I am new to nodered and mqtt , i follow all the steps shows on youtube videos to connect nodemcu to nodered via mqtt broker but failed. kindly see the attached pictures .. The Nodered is running on windows 10 laptop MQTT installed on laptop as well as in nodered Through Cmd command I can see mqtt…

Hi .. thats not how Firewizard52 wrote the two commands Lose the # infront of the commands, as these comment out the line. allow_anonymous true listener 1883 after that restart your mosquitto server and try reconnecting with the 192.168.43.160 ip

Thanks Friend .. I was wrong and not checked the debug node menu

Looks Mqtt is perfectely working but why my nodemcu is unable to connect to mqtt.. What could be the reason ..

If I use the ip address 192.168.43.160 as server then mqtt not connect , but if i use server as localhost the mqtt connected and the test is successful .. How can solve the issue, looks like the something is wrong with ip address , but I checking my ip by cmd ipconfig .. and in firewall also allowed…

[image] sam_r: My ip configuration is set to auto , not manual , if that could be the reason ? Yes, if the IP of the Broker changed then it wouldn't connect and if the IP of the Broker changed and the NodeMCU points to the old IP, then the Nodemcu would not be able to connect.

But with the current ip also not connect .. if i modify the ip everywhere (arduino program, node flows) and put the present ip , still can't connect

you need to look at the documentation of mosquitto 2.0.4 for windows 64 I think it may be the listener port option: listener port [bind address/host/unix socket path] Listen for incoming network connection on the specified port. A second optional argument allows the listener to be bound to a spe…

# listener port-number [ip address/host name/unix socket path] #listener # By default, a listener will attempt to listen on all supported IP protocol # versions. If you do not have an IPv4 or IPv6 interface you may wish to # disable support for either of those protocol versions. In particular, note…

It saying it is open to all ip's

Node-RED

Node-RED Forum

Nodemcu cannot connect to mqtt

General

dceejay 6 January 2021 09:24 34

is the broker configured to only listen to local connections ?

MQTT Connection lost by node-red

Topic		Replies	Views
MQTT-In Not Connecting General	69	9108	7 November 2019
How to connect node-red with mqtt broker Dashboard node-red-dashboard	49	1599	23 November 2023
Oh great! Now my MQTT is not working! General	32	7169	8 February 2019
My Node Red just died General	24	1642	20 October 2021
Node Red AEDES MQTT Broker Question General mqtt	25	358	5 March 2025

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

Nodemcu cannot connect to mqtt

Related topics