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Questions tagged [mqtt]

MQTT - a light on the wire protocol for publish/subscribe. Clients and servers in various languages, C, Python, Erlang, C# and Java and Javascript.

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Mosquitto clients cannot talk through raspberry pi access point

I have set up a raspberry pi access point using the following guide: https://learn.adafruit.com/setting-up-a-raspberry-pi-as-a-wifi-access-point/install-software that basically makes you use hostapd ...
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ModuleNotFoundError running Python Script as systemd task

I have a Python script which I'd like to run at startup. However when I run it as a systemd service, it seems to be unable to find one of the modules. Here's the status message: ● mqttproc.service - ...
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Trying to fit a complicated bash string into a mqtt message

I am trying to fit the output of the following string (that is a simple number) df -hl | grep '/dev/mapper/4tb' | awk '{;percent+=$5;} END{print percent}' | column -t into the following mqtt message ...
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Send cat output to a mqtt broker?

I'm trying to read out a ACM0 file using the cat command, and then when receiving something, instead of it being printed out, to be sent to a MQTT broker, so I could subscribe to it. Is that possible? ...
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Mosquitto unable to use certificates from letsencrypt

I am trying to set up Mosquitto using this guide: https://www.digitalocean.com/community/tutorials/how-to-install-and-secure-the-mosquitto-mqtt-messaging-broker-on-ubuntu-18-04 I am using ubuntu 20.04 ...
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Recovering from USB dongle disconnection with systemd

If this is not the right place to post a this question, please say. I’m running zigbee2mqtt (Zigbee broker) on a USB dongle device (CC2531 with antenna, forgot the antenna model) and a Linux machine (...
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Disable client SSL certificate

I have generated client key certificate on self signed secure Mosquitto server. I have copied CA and client certificate with client key into client machine. Client subscription runs fine: ...
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Is it possible to encrypt traffic if I have only CA certificate?

I have simple secure (I guess) Mosquitto sever described in my previous question. Client machine has no any keys or certificate installed except single ca.crt certificate file generated and taken ...
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Ensure TLS communication security in Mosquitto

I have simple MQTT Mosquitto server that I'm trying to make secure. Mosquitto.conf: log_type all password_file /etc/mosquitto/mosquitto_users.txt pid_file /var/run/mosquitto.pid persistence true ...
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MQTT Error: Connection Lost

A 'listener' console was setup: mosquitto_sub -h test.mosquitto.org -t "myTopic" -v mosquitto_pub returns an error: pi@raspberrypi:~ $ mosquitto_pub -h test.mosquitto.org -t 'myTopic' -m 'hello ...
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Can the MQTT output be inferred from test server instructions?

A test MQTT broker can be found at: http://test.mosquitto.org/. The website suggests trying the command: mosquitto_sub -h test.mosquitto.org -t "#" -v I believe that the "#" denote a wildcard for ...
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Why does MQTT Mosquito attempt ot remove a package?

Context: OSMC distro on Raspberry Pi Zero-W. MQTT Mosquitto package installation failed. Why would an attempt to: sudo apt-get install mosquitto trigger an attempt to remove an OSMC package? The ...
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1 vote
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mosquitto_sub –d –t armtronix_mqtt Error: Unknown option '–d'

What information can be gleaned for corrective action to enable subscription to the example MQTT topic? The goal is to reproduce the test (subscribe & publish), per the instruction's Step 3: an ...
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Raspbian default MQTT Server?

As I understand it, Raspbian (2019-04-08-raspbian-stretch-full.img) features Node-Red out of the box. I have seen the youTube examples that show Node-Red configuring an MQTT server and left to wonder ...
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installing eclipse/paho.mqtt c++ client on Debian

I'm developing a C++ program (for a home IoT Project) on Debian 9 that needs to act as an MQTT client. I found paho.mqtt would be helpful in this regard, but none of the on-line documentations to ...
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Error compiling mosquitto_auth_plug

My config.mk file has the following settings: # Select your backends from this list BACKEND_CDB ?= no BACKEND_MYSQL ?= no BACKEND_SQLITE ?= no BACKEND_REDIS ?= no BACKEND_POSTGRES ?= yes BACKEND_LDAP ...
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Where is mosquitto source directory located?

I want to compile mosquitto-auth-plugin, which requires configuration of config.mk file, where one of the required parameter is to Specify the path to the Mosquitto sources MOSQUITTO_SRC =.Could you ...
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I can't seem to configure persistence in MQTT

I am trying MQTT on my Raspberry Pi running Raspbian. The basic setup works, but I can't seem to configure persistence. Following https://tutorials-raspberrypi.com/raspberry-pi-mqtt-broker-client-...
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2 votes
2 answers
1k views

MQTT as a variable on Bash?

Hi I want to try and convert a message receieved from MQTT into a variable so I can do an "IF script" using messages sent from a certain topic on mqtt. I tried this at top of script but didn't work: ...
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mosquitto bruteforce fail2ban failregex

I am trying to write fail2ban filter to block bruteforcing IP addresses which are trying to subscribe to username/password protected mosquitto service by guessing username/password combinations. On ...
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Bash Script: To log MQTT feed to txt file

I have written a small bash script (datalogger.sh) to store the mqtt data on to SD card inside a linux machine. The bash script is as below:- #!/bin/bash fileNumber=1 temp=1 // flag to check and ...
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How to tunnel mqtt sub data to pure data (pd) in bash

mosquitto_sub -v -h 127.0.0.1 -p 1883 -t 'gyro' | sed 's/[^ ]* //' | pdsend 3000 localhost udp this command doesn't output anything. while it should output a value I receive over mqtt. without sed '...
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Restart mosquitto - Unknown operation mosquitto [closed]

I am running the mosquitto broker on arch linux x64. I wanted to restart the mosquitto service by doing the following: sudo systemctl mosquitto restart But apparently I am prompted with Unknown ...
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567 views

Play and control multiple audio streams

I'm currently looking for some solution or advice. I need to play and control (yep, this is very important for me) many streams (probably from one source). For example.. my system plays some relax ...
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1 vote
1 answer
2k views

Pipe demon output to a function

I'm receiving a MQTT message with mosquitto_sub and I want to redirect the output (two strings) to a function. CLIENT: mosquitto_pub -d -t hello/world/ -m "Alessio,base64" On the server I have a ...
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