Raspberry Pi - Getting started with MQTT

WHAT IS MQTT? MQTT (Message Queue Telemetry Transport) is a simple and ‘lightweight’ way for internet-connected devices to send each other messages. This is important for home-automation because devices need to send messages back and forth like ‘turn on the lights’ or ‘turn off the sprinklers.’ Devices using MQTT communicate by publishing data to topics. MQTT devices subscribe to a topic, and when data is published to that topic it is pushed to all the subscribers.
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[@artbecker5618]

That was unbelievably clear. You did such a great job of presenting this. I am so happy I found this channel. The only clarification I would suggest you make is clarifying that the MQTT test broker is simply that -- for testing purposes only. Thanks for this excellent video.

[@Core-Electronics]

Thanks Art!

[@jeffpollock5243]

Great video! Very clear and easy to understand for the novice. Thank you!

[@aaronmcdonald7540]

Great video - Very clearly explained.

[@petah2521]

amazing video! thanks :D

[@ChristosTatsiopoulos]

Excellent Video!

[@miraalfasasharma7747]

Thank You So Much..! It is clear enough and really helpful.

[@rwahadj]

Thank you for your patinet and wonderful video!

[@ITexpert55]

Excellent! I was trying to listen what you are going to say but unfortunately I can't do that because of the background sound.

[@guillermoalejandrobastianf7330]

Thank u very much sir ! If u have more examples pls post them!

[@haifa6004]

how to install Mosquitto server. it will be great video if you where speaking about Mosquitto installation too. thank you

[@user-xv4id9xx7u]

apt-get install mosquitto. Done. It wasn't so hard, was it?

[@pskasbekar20]

#working perfectly. Thank you man, for sharing this video...

[@abhaypa1211]

this is the best-explained video I got from the search result, thanks Is there way to make an android app to send readings from sensors in the phone to the raspberry pi using MQTT

[@user-oh6yq5xl9u]

hello nice video !! I just have a question i see that you sent a message. But instead of just sending messages i wanna send a text file whose content is something like tem:17 hum:45. So i have to do something with the payload Do you know what i can do about the payload??? when i tried with mosquitto MQTT by giving an f option(as in file) but now i am communicating with the cloud MQTT so i need to know what i could do with the payload!!

[@eliecerecology]

Awesome video!, can you teach us how to secure the whole communication? Thanks!

[@joebro391]

What does one typically used to publish messages to the client? I have a NodeMCU that I could use, but that seems like overkill if I just wanted to monitor a single sensor, or publish a message everytime that I button is pressed, for example. Is there something smaller/cheaper that I could use? Perhaps with only a few I/O pins? I have the original ESP8266 modules (that require AT commands to program), but those seem a bit "obsolete"...

[@AmazingAl3x]

Great video I managed to simulate the message, for a project I need to send an MQTT message from a laser trip wire I created, what code will I need to put in to the laser trip wire script for this to work?

[@akkumarji]

i have cc2650stk sensor(texas blutooth multi sensor) i have connected to raspberry pi 3 B+ but did not get the data required from the sensor is there is way using mqtt that i can recieve my sensor data to raspberry pr?

[@ParvezAlam-tr6zj]

hi, I have connected one raspberry pi zero W with raspberry pi 3b and sending data using MQTT protocol. Further, I want to connect two raspberry pi zero and send both on their data to raspberry 3b. could you help with the code on raspberry 3b

[@malcolmlewis834]

Where is the code for the server that is published to and that the client subscribes to.

[@eriklaken1025]

Thank you, i Little understand the issue.

[@deriandrian2639]

thank you sir, great video. can i ask, how to send picture with mqtt on Rapberry pi ?

[@Fabian-_-]

Mqtt isn't for sending big messages/data. It's for simple short commands, images are way to big

[@msmadaram]

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

[@MrBobWareham]

Please can you make your Pi screen bigger it is hard to see thanks

[@kentthomas1045]

What do I need to transfer pictures with MQTT?

[@yaminbre7911]

thank you for yoursharing...Alloh guide you....

[@rfdave3980]

no video sound only on android tv box

[@fioo_2386]

Hello and thank you for the video it is really good for understanding the basics of mqtt. Though I noticed something. When I run the Client demo using Python3 instead of Python command, it doesn't print the received messages. The publish demo runs the same both ways. Is there an explanation for that?

[@tumenbayarmunkhjargal6677]

watch this www.ev3dev.org/docs/tutorials/sending-and-receiving-messages-with-mqtt/

[@fioo_2386]

thanks, I found the solution though! stackoverflow.com/questions/50139413/paho-mqtt-client-not-working-properly/50140453#50140453

[@ParvezAlam-tr6zj]

@@fioo_2386 what if they are sending a list and on the value of index 0 depends if the values should be printing or not... like on message function in subscriber-side def on_message(client, userdata, msg): a = str(msg.payload) b=a.split(',') #message is in form 1,"Parvez","alam" upload(b) print(a) print(b[0]) if(b[0]==1): print("raspberry1") print(a)

[@ats4fun]

So when i run command ---> sudo pip install paho.mqtt , i am getting error- couldnot find any downloads that satisfy the requirements for paho.mqtt. Please sugegst

[@7lstudios]

Should be package name poho-mqtt

[@ravindrabhatt]

why is connect being done after on_connect and on_message?

[@anthonysylvester740]

on_connect and on_ message are callbacks. Those are just telling the Client object what to do when you actually connect or receive a message. So what happens here is: 1) You connect. 2) The Client will now fire the function you provided for Client.on_connect (in this case 'on_connect'). 3) The on_message will only fire when you receive a message.

[@austonpramodh]

hey, the if command isnt working, whatever i publish it adds b'' to it like if i publish "hey", the program receives as "b'hey'", please help. thank you and your video is really clear for understanding.

[@austonpramodh]

the issue is with the subscriber, or may be with paho library because i tried to receive same message on other clients and it works.

[@austonpramodh]

got it...utf-8 was missing in received message. msg.payload.decode("utf-8")

[@andrejkoman7108]

Nice job, thanks. It solved this problem.

[@aleksalex1479]

How can I install paho.mqtt and run this codefile on ESP8266 ? Is this real? (ESP8266 run on microPython implementation)

[@googleuser6875]

you can indeed. check this video kzbin.info/www/bejne/hpjWeWdpidWkoMU

[@tonyweavers4292]

A great video. I'm going to give this a go. I have to say, I found the background music irritating and off putting!

[@IoTLearner]

Why don't you use Raspberry pi as broker locally...

[@GowriShankerBellu]

You can. Just run "sudo apt-get install mosquitto"