MicroPython - MQTT tutorial on ESP32

What if you want to remote control a drone, or create a smart home lighting system, or collect sensor data from many devices? Enter MQTT: a robust and flexible IoT protocol that lets us do all that and more!

0:00 Intro
0:56 MQTT Architecture
3:18 Installing mosquitto
4:58 Configuring mosquitto
7:11 Publish & subscribe
9:16 ESP32 hardware setup
10:04 Select ESP32 in Thonny
11:15 Connect ESP32 to WiFi
11:51 Connect to MQTT broker
15:33 Publish from ESP32
20:27 Button publish demo
21:34 Subscribe from ESP32
26:39 Subscription callback demo
28:03 Set up second ESP32
29:11 Final project demo
30:10 MQTT benefits
30:56 Join for more MicroPython!

[unrealcompanymusic]

really helped me to create an LED smart light for my room! Great going Bhavesh, more more more

[premprasad]

Hi Bhavesh, thanks a lo for your tutorials and in particular for responding to my request with detailed answers. I followed your advice to use a usb serial adapter for the uart port and finally managed to get the data flowing over the serial port. Thanks a lot

[premprasad]

You are so good ; I really hope you will have 10 million subscribers soon

[benedwards]

Hello from Australia, i have a question. I am working on micropython code for an esp32, it has 4x ds18b20 temp probes, each publishing temps to my mqtt broker on 4x topics. I have a node red handling thermostat duties, publishing either a 1 or zero to the mqtt broker on topics relay1, relay2, relay3 and relay4. The question is, can the esp32 subscribe to all 4 topics and then control 4 gpio outputs for my relay board?

[laurentstrodiot]

Congratulations for your video !!! This is great quality and I have learned a lot about using mqtt with micropython. I have a micropython project with neopixel matrix connected to esp8266 (connected to wifi) and I was wondering if the same protocol could be used to send json files or arrays ? Many thanks and looking forward to your next video. best.

[case]

Great video man keep it up! Question for you can you run the broker off a 3rd esp32 as well?

[premprasad]

How to send data from micropython on esp32 to python running on pc using pyserial module ? And vice versa ?

Can you do this quickly plesae ? I tried . It works on arduino, on microbit but not when esp32 is running micropython !!

[mansurbhamani]

I tried it on Raspberry Pi PICO temperature measurement, it works. But if broker goes offline then PICO does not connect back to the broker. What could be the solution?

[safwanshaib]

Nice work 👏
I was trying to use AWS broker online but have been having issues with building the connection, especially the certificate and private key. It would very helpful if I could connect to an online IOT cloud.

[omerberkaykaynar]

great but i want to redirect remotely.
for example: I want to know the temperature in my house from my workplace. how can do this? your current local connection

[DJNilu]

lol 10 million subscribers! ....in binary