Nowadays IoT is a buzzword, It is all about making various consumer electronics devices smarter by connecting them to the internet and to the cloud services.
MQTT (invented in 1999) is designed for connections with remote locations where the network bandwidth is limited. It’s purpose is to provide a protocol, which is bandwidth-efficient and uses little battery consumption.
In brief, MQTT is one of the popular Messaging protocols on the top of the TCP/IP protocol. Abbreviation of MQTT is Message Queuing Telemetry Transport. To understand the Concept of MQTT we need to understand the following terms:
1) Publish/Subscribe: It is a protocol where one device can publish a message, another device can subscribe to topics to receive the messages.
2) Messages: Messages are information exchanges between devices, It could be command or data.
3) Topic: A topic, which is the place a device wants to put or retrieve a message to/from.
4) Broker: Broker is responsible for receiving all the messages, Filtering the messages and publishing the messages to all subscribed clients.
Well, if want to explore the top IoT communication protocols that may fit for various power and range requirements!Click here
How MQTT works
As mentioned above, MQTT is designed as a lightweight messaging protocol that uses publish/subscribe operations to exchange data between clients and the server.
It is most suitable protocol for home automation and internet of things projects. If you want to start making your own projects using MQTT; here’s how it should be implemented into four stages:
Connection: A client starts by creating a Transmission Control Protocol/Internet Protocol (TCP/IP) connection to the broker by using either a standard port or a custom port defined by the broker’s operators.
Authentication: Authentication is part of the transport and provides application-level security. With Transport Layer Security (TLS), the successful validation of a client certificate is used to authenticate the client to the server. On the application level, the MQTT protocol enables a username and password for authentication.
Communication: During the communication phase, a client can perform publish, subscribe, unsubscribe and ping operations. Typically messages have payloads. It is up to the developers to define the payloads it could be binary data, Plain text, JSON, XML or something else. There are a couple of other attributes of MQTT messages: Quality of services and retaining the flag.
Termination: When a publisher or subscriber wants to terminate an MQTT session, it sends a DISCONNECT message to the broker and then closes the connection. This is referred as a graceful shutdown because it gives the client the ability to easily reconnect by providing its client identity and resuming where it left off.
Do you have home automation or other IoT project requirement?
We help you build the most efficient solution.
The Benefits of MQTT
● Lightweight code footprint: Devices need only a few lines of code in order to get up and running with the MQTT protocol.
● Minimized data packets: MQTT is very energy-efficient. This makes it great for connection with devices that is battery-powered or has little CPU power.
● Speed: MQTT operates in real-time, with no delays outside of QoS.
● Ease of implementation: MQTT already has libraries in programming languages such as Elixir and Python.
● Last will and testament: If a client unexpectedly disconnects, you can set message instructions to be sent to all subscribers in order to remedy the situation.
● Retained messages: Each topic can have one retained message that a client automatically receives when it subscribes (like a pinned post on social media).
Being an IoT development company at Hashstudioz we are using MQTT protocol in the device to device communication. One of example project explained as:
Monitoring of Smart Socket/Plug connected devices: —
Smart Home Products which makes it easy to control lights and appliances using a tap of mobile. The main appeal behind the solution is its ability to connect to home wireless networks. While the smart Plug and switch can be controlled like any other traditional switch and tap its face to turn a light on or off, it can also be controlled through a mobile app.
Technology used for cloud application were as:
1) Node.Js Back end
3) React.js Front end
4) Mosca was used as node.js based MQTT broker.
5) ESP-12 Wi-Fi module based on core processor ESP8266
6) Relays to turn on/off
This is all about What is MQTT and how can you use MQTT for connection with internet of things.
Frequently Asked Questions
Q. How is MQTT used in IoT?
A. Use in IoT is simple if you follow the steps mentioned above. No wonder this is why MQTT is one of the most commonly used protocols in IoT projects. It uses publish/subscribe operations to exchange data between MQTT clients and the MQTT server.
Q. How do I connect my Internet to IoT?
A. There are various ways to connect internet to IoT. That further depends on the role of the device as mentioned in the options below:
- you need to access this device only on the home / business network.
- The device only connects to a remote server.
- You need to access the device from the Internet using a Static Public IP Address
- you need to access the device from the Internet using a Dynamic Public IP Address
Now according to the role, the connection set to establish. That we will cover in our upcoming blog.
Q. Can MQTT work without Internet?
A. Yes, MQTT may work without internet. See, it only need an IP network because it uses TCP/IP for communication between the subscriber or publisher and the broker. An IP network doesn’t mean you need the internet access. Two devices and one ethernet cable makes a network. That’s it!!
Q. What is the difference between MQTT and HTTP?
A. MQTT is different from HTTP.
- MQTT is a data centric protocol whereas HTTP is document-centric protocol.
- HTTP is request-response protocol for client-server computing and not always optimized for mobile devices, while MQTT publish/subscribe model provides reliability of the whole system.
- MQTT is faster than HTTP.
Q. Is MQTT UDP or TCP?
A. You may say it use both. It relies on the TCP protocol for data transmission. A variant, SN, is used over other transports such as Bluetooth or UDP.
At HashStudioz we have done projects on home automation system, industrial automation and various smart devices sensors.
I can be connected at Jitender.email@example.com. Please feel free to connect to discuss further on MQTT and IOT projects.