Comments on: Testing Mosquitto Broker and Client on Raspberry Pi

By: Jose Barbosa

Jose Barbosa — Wed, 22 Jan 2025 14:44:34 +0000

Hi Rui, Sara,
I got all this to work fine. Thank you for the great explanation on both MQTT articles. I use PI to publish and subscribe via command window and I use a Pico with the code to do the same.
I get readings from the pico temperature.
I publish controls for 2 relays connected to the pico. All good.
Now I want to include python code in the pi itself to do the same as I am doing on the command window.
Is there any tutorial with this type of samples?
Thank you

By: Ronni

Ronni — Fri, 22 Mar 2024 03:40:59 +0000

In reply to Ola Abrahamsson. I didnt quite know what yoiu meant by external server but, if you are having trouble sending and recieving from two different pi's Did you add a line to your publishing code of -h 192.168.0.XXX defining your server? I managed to send between 2 pi's that way

By: Ronni

Ronni — Fri, 22 Mar 2024 03:37:30 +0000

Hi Peeps
Is there a way to use mosquitto clients from a python script? please tell me you have a book that covers this 😀
I am trying to make a rf doorbell that sends a mqtt message to my node red raspi mosquitto broker and while the tutorial I have found uses paho I cant for the life of me follow the set up of the clients. I can get it all to run as a direct pub/sub using your method, but not from a script.

By: Sara Santos

Sara Santos — Thu, 23 Feb 2023 10:47:25 +0000

In reply to Adzy.

Hi.
I’m not sure that I understood your question…
Are you using Node-RED?
If so, you can use a node called Big Timer. It provides plenty of schedule options.
Regards,
Sara

By: Adzy

Adzy — Wed, 22 Feb 2023 22:34:08 +0000

Hi,

Another Newbie…

I’m looking into MQTT to interact with an Raspberry Pi Process Control System
I understand monitoring and the lamp on / lamp off, but is there any way to change a value, i.e. from now on lamp goes on at 8pm in stead of 9pm

By: Sara Santos

Sara Santos — Fri, 09 Dec 2022 17:39:43 +0000

In reply to Ola Abrahamsson.

Hi.
Did you follow these instructions and allowed remote access: https://randomnerdtutorials.com/how-to-install-mosquitto-broker-on-raspberry-pi/?
Regards,
Sara

By: Ola Abrahamsson

Ola Abrahamsson — Thu, 08 Dec 2022 06:41:18 +0000

Hey! Thanks for a very good review of an MQTT installation. Was able to test it locally and it worked fine. Having trouble getting it to work against external calls and getting no error messages. have added lines in conf. – file.
How can I test external connections to the server?
Can I see if the server has received a call?

By: Sara Santos

Sara Santos — Sun, 27 Nov 2022 11:10:39 +0000

In reply to Jorge Ticona.

Hi.
Check if you’ve enabled remote access. See this tutorial: https://randomnerdtutorials.com/how-to-install-mosquitto-broker-on-raspberry-pi/
Scroll down to the section called “Enable remote access”.
You can set up a username and password or choose not to have one.
If you set up a username and password you need to pass them in the command when trying to publish or subscribe.
That tutorial shows an example for that.
Regards,
Sara

By: Jorge Ticona

Jorge Ticona — Sun, 27 Nov 2022 02:08:59 +0000

In reply to Vinayak. same, how do you solve it?

By: Vinayak

Vinayak — Tue, 22 Nov 2022 16:49:20 +0000

Client (null) sending CONNECT
Client (null) received CONNACK (5)
Connection error: Connection Refused: not authorised.
Client (null) sending DISCONNECT

Hi I’m getting this error when I’m trying to subscribe to the testTopic.

Could you guide me through this.