How to test the Mosquitto server

Question

I am new to Mosquitto and MQTT  I downloaded the Mosquitto server library but I do not know how to  test it   Is there any way to test the Mosquitto server

User · Accepted Answer

In separate terminal windows do the following:

Start the broker:
```
mosquitto
```
Start the command line subscriber:
```
mosquitto_sub -v -t 'test/topic'
```
Publish test message with the command line publisher:
```
mosquitto_pub -t 'test/topic' -m 'helloWorld'
```

As well as seeing both the subscriber and publisher connection messages in the broker terminal the following should be printed in the subscriber terminal:

test/topic helloWorld

User · Answer

To test and see if you can access your MQTT server from outside world  outside of your VM or local machine   you can install one of the MQTT publishing and monitoring tools such as MQTT-Spy on your outside-world machine and then subscribe for      meaning all the topics    You can follow this by the method  hardillb mentioned in his answer above and test back and forth such as this   On the machine with Mosquitto Server running    On the outside-word machine with mqtt-spy running    I have mainly mentioned mqtt-spy since it s multi-platform and easy to use  You can go with any other tool really   And also to my knowledge to run the mosquitto sub and mosquitto pub you need to have mosquitto-clients installed on your Linux machine running the test  in my case Ubuntu  which can be done easily by   sudo apt-get install mosquitto-clients

User · Answer

If you are using Windows  open up a command prompt and type  netstat -an     If your server is running  you should be able to see the port 1883     If you cannot go to Task Manager   Services and start restart the Mosquitto server from there  If you cannot find it here too  your installation of Mosquitto has not been successful    A more detailed tutorial for setting up Mosquitto with Windows   is linked here

User · Answer

The OP has not defined the scope of testing  however  simple  gross   smoke testing  an install should be performed before any time is invested with functionality testing   How to test if application is installed   smoke-test    Log into the mosquitto server s command line and type    mosquitto   If mosquitto is installed the machine will return    mosquitto version 1 4 8  build date Wed  date of installation  starting  Using default config   Opening ipv4 listen socket on port 1883

User · Answer

If you wish to have an GUI based broker testing without installing any tool you can use Hive Mqtt web socket for testing your Mosquitto server just visit http   www hivemq com demos websocket-client  and enter server connection details  If you got connected means your server is configured properly  You can also test publish and subscribe of messages using this mqtt web socket

User · Answer

Start the Mosquitto Broker  Open the terminal and type   mosquitto sub -h 127 0 0 1 -t topic  Open another terminal and type  mosquitto pub -h 127 0 0 1 -t topic -m  Hello   Now you can switch to the previous terminal and there you can able to see the  Hello  Message One terminal acts as publisher and another one subscriber

[mqtt] How to test the `Mosquitto` server?

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