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Why is MQTT important for IoT?

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Before we delve into what MQTT in IoT is, we need to look at the history of MQTT itself. In 1999, IBM employees invented MQTT as a messaging agreement. In its initial report, MQTT helped oil pipeline sensors connect with satellites under the Azure IoT hub.

In the following two time period since its formation, MQTT became the go-to messaging agreement operated by IoT appliances. In 2014, Oasis approved MQTT as an ISO level, thus marking its universal growth as an IoT messaging agreement. Today, MQTT in IoT assists in connecting millions of appliances across numerous industries under the Azure IoT hub.


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How does MQTT work – Message Structure and QoS Levels

MQTT agreements also use a concept called Quality of Service or QoS levels to ensure the circulation of messages even during changeable connections between devices under the Azure IoT hub. In the MQTT agreements, there are three QoS stages:

QoS 0: QoS 0 is called “at most once,” in this stage, the message is sent at most once, without any contract of delivery. This stage is used when connections between devices are stable, and the news is not critical under the Azure IoT hub.

QoS 1: QoS 1 is called “at least once,” in this level, the message is sent consistently until the receiver confirms the delivery. This stage delivers critical messages whose delivery must be guaranteed under the Azure IoT hub.

QoS 2: Also called “exactly once,” the message is sent only once in this level. Approved delivery needs technical coordination between sender and receiver; thus, this stage is more energy-consuming than the other two stages.

Importance of MQTT

MQTT protocol is essentially a lightweight IoT agreement with various importance:

Lightweight and efficient

MQTT protocol needs a minimal amount of code and absorbs significantly low power. The MQTT agreement is thus energy-efficient and easy to deploy for millions of devices under the Azure IoT hub.

Connecting devices during unreliable networks

MQTT in IoT operates QoS stages to ensure approved delivery of messages to receivers, even when connections between devices are unreliable under the Azure IoT hub.

Enabling communication between the Cloud and devices

MQTT agreement for IoT ensures the speedy connection between cloud servers and IoT devices in remote areas.

Last will feature

If an IoT device disconnects unexpectedly, the MQTT protocol utilizes the last will feature to broadcast a vital message to other IoT appliances in the network under the Azure IoT hub.

Extensive programming support

MQTT has considerable support in programming languages such as Python, making it easy for developers to operate under the Azure IoT hub.

Facts about MQTT:


MQTT IoT projects in the automotive sector allow vehicle theft precaution, vehicle monitoring, and remote maintenance of vehicles under the Azure IoT hub.


One of the best MQTT agreements in the IoT example is in the logistics sector. MQTT IoT hubs like Airtel IoT help track freight vehicles and provide real-time alerts for freight safety and movement under the Azure IoT hub.


IoT MQTT panels in the energy sector assist in building a smarter energy grid and optimizing consumer power consumption.

Home automation

IoT dashboards use MQTT to manage home devices instantly with your mobile phones under the Azure IoT hub.

Benefits of MQTT:

The MQTT protocol architecture’s lightweight properties and minimum overhead assist ensure smooth data transmission with low bandwidth and decrease the load on the CPU and RAM.

The competing protocols of MQTT are as follows:

Efficient data transmission and quick to implement due to its being a lightweight protocol;

Low network usage due to minimized data packets;

Efficient distribution of data; 

successful implementation of remote sensing and control;

Fast, efficient message delivery;

It uses small amounts of power, which is suitable for the connected devices; and

Optimize network bandwidth.

How is MQTT used in IoT?

Because MQTT clients are small, they require minimal resources and thus can be used on small microcontrollers, according to MQTT.org. For optimizing network bandwidth, MQTT headers are small. Plus, MQTT “can scale to connect with millions of IoT devices,” according to the organization under the Azure IoT hub.

As a result, MQTT is one of the most commonly used protocols in IoT and IIoT infrastructure – for example, for utility industries to efficiently transmit data between their services and their customers and devices.

Examples of MQTT use in IoT are as follows:

Smart metering

The MQTT protocol can transmit data with guaranteed message delivery to provide accurate meter readings in real-time. It helps make billing more accurate under the Azure IoT hub.

Gathering ambient sensor data

Sensors in remote environments are often low-power devices, so MQTT is a good fit for IoT sensor buildouts with lower-priority data transmission needs under the Azure IoT hub.

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Billing systems

MQTT helps eliminate duplicate or lost message packets in billing or invoicing under the Azure IoT hub.

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