How to Install The Mosquitto MQTT Broker- Windows and Linux

install mosquitto iconMosquitto is an open source message broker that Implements MQTT versions 3.1 and 3.1.1.

It is available as a free download for Windows and Linux,and In this tutorial you will learn how to install the mosquitto MQTT broker (server) on both on Windows and Linux, and then test the installation.

Installing The Mosquitto Broker on Windows

Note: The term server instead of broker as been adopted as of MQTT version 3.1.1

There are two possibilities:

  • Quick Install
  • Standard Install

Quick Windows Install

The problem with the standard install is that there are certain dependencies that need to be installed before you do the mosquitto install.

This involves installing software and copying files from the install into the Mosquitto install folder.

However, if you have already installed Mosquiito on another windows machine e.g. XP and want to install it on another machine e.g. Windows 10 then you can just copy the directory containing the mosquitto files to the new machine.

I copied my windows XP install (32 bit) onto a window10 (64bit) machine and a Windows 7 machine and it worked OK.

I’ve create a zipped directory which I’ve used on Windows 10 and Windows 7.

You can download it here– Don’t forget to virus check it let me know if you have any problems with it.

Just unzip it go to the directory and run the broker manually as covered later.

Video – How to Install Mosquitto Broker on Windows

Standard Install On Windows

As mentioned earlier the big problem with the Windows Install is that there are lots of dependencies that you also need to install or have installed.

However the advantage is that you can install Mosquitto as a service which starts automatically. This is not important for a test environment

First you will need to download the Windows install files from here.

mosquitto-windows-install-files

I used the cygwin version (not sure of the exact differences ).

There are good detailed step by step install instructions for windows here.

It is important that you install the addition files, and copy them to the mosquitto directory as mentioned in the article.

If you don’t then when you try to start mosquitto you will get an error message complaining about a missing dll.

mosquitto-windows-install-failed

In the above case it was the cygcrypto-1.0.0.dll.

When you have installed Mosquitto and copied the additional files then this is what the mosquitto directory looks like when finished.

mosquitto-folder-windows

Note 1: above screenshot is missing some files from cygwin as it was installed and the files were in the right path.

Note 2: there is readme-windows.txt file in the mosquitto install directory that you should read

Here is a complete list of additional files that you need:

cygcrypto-1.0.0.dll
cyggcc_s-1.dll
cygssl-1.0.0.dll
cygwin1.dll
cygz.dll
libeay32.dll
libssl32.dll
msvcr100.dll
pthreadVC2.dll
ssleay32.dll

Starting Mosquitto on Windows

If you have installed Mosquitto using the install .exe and ticked the start as service box then the mosquitto broker starts as a service.

This is what you want in a production environment but for testing you will want to start it manually.

To stop the mosquitto server if it is running as a service. go to control panel>admin tools>services.

mosquitto-windows-services

You can stop the broker and change the automatic startup settings so it doesn’t automatically start on Windows start up.

Note: On my install (on XP) it wouldn’t start as a service and gave error code 1053. This wasn’t a problem because I wanted to start it manually anyway.

To start the broker manually open a command prompt and go to the mosquitto install directory and type mosquitto.

mosquitto-windows-start-manual

You can also use various command line switches. Type

mosquitto -h

for help.

mosquitto-help

Installing The Mosquitto Broker on Linux

The download links and install directions for Linux are here

I followed the install instructions for Ubuntu but they seemed to miss a few important steps. Here are the steps I used for Linux Mint.

  • sudo apt-add-repository ppa:mosquitto-dev/mosquitto-ppa
  • sudo apt-get update
  • sudo apt-get install mosquitto
  • sudo apt-get install mosquitto-clients

It should automatically start mosquitto.

To Stop and start the service I needed to use

  • sudo service stop mosquitto
  • sudo service start mosquitto #see note later

Most sites I discovered where using the format.

  • sudo /etc/init.d/mosquitto stop

However it seems newer installations use upstart initialization system instead of the init.d initialization system.

The stop/start scripts start the mosquitto broker in the background and also use the default mosquitto.conf file in the /etc/mosquitto/ folder.

mosquitto-folder-linux

If you want to see control messages on the console then you need to start the mosquitto broker from a command line.

You first need to to stop the broker from running, and then type:

mosquitto -v

start-mosquitt-linux

Testing The Install

To test it is running use command:

  • netstat –at for Linux and netstat -a for Windows

netstamqtt-broker

You should see the Mosquitto broker running on port 1883 as shown in the screen shot above.

Starting Mosquitto Using a Configuration file

The configuration file (mosquitto.conf) that comes with the install is completely commented out, and the MQTT broker doesn’t need it.

To start mosquitto using a configuration file use the following command:

  • mosquitto -c filename

On windows the mosquitto.conf template file is found in the mosquitto directory.

On linux you can find the mosquitto.conf template file in the /etc/mosquitto/ folder.

It is a good idea to create a copy of this file before editing it.

Enabling Logging

This is useful for troubleshooting. Logging is already enabled in the default config file so all you need do is start mosquitto with this config file.

Important Note: on Linux although you stop mosquito from running using the command

  • sudo stop mosquitto

to start it use:

  • mosquitto -c /etc/mosquitto/mosquitto.conf

On Windows you may also need to specify the path to the config file e.g.

  • mosquitto -c c:\mosquitto\mosquitto.conf

You can also use a command line switch -v to enable logging:

mosquitto -v

Running Multiple Mosquitto Brokers

You can configure a broker to listen on several ports, but to create multiple brokers with their own configurations then you will need to start multiple instances of mosquitto. See Quick Guide to the Mosquitto.conf file and this video on running multiple brokers.

Examples:

Start mosquitto and listen on port 1883

mosquitto -p 1883

Start mosquitto as a daemon and listen on port 1884

mosquitto -p 1884 -d

Start mosquitto as a daemon and use the mosquitti-2.conf file. – Windows

mosquitto -c c:\mosquitto\mosquitto-2.conf -d

or Linux

mosquitto -c /etc/mosquitto/mosquitto-2.conf -d

Useful Linux Commands

To stop Mosquitto when running as a daemon:

ps -aux | grep mosquitto
pgrep mosquitto
kill -9 PID (that you get from above command)

Mosquitto Client Scripts

The windows install includes the client scripts, on Linux they need to be installed. Use

  • sudo apt-get install mosquitto-clients

There is a simple subscriber client

mosquitto_sub

and a publisher client

mosquitto_pub

Use

mosquitto_sub –help

They are useful for some quick tests. See Using The Mosquitto_pub and Mosquitto_sub Client Tools- Examples

Notes:

  • I didn’t get the scripts to work on Windows XP -Error not a vaild win32 application
  • On Windows 7 and 10 they gave an error regarding a missing msvcr100.dll file. I found the file on my system and copied it to the Mosquitto directory and they worked OK.

Other Tools

MQTTlensMQTTlens is also very useful for troubleshooting and quick testing. It is an add-on for the chrome browser.

It lets you publish and subscribe to topics using a web interface, and is much easier to use than the command line clients.

Mosquitto Configuration Tutorials

Other Related Articles and Resources:

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16 comments

  1. hi,

    my subscriber is written in golang.
    and i try to install it in windows..
    now i need to install some of the mqtt package which is used in the golang program
    MQTT “git.eclipse.org/gitroot/paho/org.eclipse.paho.mqtt.golang.git”
    _ “github.com/lib/pq”

    how do i do that ?? many thanks

  2. Hi steves
    I followed you and it works correctly.
    Butwhen I stopped mosquitto as below, publish and subscribe work again!!!why?
    code :
    pc@ubuntu:~$ sudo /etc/init.d/mosquitto stop
    [ ok ] Stopping mosquitto (via systemctl): mosquitto.service.

    pc@ubuntu:~$ mosquitto_pub -d -t /topic1 -m myMessage
    Client mosqpub/7237-ubuntu sending CONNECT
    Client mosqpub/7237-ubuntu received CONNACK
    Client mosqpub/7237-ubuntu sending PUBLISH (d0, q0, r0, m1, ‘/topic1’, … (2 bytes))
    Client mosqpub/7237-ubuntu sending DISCONNECT

    mosquitto_sub -d -t /topic1
    Client mosqsub/7104-ubuntu sending CONNECT
    Client mosqsub/7104-ubuntu received CONNACK
    Client mosqsub/7104-ubuntu sending SUBSCRIBE (Mid: 1, Topic: /topic1, QoS: 0)
    Client mosqsub/7104-ubuntu received SUBACK
    Subscribed (mid: 1): 0
    Client mosqsub/7104-ubuntu received PUBLISH (d0, q0, r0, m0, ‘/topic1’, … (2 bytes))
    myMessage

    why???

    1. It doesn’t look like it is being stopped or it may be automatically restarting. Ubuntu installs don’t use the init scripts.
      Try using the sudo service mosquitto stop command.
      You can check using netstat -at command

    2. Thx!
      I tried to install my web server(windows server 2016(64bit) and
      lots of error makes me crazy.
      I spent time almost 12h to catch errors.
      But this articls’s quick install method is only work on my server.

  3. Hi Steve
    in the installation process at the end I get an error called The program can’t start because VCRUNTIME140.dll is missing from your computer. Try reinstall the program to fix this problem

    1. Hi All,
      I had the VCRUNTIME140.dll issue when I install MQTT just now, and I search the issue at web, have a solution it’s Visual C++ Redistributable for Visual Studio 2015 installed, I just download the file and installed, and re-install mosquitto, the problem has been solved, hope the information can help you.

  4. Hi Steve,
    I had almost given up installing mosquitto on windows until I found your tutorial. Success! The zip file was extremely helpful.
    Thanks,
    Carter

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