What is an MQTT Broker Clearly Explained

This video takes a deeper look at MQTT to see what the central server, called the "broker", is capable of. The communication model of MQTT offers a lot of benefits over the traditional poll and response model. In this tutorial we'll take a look at an MQTT broker what advantages it can provide for IoT and IIoT applications.
In this video you will learn:
- How the MQTT model works
- What an MQTT broker is and where it can run
- Useful features and functionality that the broker provides
- Retain Messages
- Birth, Death, and Last Will and Testament Messages
Learn more at
www.opto22.com
mqtt.org/
www.cirrus-link.com/
training.opto22.com/series/gr...
www.opto22.com/products/groov...
All Opto 22 products are designed, manufactured, and supported in the U.S.A. from our Temecula, California headquarters and factory.

[@thomasm1964]

Excellent, calm, measured explanation of the subject. No annoying music. No annoying verbal tics. No annoying, flashy editing. No annoying anything! Just subscribed.

[@adalbertoabade]

best comment. this is how web videos should be, this one is a perfect example by the way.

[@tehuster]

Could not have said it better! Liked & dubbel.

[@rd88elw]

I prefer no music because I watch instructional/educational videos at 3x speed (with an extension). Often with closed captioning too. Music really throws it off.

[@bubblez9266]

I can only agree. Perfect video tutorial! Just subscribed!

[@bubblez9266]

PS, this helped me a lot with my thesis, thank you for that!

[@bguiles1]

This is such a great explanation you barely even notice that the guy starts each sentence in Los Angeles and ends it in Melbourne.

[@abyanfernandez9931]

simple and clear. thank you!

[@SME1432]

Clearly explained indeed..Thank you.

[@PsychedelicGuy1]

That explanation was really good,Thank you

[@user-be2vh6zt9r]

Thank you.Very clear explantion.

[@michaelwest7822]

Thank you for a very clear and concise explanation...Excellent

[@samu350]

Enormous help, so much information yet still comprehensible, thank you!

[@Opto22]

Thanks Samuel!

[@troymclean9301]

My favorite MQTT Broker explanation...I share this weekly with my customers that want to learn more about MQTT. Great job OPTO 22!

[@Opto22]

Glad it was helpful!

[@vvnnable]

really appreciate the way you have made and edited this video, i likes the way you gave tiny sound to each graphics that makes it look it more alive

[@Opto22]

Thanks Vinay! I'm really glad you liked the video. Keep watching.

[@harrysullivan110]

Great video. Love the pace and the clarity.

[@Opto22]

Hi Harry, Keep watching! We've been busy making more tutorial videos.

[@rmatveev]

I'm always liked to watch your videos: your speach is so clear and structured that after I watched any of your tuts - I feel that I'm already an expert on the topic. Thank you for that!!!

[@Opto22]

Thanks!

[@surjist]

This is the clearest explanation to date I have seen and I've been doing IoT since 2004. Going to send it to my students. Love it. So clear, thank you!

[@Opto22]

Awesome, thank you!

[@playaspec]

EXCELLENT video! Just the sort of lower level feature information other videos seem to gloss over. Thanks!

[@Opto22]

Thanks playaspec, Keep watching! We've been busy making more tutorial videos.

[@valtrann745]

Amazing work. Thank you so much. I've never commented before but you can't imagine how helpful your videos are to me as a beginner. I started out with Node-red and have been following your series since then. Keep up the good work.

[@Opto22]

Thanks Ha My Tran! We are so glad that you found it helpful. Keep at it!!

[@jagdishshetty4782]

Great explanation !!! Thx !!!

[@stephenhilton5820]

Thanks. I just came looking for MQTT primer and yours is excellent! Will be checking out your other videos as time permits.

[@Opto22]

Awesome! Thank you!

[@ZackScriven]

This content is so good.

[@Opto22]

Thanks Zack! That means a lot coming from you.

[@hritikdj]

Nice work dude !! Clearly explained each concept, Thank you so much

[@Opto22]

Most welcome!

[@Jukalihaha123]

Keep going with the excellent work that you do.

[@Opto22]

Hi Fernando, We're busy making more MQTT tutorial videos. Keep watching this space! More new videos coming out every week.

[@sarthakvarshney]

Insanely easy to understand video. I understood in a sec. Thanks! Kudos to your work.

[@Opto22]

Glad you liked it!

[@pedro1p0]

what amazing video, 10 minutes of pure informations, congrats

[@Opto22]

Much appreciated!

[@aykarageorge]

Nice and simple explanation, yet covering everything required.

[@Opto22]

Glad it was helpful!

[@ardentdfender4116]

I’ve got to say that even though I’ve seen a few vids on various people explain MQTT in concept explanation that this is by exceedingly far the most thoughtful, concise, contextual and so well explained video in clarity of all the previous videos I’ve seen on this topic. It’s calmly explained as well. I’ve got a much more through understanding also. My next question is there a low cost device and or software that can be used for the MQTT broker in a PLC System? I’ve seen 1-2 Opto Devices, but I’m not sure what you all have for MQTT oriented broker solution.

[@adamwragg12]

Very clear and informative, thanks! 👍

[@Opto22]

Glad you enjoyed it! Thanks for watching

[@ratbagley]

This is a the best explanation of a complex topic. Watching again

[@Opto22]

Thanks so much!

[@gereldynquizora3598]

Very helpful. Thank you!

[@bergaouikais5951]

I have an exam on IoT in few hours, this video helped a lot thank you 5/5

[@rursus8354]

Nice! I can use that for my lecture on MQTT.

[@beatgerber8895]

I rarely comment however I have to tell you what an amazing job you did on this content.

[@orewaminato]

`Clearly Explained` I have ADHD and normally I'd lost my focus in the first couple of minutes but I kept watching this video for 10mins.

[@Opto22]

Great to hear!

[@Danchoys]

Awesome video! Very clear and informative

[@Opto22]

Glad it was helpful!

[@z8ty]

Great video. I needed this. So very well done. Thank you.

[@Opto22]

Glad it was helpful!

[@user-if1xw3dh3b]

first time ever commenting on the video. Excellent explanation, definitely a keeper !

[@Opto22]

Awesome, thank you!

[@stevesfascinations1516]

Thanks for sharing the information. Loved the way you made the video. Thumbs up and subscribed!

[@Opto22]

Awesome, thank you!

[@keslauche1779]

wow this is the best video on KZbin, you helped start my PhD hitting the ground running

[@Opto22]

Great to hear!

[@ovalwingnut]

Now "that" is how you explain a system correctly. OUTSTANDINGLY EXCELLENT :O) Thank you.

[@Opto22]

You're the best!! Thanks for the love!

[@MetTurtle818]

Thanks, really helpful intro. I've been trying to find something like this....easy to listen to and understand

[@Opto22]

Glad it was helpful!

[@farazkhan107]

Thanks for your efforts and quality content. While watching I thought that the video must be about to end because who shares all that for free but I wasn't even halfway into the video. Thanks again. :)

[@Opto22]

So nice of you

[@atmikes1]

Excellent, thanks for sharing !

[@Opto22]

Glad you enjoyed it

[@jakomuya6444]

perfectly explained. welldone for the good work👏👏

[@Opto22]

Thanks and welcome

[@MrWireguy]

Well done. Very clear. No fluff.

[@Opto22]

Glad you liked it!

[@sanderbloem661]

Awesome video! thank you!

[@Opto22]

My pleasure!

[@przd3502]

perfectly explained. Thank you

[@Opto22]

Glad it was helpful!

[@mrgehring2]

outstanding video, super clear explanation

[@Opto22]

Much appreciated!

[@silverian]

Thanks for great explanation!

[@Opto22]

Glad it was helpful!

[@FreestyleTraceur]

This is super helpful, thank you!

[@Opto22]

Glad it was helpful!

[@solidstatecode]

Very valuable video. Thank you.

[@Opto22]

Glad you think so!

[@MMKurdia]

AMAZING VIDEO, Thank you very much.

[@Opto22]

Glad you liked it! Thank you!

[@rasmuslarsson8454]

Brilliant content, thank you.

[@Opto22]

Glad you enjoyed it!

[@harikrishnak3752]

short and straight video nice

[@Opto22]

Thanks!

[@vladimirzz93]

Such a great video, thanks a lot! >

[@Opto22]

Glad you enjoyed it!

[@PeterCogen]

Excellent work !

[@Opto22]

Thanks so much!!!

[@kostyabakay]

Excellent explanation!

[@Opto22]

Glad it was helpful!

[@sanmitram4172]

Awesome video.. 👍🏻👍🏻 Thank you..

[@Opto22]

Thank you too!

[@learningcurve7498]

Nice....Finally a good explanation

[@Opto22]

Thanks for the support!

[@jiangxu3895]

Well explained what I want to know, Thanks!!

[@Opto22]

Glad it was helpful!

[@mohan1519]

pretty cool explanation !! Thanks :)

[@Opto22]

That's awesome - super thanks!

[@or9796]

Nice tutorial.

[@lomeshwasake1298]

Perfect explanation

[@Opto22]

Thanks! You're the best.

[@rickbronx8528]

Amazing again. Thanks

[@Opto22]

Thanks so much!!!

[@fadedream]

You are absolutely awesomeness bud!!

[@Opto22]

You rock!

[@Major7Sharp5]

again! wow! what a nice video! love it!

[@Opto22]

Thanks! You're the best.

[@omarcruz6326]

Great explanation.

[@Opto22]

Glad you liked it

[@Teesbege]

very well explained👍

[@Opto22]

Thank you 😃

[@cowboyskevin8121]

great explanation

[@Opto22]

Glad you think so!

[@16bitdude36]

very well explained

[@Opto22]

Glad you think so!

[@kobertolober]

you made my day

[@Major7Sharp5]

mine, too!

[@bdyt1001]

Very good video, now bookmarked! Came here following references originating from home-assistant.io, which I'm just learning.

[@Opto22]

Glad it was helpful!

[@tusharniras]

Good Stuff! subscribed !

[@Opto22]

Thanks for the sub!

[@jahangirhossain4343]

Excellent .

[@Opto22]

Many thanks!

[@danieldewindt3919]

Thank you verry much.

[@Opto22]

Thanks! Keep watching

[@Max-bw3ov]

i really love your videos and you

[@Opto22]

Thanks Max we really appreciate it.

[@ratbagley]

Well done.

[@Opto22]

Thanks Jeff!

[@Andrew-rc3vh]

You have a star network in your example but a popular thing these days is a mesh network. One main advantage of a mesh is the ability to relay messages and the other advantage is it is decentralised so you can tap into the mesh in an adhoc way, able to send controls from any node to any other node with all nodes identical on the network layer. I wonder if MQTT can be used in a mesh. My interest in it is to control the network over the internet using AWS or similar. This is because most people use a dynamic IP address so it gets around that problem.

[@oswevega2939]

subscribed indeed ! u rock !

[@Opto22]

Thanks so much!

[@Major7Sharp5]

what a nice explanation about brokers and mqtt functionality! great! good work! May i use your the video info (w/the correspondig intelectual property credits) in a document i'm working on? thank you in advance!

[@boolve]

Amazing. Thanks

[@boolve]

Maybe I would like to hear is what type of messages can be send, what type of data?

[@Opto22]

Thank you too!

[@Opto22]

Great suggestion!

[@Deekudla]

Amazing video. Nice explanation. Suppose devices from the factory want to send messages to the cloud where we will deploy the broker? Is it a customers factory server or a cloud server? what is the best practice? High level diagram of real time use case would help

[@usamaajm]

thank you

[@Opto22]

Thanks for watching!

[@alanblyde8502]

Well explained 🇦🇺👍

[@Opto22]

Thanks 👍

[@GregHassler]

Great video. Only question is where is authentication defined? Does each client need a unique uname/pword or can multiple clients share one? If shared, how are clients identified uniquely?

[@airborneworks6103]

Great explanation, we are attempting to use this protocol I have wondered how it works. Can anyone tell me if there are networks of IOT developers here with in the USA that we can post a project to?

[@TheCzemike]

"Premise" is a proposition, a component in a logical argument; "premises" is land, building, or real estate.

[@msmadaram]

have you ever work on android broker such as moquette or something like that ?

[@omar10wahab]

I think some real life implementation for the birth, death and last will messages would be nice to help me understand the purpose a bit better. You have a broad example and I do think the explanations overall and of that was good but I'm having a hard time thinking of the overall use case. Also I was looking into this video regarding trying to learn about mqtt for home assistant and I'm confused how it's not default an mqtt system. I know I don't use topics to send and receive messages but what would using default home assistant communication be called then?

[@alphacoder3822]

wow......seems like he loves his work.

[@Opto22]

Thanks Alpha coder!

[@prashantpatchi]

nice vido!

[@Opto22]

Thanks!

[@altamashjawad6691]

Can you tell what your opening music is, very nice tune!

[@msmadaram]

have you ever work on android broker such as moquette or something like that ? when we have one esp8266 and we want to connet to it with 20 mobile phone what happen? each esp8266 or esp 12e can just have 8 TCP/ UDP connection what's your idea if we have 20 mobile phones and simultaneous they want to connect to one esp publisher? if we run an android broker on one of mobile phones and other connect to it we can connect to esp by one TCP/UDP from broker to esp, is it true? have you ever work on android broker such as moquette or something like that ? and we don't have any cloud on the net!!!!

[@peterking8586]

We developed the Pub-Sub model, which was further developed by IBM & MS.

[@Opto22]

cool

[@aakashbera2652]

Excellent Video to Understand MTTQ. Pls Answer 1 thing I want to ask, which software you use to make this Animation Videos.

[@Opto22]

Thanks for watching! We use Final Cut Pro X, After Effects, Cinema 4D and Premier.

[@aakashbera2652]

@@Opto22 Thank You for Your Reply.

[@JP-vg8vl]

does all mqtt broker supports Retain Messages, Birth, Death, and Last Will and Testament Messages? i am planning to use mosquitto broker and i dont know if it support those functions

[@taison03251970]

So as example, what could be a broker agent, is Amazon AWS a broker?

[@AbhayNayak]

From what i understand, MQTT just requires a network to be made, not the actual internet right? I'm using AWS greengrass and planning to have 2 devices communicate locally over mqtt, what would happen if there is no internet connectivity with the cloud?

[@Opto22]

You are correct. MQTT doesn't require the Internet to work; it only requires a TCP/IP-based network, including private LANs, WANs, and cellular networks.

[@RedPython]

How come the Certificate is optional for a TLS connection, isn’t that a pre requisite ?

[@starlingwatch3921]

I am working on a wrist watch project and need a way to move 1 to 40 Mbyte data files from an Android and iOS mobile device to the watch over Bluetooth Classic. ESP32 drives the watch. Have you seen a solution? -Frank

[@tinybyteworld423]

at 7:04 you say retained messages are just a copy of the most recent message. But cant there be more than one? I could swear the Q in MQTT is for queue... Nice video though!

[@manaswishige3745]

MQTT while connected to 1883 port but at port 8883 it shows the TLS/SSL error. Could you please explain why this happens like that?

[@Opto22]

It might be a network configuration issue -- if the client cannot reach the broker across a given network then you can get connection errors. If the connection is 100% working, I would double check the broker security configuration.

[@andygrichting]

Maybe someone can elaborate on this: a security feature of MQTT apparently is, that devices are not aware of other devices due to the publish/subscribe methodology. But if the broker sends out Birth/death/LWT messages out to other devices, other devices will become aware of other devices and can notify or attempt reboots. That's a contradiction, isn't it?

[@Opto22]

A better way to think of the security feature is that devices are not aware of each other's identity. I may not have your IP address or host name, but if I know what topic you publish your state changes over, I know your status. The topic and message are whatever you choose, they aren't tied to the individual device, so there's some obscurity there. Also, if there are some devices that you *don't* want to know about your status changes, just use the access control list (ACL) to prevent other client user accounts from subscribing to those topics.