MQTT- Meaning, Pros & Challenges

The major problem of Azure IoT hub is connecting billions of devices and enabling information exchange between them. Since most IoT devices lack sufficient computing power, Azure IoT developers are always searching for lightweight and low-power connection protocols. One of the most widely used IoT messaging protocols is MQTT. Message Queue Telemetry Transport is referred to as MQTT. The technology has been around for over 20 years and is frequently used in many communication networks. One of this protocol’s most common application areas is the Internet of Things. Here, we’ll go over MQTT and how it’s used in Azure IoT applications.

What is MQTT?

Intelligent sensors, wearables, and other Azure IoT gadgets frequently need to send and receive data via a network with finite resources and bandwidth. These IoT devices utilize MQTT for data transfer because it is simple to set up and effective in exchanging IoT data. Machine-to-machine communication is governed by the standards-based messaging protocol, or collection of rules, known as MQTT. MQTT enables communication from devices to the cloud and from the cloud to the device. MQTT is a widely used technology that was first employed to create connections inside a satellite network.

MQTT’s resource efficiency, enabled by the system’s use of the pricey satellite link, was crucial. Later, the Internet of Things and other application areas, as well as more accessible and affordable communication routes, adopted MQTT (IoT).

What is the Use Of MQTT in IoTs?

An Internet of Things system is a network of interconnected devices. No matter how many devices there are, it makes device interaction efficient. MQTT works nicely with this idea. It has a quick reaction time and is a lightweight protocol.

  • The MQTT protocol architecture’s little overhead is a desirable characteristic. Low bandwidth data transport is guaranteed, and the CPU and RAM aren’t.
  • Our adaptable GPS tracking system utilizes MQTT as a lightweight and energy-efficient communication protocol. In this Internet of Things project, a GPS tracker gathers beacon data, delivers it to the cloud, and displays it in real-time on the front end. For a compact, power-efficient device, MQTT was a good choice.
  • Even with unsteady connections, the IoT protocol MQTT can send data. The Quality of Service (QoS), which is in charge of message delivery, offers three alternatives. Data importance and connection stability determine which option should be chosen.
  • The MQTT protocol may be implemented in any context, using pre-made or bespoke libraries, thanks to freely accessible documentation and a sizable development community.
  • You require a library and a broker, either your local server or one hosted in the cloud, to implement the MQTT protocol for IoT devices. The environment and development tools that are chosen will affect the deployment cost.

Advantages of MQTT Protocol

The MQTT protocol has the following advantages, which have led to it becoming a standard for IoT data transmission:

  • Lightweight Protocol

MQTT implementation on IoT devices is resource-lightweight and practical, allowing for usage on even tiny microcontrollers. Additionally, MQTT message headers are compact to maximize network capacity. For instance, a simple MQTT control message can include two data bytes.

  • Scalable

A small amount of code and relatively little electricity are needed for a scalable MQTT implementation. Additionally, the protocol has capabilities that enable connection with many IoT devices. Consequently, you can use the MQTT protocol to establish relationships with many of these devices.

  • Reliable

Many Internet of Things (IoT) devices communicate via unstable cellular networks with high latency and little capacity. The IoT device can connect to the cloud more quickly because of MQTT’s built-in functionalities.

  • Secure

Developers can quickly encrypt messages and authenticate users and devices using authentication protocols like OAuth, TLS1.3, customer-managed certificates, and more, thanks to Secure MQTT.

  • Well-supported

Several languages, including Python, widely supports the MQTT protocol implementation. As a result, programmers may easily apply it with little to no code in any application.

Challenges of MQTT

MQTT might only sometimes be the best option, though. The procedure has several shortcomings, including:

  • Slower transmit less rapid share cycles in comparison to Constrained Application Protocol (CoAP). For systems with more than 250 devices, quick processes are essential.
  • Finding Resources: A flexible topic subscription system underlies MQTT’s operation. CoAP uses a reliable resource discovery system.
  • Insufficient encryption for security: Despite using TLS/SSL (Transport Layer Security/Secure Sockets Layer), MQTT is mostly an unencrypted protocol.
  • Scalability: With an MQTT protocol compared to rivals, building a worldwide scalable network is more challenging.


Although it could be better at all points, MQTT is a fierce rival in data transport and network communication. The IoT community is very supportive of MQTT. With a rising number of tiny, inexpensive, and low-power products hitting the market, MQTT’s straightforward internet of things architecture—which builds on the TCP/IP protocol—has revolutionized the industry. MQTT does have certain restrictions, though. In light of this, we’ll examine the advantages and disadvantages of utilizing MQTT for IoT, a possible substitute, and if it’s the best IoT protocol for your IoT stack.