MQTT Protocol with NodeMCU ESP8266 Tutorial 

Hi Ibrahim Glad it was helpful! Thank you!

Thank you Ravindra! I hope you enjoyed this video. Good luck and best wishes!

Hi Cptnbond, Awesome, thank you! I hope you enjoyed this MQTT with ESP8266 Tutorial. Have a good day. Best wishes!

Thanks! I hope you learned how to use MQTT on ESP8266 NodeMCU. I'll be making more advance videos on the same topics.

Hi Treesa, Glad it was helpful! Best wishes!

Hi Briju, Thanks a lot! I'll be making more videos on MQTT and other IOT topics in days to come. Best wishes!

Hi Mr. Bob, thank you! I'm glad that you found this ESP3266 MQTT tutorial useful. Wish you a beautiful day!

You're welcome!

Thank you very much for your kind words. Now coming back to your question. I understand writing WiFi credentials in code is not good practice while building product. So you can use internal memory of ESP8266 Microcontroller and via webserver you can let user to change WiFi credentials as and when needed. This is exact mechanism is used even in our internet router. I hope this answers your question. Thanks again!

Awesome, thank you Michael!

Thank you Shivprakash!

You're welcome

this is so detailed u could honestly just ask gpt Your project sounds ambitious and well thought-out. I'll try to provide insights on both of your questions: ### 1. Utilizing the Mesh Network: Using a mesh network for NodeMCU devices can greatly expand the range and reliability of your home automation system. Here's how you can effectively utilize it: - **Central Node**: Designate one NodeMCU as the central node (often referred to as the master node). This node will be the primary communication point with the Home Assistant operating system and any other external systems. - **Message Protocol**: Implement a standardized message protocol. This should define messages for controlling relays, reading sensor values, health checks, etc. Each message should have a unique identifier, source and destination addresses, action type, and any associated parameters. - **Routing and Addressing**: Ensure that each NodeMCU in the mesh has a unique address. The central node should maintain a routing table that keeps track of the best path to each NodeMCU in the network. - **Health Checks and Redundancy**: Implement regular health check messages to ensure each node is functional. If a node fails to respond, the central node should attempt to find an alternative route to it through the mesh. - **Data Aggregation**: Since you're planning to store sensor values in InfluxDB, consider sending aggregated sensor values at regular intervals (e.g., every minute) instead of real-time updates to reduce network traffic and database writes. ### 2. Integrating MQTT: MQTT is a lightweight messaging protocol designed for low-bandwidth, high-latency, or unreliable networks. Here's how you can integrate it: - **Broker**: Use an MQTT broker like Mosquitto. This will act as the central hub for all MQTT communications. Install it on a server or a Raspberry Pi. - **Topic Structure**: Use a well-defined topic structure. For example: `home/room1/light`, `home/room2/fan`, etc. Use sub-topics for commands (`set`) and state (`status`), e.g., `home/room1/light/set` and `home/room1/light/status`. - **Publishing & Subscribing**: - NodeMCU devices should subscribe to the relevant command topics (e.g., `home/room1/light/set`) to listen for relay control messages. - They should publish sensor readings and relay statuses to their respective status topics (e.g., `home/room1/light/status`). - **QoS Levels**: MQTT has different Quality of Service (QoS) levels. For critical commands, consider using QoS level 1 (message is delivered at least once) or 2 (message is delivered exactly once). - **Retained Messages**: Use the "retain" feature of MQTT for the status topics. This ensures that the last known state of each device is always available to new subscribers or after a disconnection. - **Integrate with Home Assistant**: Home Assistant has built-in support for MQTT. You can define MQTT entities in Home Assistant, and it will automatically subscribe to the relevant topics and control devices accordingly. - **Secure the Communication**: Ensure to enable authentication on your MQTT broker. Consider using SSL/TLS to encrypt the communication between the broker and the clients. - **Feedback Loop**: When a command is sent to a NodeMCU device to change the state of a relay (like turning a light on), the NodeMCU should acknowledge the receipt of this command by updating the status topic. This ensures synchronization between the control interface and the actual state of the devices. Remember to test each component of your system in isolation before integrating everything. This will help you pinpoint issues more easily. Good luck with your project!

Glad it was helpful!

maybe for you if you are Indians, but honestly this guy's English is very difficult to understand

Hi Ram, you can do this by setting QoS which means Quality of Service when using Publish and Subscribe function of MQTT Library in ESP8266 Code. I hope this may help you. I'll consider making dedicated video on similar topic in future. Thanks for your input.

Yes, There we've made an object named "client" using class defined in PubSubClient library header file in Arduino code of NodeMCU ESP8266. Please note that this line made NodeMCU as an MQTT client to connect to Server. I hope this may help you. Good luck and best wishes!

Thanks for the visit

Hi, the basic MQTT server by mosquitto is free to use and no need to signup. But its possible there maybe some services could be paid. I usually use and deploy my own MQTT server for commercial projects. I hope this answer can help you. Good luck and best wishes!

Yes, its possible because the MQTT server used in this example is Public MQTT Server.

Hi Bhupender, consider smart home automation. where you can use protocols like MQTT, Zigbee etc. And also most common NodeMCU ESP8266 good choice to keep things simple in project. I wish you good luck and best wishes!

Hi Midhul, yes its possible as MQTT server will be public any number of mobile can able to connect and show sensor data. Good luck and best wishes!

Hi Kamal, It can be done. You need to use MQTT protocol with SIM800C GSM Module. Good luck and best wishes!

Hi Muaadmami, MQTTLens is no longer maintained by its developer. So you can't download anymore in chrome. Please check my "MQTT Explorer" Client video on BinaryUpdates channel. It's good alternative. I'll be using it in my future MQTT video lessons. I hope you'll find my MQTT Explorer video on channel. Good luck and best wishes!

Sure, we'll make dedicated video to publish analog sensor data to publish over MQTT protocol with ESP8266 NodeMCU. Thanks for your suggestions. Good day!

@@BINARYUPDATES Thank you.

Hi Syed, temperature sensor LM35 input is connected to A0 Pin which is Analog Pin of ESp8266 NodeMCU. Best Wishes!

It's not necessary to have Mobile and ESP32 to be in the same network. Since the MQTT server is public server you can control from any mobile other mobile connected with any other network.

If in case its not working put "test.mosquitto.org" in place of IP address in Arduino code as well as MQTT Client like MQTTLens and Mobile App. As the broker/server is free sometimes they may change ip address every now and then...Let me know if it solve the issue. Good luck and best wishes!

Hi Segar, you need to explore deep sleep mode of ESP32 Microcontroller. I'll surely consider making video in future. Thanks and best wishes!

Hi Batir, thank you! as per your comment. I feel MQTT server is fine as it is working with with mobile app and computer. I guess the issue is seems to be with ESP8266 NodeMCU is not connecting to WiFi for some reason. I think please re confirm you've not made any spelling mistake while writing ssid and password in your Arduino program that uploaded on ESP8266. I hope this may help you somehow. Good luck and best wishes!

Hi Kimberly The LED is connected to GPIO2 Pin which is D4 Pin on NodeMCU ESP8266. Usually, all board comes with built-in led connected to NodeMCU on the same pin. I hope this may help you Good luck and best wishes!

DS18B20? wondering it can work without R pull up?

Its LM35 analog temperature sensor from Texas Instruments been used with NodeMCU ESP8266 for MQTT Example project.

Yes, you can use MQTT Protocol with ESP32

Hi Dashinkumar, this MQTT server used in example project in public and free to use. So no need to activate. You just have to configure MQTT Client like MQTTExplorer or MQMQTT App with server as shown in video. If server and port information is correct then client means Mobile/Desktop App will connect to MQTT server. I hope this may help. Good luck and best wishes!

Hi Deekhit, I'd suggest to use "MQTT Explorer" instead of "MQTTLens". I just have made video on how to publish and subscribe MQTT messages using MQTT Explorer. Unfortunately, MQTTLens no longer provide update or support. So, it's advisable to migrate or use MQTT Explorer. Just check video on BinaryUpdates channel. I hope you'll find this useful. Good luck and Best wishes!

Hi Sehan, To control multiple LEDs, we need to add more MQTT Topics and Payloads to control individual devices. I'll consider making similar video in future. Thanks!

@@BINARYUPDATES thanks it will be very important video

Hi Muhammad, please check my latest MQTT Explorer tutorial. Search MQTT Explorer BinaryUpdates and you'll find it on my channel. As MQTT Lens is no longer maintained by its publisher so chrome doesn't support anymore. I hope my new video will find helpful to you. Good luck and best wishes!

Hi Jeevan, MQTTLens no longer available. So I recommend using MQTTExplorer insted of it. I have a dedicated video on how to use MQTTExplorer to publish and subscribe MQTT messages. I hope you'll find the video on our channel. Good luck and best wishes!

@@BINARYUPDATES yes i saw that video.

Please try with "test.mosquitto.org" instead of IP address number in Arduino Code and MQTT Client Application.

Hi I used the code provided from MQTT example project of ESP8266 Arduino library. You can do open project file as like I've shown in video lesson. Thanks

If you're using MQTT Servers IP address same as in video then please replace that IP address with "test.mosquitto.org". This is because the IP address has been changed for the server. Good luck and best wishes!

​@@BINARYUPDATES ok, and for having my personal server what do I do?

Yes, sometimes MQTT server IP address may change by free host. So please consider replace all IP address with "test.mosquitto.org" URL which will point to correct MQTT Server. That 5.xx was address while making this video. I hope this may help. Good luck and best wishes!

Hi Duan, close Arduino IDE and try to reupload the code. It seems an issue with Arduino IDE. This happens sometimes when libraries fail to link properly while compiling and uploading the sketch in ESP8266. I hope you find useful. Good luck and best wishes!

Hi Durgappa, the MQTT code is provided in the description. There is an GitHub link where you can download. I hope it can help.

Sometime MQTT Server changes IP address of server. You can ping "test.mosquitto.org" through your command prompt and make sure IP address of MQTT server and then try. Let me know what IP address you're trying.....

if u solve the problem pls tell me how did u do?

Hi Latheesh, the NodeMCU ESP8266 connection details are shared in GitHub repository shared in the description section. You'll find everything from MQTT example program to connection diagram. Good luck and best wishes!

😂 getting free internet from a wifi 100s of km away 😂

Hi, Please watch my "MQTTExplorer" video lesson which I've published last month on my channel. MQTTExplorer is very good alternative to obsolete MQTTLens. I hope this may help you. Good luck and best wishes!

Thank you very much for quick reply sir, but please make a video on how to use with nodemcu, thank you once again