# Can't connect my node-red with mqtt broker (mosquitto) on pi4

**URL:** <https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683>\
**Category:** General\
**Tags:** function-node, mqtt\
**Created:** [24 February 2023 12:25 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683 "2023-02-24T12:25:25Z")\
**Posts on this page:** 11\
**Page:** 1

<div class="post-metadata">

**Author:** ![ZEus](https://avatars.discourse-cdn.com/v4/letter/z/a4c791/32.png) [@ZEus](https://discourse.nodered.org/u/ZEus)\
**Post date:** [24 February 2023 12:25 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/1 "2023-02-24T12:25:25Z")

</div>

hello everyone i can't connect my node\_red with mosquitto broker that i created in pi moreover i can't connect with mqtt explorer on the server anyone have any idea ???

---

<div class="post-metadata">

**Author:** ![jbudd](https://avatars.discourse-cdn.com/v4/letter/j/5f8ce5/32.png) [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Post date:** [24 February 2023 12:35 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/2 "2023-02-24T12:35:14Z")

</div>

> [@ZEus](#):
>
> anyone have any idea ???

Yup.

I think we need to know what you did to install Mosquitto in pi and whether Node-red and mqtt\_explorer are on the same pi or a different machine.

---

<div class="post-metadata">

**Author:** ![ZEus](https://avatars.discourse-cdn.com/v4/letter/z/a4c791/32.png) [@ZEus](https://discourse.nodered.org/u/ZEus)\
**Post date:** [24 February 2023 12:39 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/3 "2023-02-24T12:39:24Z")

</div>

on the same pi ofc

---

<div class="post-metadata">

**Author:** ![mudwalker](https://avatars.discourse-cdn.com/v4/letter/m/47e85d/32.png) [@mudwalker](https://discourse.nodered.org/u/mudwalker)\
**Post date:** [24 February 2023 12:41 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/4 "2023-02-24T12:41:09Z")

</div>

> [@jbudd](#):
>
> I think we need to know what you did to install Mosquitto in pi

Still need this answered before anyone can help you.

---

<div class="post-metadata">

**Author:** ![ZEus](https://avatars.discourse-cdn.com/v4/letter/z/a4c791/32.png) [@ZEus](https://discourse.nodered.org/u/ZEus)\
**Post date:** [24 February 2023 12:43 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/5 "2023-02-24T12:43:42Z")

</div>

> **[Install Mosquitto Broker Raspberry Pi | Random Nerd Tutorials](https://randomnerdtutorials.com/how-to-install-mosquitto-broker-on-raspberry-pi/)**
>
> This tutorial shows how to install the Mosquitto Broker for MQTT communication on a Raspberry Pi board.

i followed this

---

<div class="post-metadata">

**Author:** ![jbudd](https://avatars.discourse-cdn.com/v4/letter/j/5f8ce5/32.png) [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Post date:** [24 February 2023 12:45 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/6 "2023-02-24T12:45:42Z")

</div>

> [@ZEus](#):
>
> ofc

Hmm. I don't think I can help any further.

---

<div class="post-metadata">

**Author:** ![ZEus](https://avatars.discourse-cdn.com/v4/letter/z/a4c791/32.png) [@ZEus](https://discourse.nodered.org/u/ZEus)\
**Post date:** [24 February 2023 12:53 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/7 "2023-02-24T12:53:12Z")

</div>

oh no problem thank you anyways

---

<div class="post-metadata">

**Author:** ![cymplecy](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/cymplecy/32/2773_2.png) [@cymplecy](https://discourse.nodered.org/u/cymplecy)\
**Post date:** [24 February 2023 13:26 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/8 "2023-02-24T13:26:51Z")

</div>

What does ofc mean

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [24 February 2023 13:37 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/9 "2023-02-24T13:37:14Z")

</div>

What does this command show?  
`sudo systemctl status mosquitto`  
Please copy/paste the result, not screenshot.

---

<div class="post-metadata">

**Author:** ![dynamicdave](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dynamicdave/32/96_2.png) [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)\
**Post date:** [24 February 2023 13:47 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/10 "2023-02-24T13:47:37Z")

</div>

Here's a very basic Node-RED flow to help you check your MQTT setup on your Raspberry Pi-4.  
 ![basic_test_mqtt](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/6/b6d62c5a349a219afa7da799e10a58332c8baebc.png)  
Can you see if that will work in your setup.

This is what you should see in the debug node...  
 ![mqtt_result](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/c/bcba935f36f0e7e12a5fa0fdc97ac0b990861282.png)

```auto
[{"id":"27c4228b9d8246f0","type":"tab","label":"Basic_MQTT_test","disabled":false,"info":"","env":[]},{"id":"e0b777abd4ce3cb9","type":"inject","z":"27c4228b9d8246f0","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"Hello world","payloadType":"str","x":180,"y":140,"wires":[["a5fe1e47fa208fe6"]]},{"id":"82029c324c9c4d88","type":"debug","z":"27c4228b9d8246f0","name":"debug 31","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":340,"y":200,"wires":[]},{"id":"447c2455ab506cbc","type":"mqtt in","z":"27c4228b9d8246f0","name":"","topic":"test","qos":"2","datatype":"auto-detect","broker":"fe4d4074.20ff58","nl":false,"rap":true,"rh":0,"inputs":0,"x":170,"y":200,"wires":[["82029c324c9c4d88"]]},{"id":"a5fe1e47fa208fe6","type":"mqtt out","z":"27c4228b9d8246f0","name":"","topic":"test","qos":"","retain":"","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"fe4d4074.20ff58","x":330,"y":140,"wires":[]},{"id":"a51bbe850ae556ce","type":"comment","z":"27c4228b9d8246f0","name":"Change the 'server' IP to match your setup","info":"","x":440,"y":100,"wires":[]},{"id":"fe4d4074.20ff58","type":"mqtt-broker","name":"RPi_156 server_Use_Me","broker":"192.168.1.156","port":"1883","clientid":"","autoConnect":true,"usetls":false,"compatmode":false,"protocolVersion":"4","keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","birthMsg":{},"closeTopic":"","closeQos":"0","closePayload":"","closeMsg":{},"willTopic":"","willQos":"0","willPayload":"","willMsg":{},"userProps":"","sessionExpiry":""}]

```

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [25 April 2023 13:47 UTC](https://discourse.nodered.org/t/cant-connect-my-node-red-with-mqtt-broker-mosquitto-on-pi4/75683/11 "2023-04-25T13:47:37Z")

</div>

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.