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In this lesson, we are going to introduce what is QCT protocol and why we need it.

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I'm here to protocol stands for message queen telemetry transport.

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Now it's a lightweight messaging protocol for small sensors and mobile devices optimized for high latency

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or unreliable networks, enabling a smarter projects and devices.

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And nudity is a simple messaging protocol.

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It's designed for constrained devices with low bandwidth.

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So it's the perfect solution for Internet of Things applications.

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And security allows you to send commands to control outputs, read and publish data from sensor loads

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and much more.

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Therefore, it makes it really easy to establish a communication between multiple devices.

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If you like home automation and you want to build a complete home automation system, you can easily

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do that using security.

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Now.

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In order to use NQT, you need to know that man commands.

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And these are publish messages, topics and brokers.

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Now let's start with the main concept of publish.

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The first concept is to publish and subscribe system and publish unsubscribe system advice can publish

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our message on our topic.

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Or it can be subscribed to a particular topic to receive messages so it can send a team to Charleston

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sort of value to a specific topic online.

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While the messages, which is a second concept, all of the information that you want to exchange between

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your devices, whether it's a command or debt.

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The third concept here is that topics it's another important concept.

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Topics are the way you register interest for incoming messages or how you specify where you want to

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publish that message.

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Topics are presented with strings separated by a forward slash.

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Each forward slash indicates atomic level, and you can easily take this as an example, if we added.

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I'll see you.

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And a forward slash, it means that we have this topic, if we add ESB after, that means that you are

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specifying another topic inside this one.

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So this is the main topic and this is the sub one, and we can't keep going like that.

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Now the Foxconn concept here is the broadcast.

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You also need to be aware of that.

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The broker is primarily responsible for receiving all messages, filtering their messages, decide who

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is interested in them and then publishing the message to all subscribed clients.

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So it's a very important concept when it comes to multi level and multi devices systems, but mainly

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we will use the publish.

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Concept, and we will publish data to that NQT online servers from the ISP, Bolt and ISP will receive

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the data from our Arduino board.

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That's it.

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This is the main concept.

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This is what is.

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I'm Kutty why it's important to use it.

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You can replace it with any other API like Google Firebase.

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Any other API can work, but you need some coding experience to adjust the code.

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Thanks for watching this.

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That's all.

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This is us far from educational engineering team.