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In this lecture, I am going to demonstrate a few examples of clients connecting to the encoded mosquito.

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He's not running on the Raspberry Pi and subscribing and publishing to topics.

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To do that, I'm going to use first the command lines.

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I've got to command line sessions here.

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One is going to be my publisher and the other one is going to be the subscriber.

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So essentially I'll be sending messages from one command line terminal to the other.

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But I am also going to use my ebooks, which is a graphical utility that allows me to do the exact same

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thing, just using a nice user interface like this instead of the command line.

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So whichever one you're more comfortable with, you can go ahead and use is exactly the same as far

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as the inquisitive broker is concerned.

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If you want to use military books, then go to works with Web dot com and Quiddity Buckstone HTML and

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download the version for your operating system just started and I'm going to show you how to set it

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up in this example here.

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I've got one EMCDDA decline connected to my Raspberry Pi full and Quiddity broker and I'm to set up

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another one for my note.

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Read Raspberry Pi or I'm going to put this aside for now because first I want to show you how to use

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the MUSKETT a pub and Muskett a sub.

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Utilities that come with mosquito on the command line.

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So here's a documentation.

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You go to Muskett IT Origi and in the menu and the documentation there is must get a pub.

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This is the publisher and mosquito sub, which is the subscriber.

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You can see they're both very easy to use.

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Now let's say that I want to have a publisher that sends numbers and text to a topic on my note read

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and it broke up.

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And then down here I'm going to set up a subscriber.

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So whatever data I sent via the publisher will be shown by the subscriber or will be propagated by the

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broker to the subscriber to be more correct.

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So let's start with the subscriber first and then I'm going to send messages using the must get a pub

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utility.

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So let's go ahead and subscribe to a topic.

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So that is going to be done via mosquito sub for the subscriber.

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I'm going to use the this switch to give me verbose output, as you can see from the documentation here.

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Let's have a quick look at the.

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She was down here, they give their Bruce right, and then that he switched to subscribe to a specific

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topic, take exploration's for slash test is a topic that I want to subscribe to.

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All right, sir.

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You can see the utility is running and it's going to give me output as soon as a publisher sense something

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to this topic.

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So I'm going to copy this topic and then go up to the top command line terminal and use the publisher

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to publish something.

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So let's go for Mosquito Pub.

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And I just want to pass the test switch and the topic that I want to publish to and then with the M,

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which let's say a message, hello world.

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Like this and there's the message appearing down here, if you have a look at the documentation for

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the publisher, you'll see that it basically has a lot of options that are available.

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But as you can see in this example, you definitely need to include the the topic and then the message

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that you want to pass on.

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Later on, I'm going to show you how to configure the broker so that it requires authentication.

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And there will be passing the authentication username and password through the command line like this

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as well.

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The information that you can send through all the data is arbitrary.

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So like you can put a number, for example, and you will come through or you can have a comma delimited

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file such as one to three.

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Doesn't really matter.

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The muscular broke and its clients are totally agnostic in terms of the kind of data that you are sending

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through.

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So now that you've seen how this can be done in the comment line, I'm also going to show you how to

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do it using the client.

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So I'm going to create a new client.

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Just make this a little bigger.

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So I'm going to create a new client and I'm going to give it a name, Nood.

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Read the name is and does not need to be the same name as the name of the survivor.

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This is just something that sits within the environment of the kitty box client.

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This is the client I.D. the way that by default, this broker works is that every client needs to identify

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itself with a unique I.D..

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Speaking of the type something in here yourself or just let the client pick a totally random client.

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IP for the protocol would choose and quiddity over Tsipi and for the host, this is what is important

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to see node red dot local, which is the domain of the Raspberry Pi information on which my broker is

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running username and password.

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Leave them empty.

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So that's it.

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Let's click on Safe and you can see that the client is immediately connected.

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Now, the first thing that I do is since I've got a subscriber running down here, I'm going to create

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another publisher.

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And publish something like one, two, three to the same topic, and you can see that that appears right

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here, so that demonstrates that it's possible to have multiple publishers and multiple clients all

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connected to the same topic and under the opposite of take the same topic and subscribe to it.

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And the quality of service limit is zero.

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So now we've got another subscriber.

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I've got one subscriber here and another subscriber here.

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And I'll go to a publisher here and just add some more information to my message and send it through.

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And she can see, it appears to both subscribers or the broker forwards the new data to both subscribers,

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even within the maturity environment.

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If I published something else, like a bit of text.

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That message, this this piece of data will be propagated to any subscriber connected to the same topic,

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and this pretty much it with what you know now about the activity, Muskett, a broker, and the clients,

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both publishers and subscribers, you know, enough to be able to continue with this project.

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But since we are talking about mosquito, let's move on to the next election because I want to show

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you some interesting configuration options and also show you how to set a password and username for

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authentication to add a level of security to our application.