can you provide me mqtt and test nodes (server, topic, connection and security) details.
can you provide me examples of mqtt and test nodes (server, topic, connection and security) details.
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### Author:  [@jbudd](https://discourse.nodered.org/u/jbudd)
#### Post date: [22 November 2023 14:11 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/47 "2023-11-22T14:11:57Z")
[quote="Naveen, post:46, topic:82207"]
> [@Naveen](#):
>
> can you provide me examples of mqtt and test nodes (server, topic, connection and security) details
Yes of course. I have an mqtt broker running on a Raspberry Pi at 192.168.1.11. It is Mosquitto.
I have to use a username and password to connect to it. My username is jbudd and my password is Password1.
In this simple flow the inject node sets msg.payload "Hello" and msg.topic "test".
The mqtt-out node accepts the topic from msg.topic.
The mqtt-in node subscribes to topic "test".
For more complicated setups I might use a topic like reactor1/coretemperature or reactor1/radiation
So that's my setup. Since I have no idea what your setup is like you might find you need different settings.
**But since your mqtt node is Connected, all you need is a sensible topic**
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### Author:  [@jbudd](https://discourse.nodered.org/u/jbudd)
#### Post date: [22 November 2023 14:21 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/48 "2023-11-22T14:21:51Z")
Please note @Naveen , if you ignore my questions again I will not try and help you in future.
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### Author:  [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)
#### Post date: [22 November 2023 15:34 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/49 "2023-11-22T15:34:40Z")
The flow you posted above looks nothing like the Test-Flow I posted as item-23 of this thread.
Are you sure you 'imported' the Node-RED flow and tried it out as it should work without any problems with the test-server at Eclipse?? I suggest you get the basic flow working before getting more complicated.
Here is the basic flow again, I assume you know how to 'import' the Node-RED flow from here?
```auto
[{"id":"a4261bec1cbf0778","type":"tab","label":"Flow 39","disabled":false,"info":"","env":[]},{"id":"1678825c5d940452","type":"mqtt in","z":"a4261bec1cbf0778","name":"","topic":"test","qos":"2","datatype":"auto-detect","broker":"2d2f5234db1e57bd","nl":false,"rap":true,"rh":0,"inputs":0,"x":150,"y":220,"wires":[["9ef778879f8ca7c5"]]},{"id":"981d13a9a47220e3","type":"mqtt out","z":"a4261bec1cbf0778","name":"","topic":"test","qos":"","retain":"","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"2d2f5234db1e57bd","x":330,"y":140,"wires":[]},{"id":"e553550126382b67","type":"inject","z":"a4261bec1cbf0778","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"Hello World","payloadType":"str","x":170,"y":140,"wires":[["981d13a9a47220e3"]]},{"id":"9ef778879f8ca7c5","type":"debug","z":"a4261bec1cbf0778","name":"repsonse","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":340,"y":220,"wires":[]},{"id":"2d2f5234db1e57bd","type":"mqtt-broker","name":"Eclipse","broker":"test.mosquitto.org","port":"1883","clientid":"","autoConnect":true,"usetls":false,"protocolVersion":"4","keepalive":"60","cleansession":true,"autoUnsubscribe":true,"birthTopic":"","birthQos":"0","birthRetain":"false","birthPayload":"","birthMsg":{},"closeTopic":"","closeQos":"0","closeRetain":"false","closePayload":"","closeMsg":{},"willTopic":"","willQos":"0","willRetain":"false","willPayload":"","willMsg":{},"userProps":"","sessionExpiry":""}]
```
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### Author:  [@Naveen](https://discourse.nodered.org/u/Naveen)
#### Post date: [23 November 2023 09:27 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/50 "2023-11-23T09:27:56Z")
Hii, i'm using this topic in mqtt broker, it's not the issue with this topic, i have connected mqtt broker with node-red, i'm able to receive the command & control messages in the node-red.
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [23 November 2023 09:41 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/51 "2023-11-23T09:41:38Z")
So if you are now able to connect, is the problem solved?
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### Author:  [@Naveen](https://discourse.nodered.org/u/Naveen)
#### Post date: [23 November 2023 09:59 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/52 "2023-11-23T09:59:17Z")
yes, it's solved but i have a doubt that how to connect and emit the device in node-red
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### Author:  [@Naveen](https://discourse.nodered.org/u/Naveen)
#### Post date: [23 November 2023 10:02 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/53 "2023-11-23T10:02:27Z")
yes i tried, it's working fine.
Thanks
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### Author:  [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)
#### Post date: [23 November 2023 14:49 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/54 "2023-11-23T14:49:04Z")
So since you say you have got my test flow working your next step is to sort out your own MQTT broker.
You can either install a local broker on your Raspberry Pi (e.g. Mosquitto) or sign-up with a remote broker.
There are a number of companies that offer a "free-tier" - one of them (that I use) is [BeeBotte](https://beebotte.com/).
The choice will depend on the location (local or remote) of where your data originates.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [22 January 2024 14:50 UTC](https://discourse.nodered.org/t/how-to-connect-node-red-with-mqtt-broker/82207/55 "2024-01-22T14:50:02Z")
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