DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
Please enter at least three characters to search
Refcards Trend Reports
Events Video Library
Refcards
Trend Reports

Events

View Events Video Library

Zones

Culture and Methodologies Agile Career Development Methodologies Team Management
Data Engineering AI/ML Big Data Data Databases IoT
Software Design and Architecture Cloud Architecture Containers Integration Microservices Performance Security
Coding Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Culture and Methodologies
Agile Career Development Methodologies Team Management
Data Engineering
AI/ML Big Data Data Databases IoT
Software Design and Architecture
Cloud Architecture Containers Integration Microservices Performance Security
Coding
Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance
Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks

Last call! Secure your stack and shape the future! Help dev teams across the globe navigate their software supply chain security challenges.

Modernize your data layer. Learn how to design cloud-native database architectures to meet the evolving demands of AI and GenAI workloads.

Releasing software shouldn't be stressful or risky. Learn how to leverage progressive delivery techniques to ensure safer deployments.

Avoid machine learning mistakes and boost model performance! Discover key ML patterns, anti-patterns, data strategies, and more.

Related

  • OPC-UA and MQTT: A Guide to Protocols, Python Implementations
  • Real-Time Communication Protocols: A Developer's Guide With JavaScript
  • Most Popular Telegraf Input Plugins and Integrations With InfluxDB
  • Connecting the Dots: Unraveling IoT Standards and Protocols

Trending

  • Java's Quiet Revolution: Thriving in the Serverless Kubernetes Era
  • Fixing Common Oracle Database Problems
  • Virtual Threads: A Game-Changer for Concurrency
  • Enhancing Avro With Semantic Metadata Using Logical Types
  1. DZone
  2. Data Engineering
  3. IoT
  4. 3 Tools to Simulate an MQTT Client

3 Tools to Simulate an MQTT Client

When it comes to handling MQTT messages, here are a few tools that will help you simulate clients to mimic pub-sub messaging transport.

By 
Maria Hernandez user avatar
Maria Hernandez
·
Jul. 17, 17 · Review
Likes (1)
Comment
Save
Tweet
Share
55.7K Views

Join the DZone community and get the full member experience.

Join For Free

MQTT is an Internet of Things connectivity protocol, designed as an extremely lightweight publish/subscribe messaging transport. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.

MQTT is especially useful to push data to your devices. Imagine a cloud-controlled device to open/close a door remotely. In the case of HTTP, the device would have to continuously make GET requests to the server to see if there’s a change in a variable, say “Door Control Variable”, and then make an action depending on the last reading. This takes a lot of requests and is inefficient because it depends on the polling frequency. With MQTT, the device can “listen” to the cloud and only be notified when there’s a change in the variable. This way, the connection between the device and the cloud is left open but data travels only when necessary, saving battery, network bandwidth, and improving the real-time capabilities.

The Top Three

In this protocol, the central communication point is the MQTT broker. It is in charge of managing all messages between the senders and the receivers. To interact with an MQTT broker, you’ll need an MQTT client, which is the one in charge of publishing/subscribing messages to the broker. The MQTT client includes a topic into the message. It is in charge of routing the information to the MQTT broker.

Nowadays, there are many tools that let you simulate MQTT clients without using any hardware. You need only establish the communication between the MQTT broker and the MQTT client! Below you will find Ubidots top 3 tools for simulating MQTT requests.

1. MQTTLens

This tool can be installed via the Google Chrome Web Store with just one click, making it easy and convenient to get started. MQTTLens connects to an MQTT broker and is able to publish and subscribe to MQTT topics using an interface that's simple and easy to grasp, making it one of the most common in the world.

MQTTLens allows connections to more than one broker at the same time, supporting all the available connections option from the MQTT spec, though not persistent sessions. A cool feature is the display of JSON payloads. They're presented in a nice way and can easily be understood.

MQTTLens is particularly well-suited for people who need basic pub/sub functionality without having power needs.

To get a better an idea how its works, you can reference to this video tutorial:


2.  MQTT.fx (Available for Win/MacOSX/Linux)

MQTT.fx (or here) is an MQTT client written in Java and based on Eclipse Paho. Due to the native packaging available for JavaFX, there are binaries for Windows, MacOSX, and Linux, which makes the installation a breeze. MQTT.fx aims to be a quick and easy-to-use desktop tool for MQTT debugging and testing.

This tool supports importing/exporting Topics and Clipboard messages. Furthermore, the standard publish/subscribe functionality provides support for $SYS topics and connection profiles for connecting to different brokers. The connection profiles allow the configuration of connection options like client id, SSL/TLS, username/password, and Last Will and Testament. Also, MQTT.fx lets you view publisher and subscriber at the same time by detaching one of the tabs.

3. MQTT-Spy (Based on Java 8)

MQTT-Spy (GitHub) has a very nice way to display basic MQTT publish/subscribe mechanisms. Having different tabs for connections to several brokers, it makes it easy to publish and subscribe at the same time!

The areas of the pub/sub window are: publish, new subscription, subscription, and messages. These can be closed to make room for currently operational windows. MQTT-Spy also comes with advanced features like scripting, filtering, searching, decoding and formatting on received messages, and graphing/charts. 

Another handy feature is that it logs every published and received message in the standard output into a file for simple access. It is easy to open the file in any text editor and make a deeper analysis of the messages, which is often necessary when dealing with many MQTT messages.

Tools to Simulate an MQTT Client

Now that you have the tools needed it to simulate an MQTT client, you can test with the Ubidots' MQTT broker. Please reference the MQTT API reference for additional information on subscribing and publishing requests.

There are a number of tools to publish or subscribe on MQTT topics, which make this easier, but these top 3 will help you start working with MQTT! Reference to the official MQTT website where you can find a list of these tools and more exploration.

MQTT

Published at DZone with permission of Maria Hernandez, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

Related

  • OPC-UA and MQTT: A Guide to Protocols, Python Implementations
  • Real-Time Communication Protocols: A Developer's Guide With JavaScript
  • Most Popular Telegraf Input Plugins and Integrations With InfluxDB
  • Connecting the Dots: Unraveling IoT Standards and Protocols

Partner Resources

×

Comments
Oops! Something Went Wrong

The likes didn't load as expected. Please refresh the page and try again.

ABOUT US

  • About DZone
  • Support and feedback
  • Community research
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Core Program
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 3343 Perimeter Hill Drive
  • Suite 100
  • Nashville, TN 37211
  • support@dzone.com

Let's be friends:

Likes
There are no likes...yet! 👀
Be the first to like this post!
It looks like you're not logged in.
Sign in to see who liked this post!