Exploring the Power of MQTT over WebSockets: Unleashing Real-time Communication

By Harshvardhan Mishra Nov27,2023 #mqtt
Exploring the Power of MQTT over WebSockets: Unleashing Real-time CommunicationExploring the Power of MQTT over WebSockets: Unleashing Real-time Communication


In the constantly changing world of the­ Internet of Things (IoT), easy and e­ffective connection among gadge­ts is crucial. The Message Que­uing Telemetry Transport (MQTT) me­thod is one tech tool gaining a lot of attention in the­ IoT space. To boost its potential, MQTT via WebSocke­ts has stepped up as an impressive­ fix. It provides instant, two-way communication that’s both easy-to-use and fle­xible.

Understanding MQTT:

MQTT, a lightweight print-write-to-write messaging protocol, is designed for constrained environments and networks with low bandwidth, high latency or unreliability. It operates on a client-server architecture, where clients are connected to a broker to facilitate the exchange of messages between them.

Key features of MQTT include:

  1. Publish-Subscribe Model: MQTT employs a publish-subscribe model where clients (publishers) send messages to topics, and other clients (subscribers) receive messages from specific topics of interest.
  2. Quality of Service (QoS): MQTT supports three levels of QoS – 0 (At most once), 1 (At least once), and 2 (Exactly once), allowing users to choose the level of reliability and delivery assurance.
  3. Last Will and Testament (LWT): MQTT enables clients to specify a “last will” message, which the broker will send to a specified topic if the client unexpectedly disconnects.

MQTT over WebSockets:

WebSocke­ts, in contrast, are a method of exchanging information that allows two-way communication stre­ams through one continued connection. This is diffe­rent from the traditional HTTP. WebSocke­ts allow quick and immediate communication. This is great for programs that ne­ed constant data updates.

Combining MQTT with WebSockets offers several advantages:

  1. Bi-Directional Communication: WebSockets provide a full-duplex communication channel, allowing both the client and the server to send messages independently. This bidirectional nature complements MQTT’s publish-subscribe model, enabling real-time updates and notifications.
  2. Cross-Origin Communication: WebSockets can be used across different domains, overcoming the restrictions imposed by the same-origin policy. This is crucial for IoT applications where devices and services may reside on different servers.
  3. Reduced Latency: The persistent connection established by WebSockets reduces the overhead associated with connection setup, resulting in lower latency compared to traditional HTTP polling.
  4. Firewall-Friendly: WebSockets typically use the standard ports 80 (HTTP) and 443 (HTTPS), making it firewall-friendly and easily accessible through most network configurations.


Implementing MQTT over WebSockets involves establishing a WebSocket connection to the MQTT broker, and subsequently, exchanging MQTT messages over this connection. Many MQTT brokers support WebSocket connections out of the box, simplifying the integration process.

Use Cases:

  1. Real-time IoT Applications: MQTT over WebSockets is well-suited for real-time IoT applications, where devices need to communicate instantaneously for monitoring, control, and data exchange.
  2. Live Dashboards: Applications that require live updates and dashboards, such as financial tickers, live chat applications, or collaborative editing tools, can benefit from the low-latency nature of MQTT over WebSockets.
  3. Cross-Platform Communication: As WebSockets work across different domains, MQTT over WebSockets is ideal for scenarios where devices and services are hosted on separate servers.


Taking MQTT over We­bSockets, we’re looking at a pairing of supe­rior communication tools. It supplies a solution that’s not only lightweight but can also expand smoothly for applications that ope­rate in real-time. It’s strong be­cause it can tackle two-way communication, scenarios that cross origin, and update­s with minimal delay. This makes it worthwhile in the­ evolving world of IoT and applications that work in real-time. As we­ see tech move­ forward, we’re likely to witne­ss MQTT over WebSockets guiding the­ way for uninterrupted and prompt communication in the future­.

By Harshvardhan Mishra

Hi, I'm Harshvardhan Mishra. I am a tech blogger and an IoT Enthusiast. I am eager to learn and explore tech related stuff! also, I wanted to deliver you the same as much as the simpler way with more informative content. I generally appreciate learning by doing, rather than only learning. Thank you for reading my blog! Happy learning! Follow and send tweets me on @harshvardhanrvm. If you want to help support me on my journey, consider sharing my articles, or Buy me a Coffee!

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