ESP32 as MQTT Broker | How to Setup MQTT Broker with Custom TCP Port in ESP32 using PicoMQTT Library

3 months ago

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Transcript

00:00Hi, everyone, and welcome. In the previous video, we have covered ESP 32 as an MQTT broker,

00:09and we have used Pico MQTT library to convert our ESP 32 into the MQTT broker. So instead

00:15of Hive MQTT broker, Mosquito MQTT broker or Nano MQTT broker or any other cloud MQTT

00:22broker, you can use your ESP 32 board as an MQTT broker for your small scale application.

00:28But in that video, in that code, we have used port 1883, which is the default port

00:35for MQTT broker. Okay, but for some security reason, if you don't want to keep the default

00:41port 1883 for TCP communication or MQTT broker, then how you can change it in the Pico MQTT

00:47library. So that thing we are going to cover in this video. So basically, we will see how

00:52to set up basic MQTT broker with a custom port, okay, custom TCP port in ESP 32 using

00:58Pico MQTT library. So again, we are going to set up MQTT broker in the ESP 32 board.

01:04But instead of the port 1883, which is the default, we are going to select some other

01:08TCP port for MQTT communication. Okay, so let's see how you can do that. And here is

01:15the communication diagrams. So our ESP 32 board is in the center, which act as an MQTT

01:20broker for all of the client, and all of the client can publish to any topic, okay, and

01:25all of the client can subscribe to any topic, and they can exchange the data and everything

01:30will happen in the local area network communication. Okay, so your ESP 32 will connect with the

01:35Wi Fi, your ESP 32 c three or Python MQTT client also connect with the Wi Fi and they

01:40can publish and subscribe the messages. So instead of port 1883, we want to start our

01:46MQTT broker with some different ports. So let's see how you can do that. So here is

01:51the Arduino ID. Okay, I have already installed Pico MQTT library in my Arduino ID, you can

01:58see Pico MQTT is already installed. Now we will go to the examples and here we will search

02:04for the Pico MQTT folder. Okay, here you can see Pico MQTT. And here you can see the example

02:11server with custom port. So we are going to select this example. When you load this example

02:17into the ESP 32 board, your ESP 32 board will act as an MQTT broker, but it will run

02:23your MQTT broker on custom MQTT port. Okay, here you can see. So whatever TCP port you

02:30define here, your MQTT broker will run on that TCP port. Okay, so first of all, you

02:36have to provide your Wi Fi SSID here. So my Wi Fi SSID is and here we have to provide

02:43the password for your Wi Fi. And then after on whatever TCP port you want to start your

02:50MQTT broker, you can specify that in this line. So instead of port 1883, if you want

02:57to start your MQTT broker on the port 9000, then you can specify the port 9000 here. So

03:03your client has to use the port 9000 to connect with your ESP 32 MQTT broker, they cannot

03:10use port 1883 to connect with this MQTT broker. Okay, and rest of the code is same as the

03:15previous video. So it will connect with the Wi Fi. Okay, and then it will continuously

03:20run our broker. So I'm going to upload this sketch into our ESP 32 board. Okay, so I'm

03:27going to hit the upload button. Okay, here you can see done uploading. Now we can open

03:46serial monitor to find the IP address of our ESP 32 board. So I'm going to press reset

03:52button on my ESP 32. And here you can see connecting to Wi Fi. And here we have the

03:57IP address of our ESP 32 board. Now, in the previous video, also we have the same IP address

04:03of our ESP 32. But the port number was 1883. Now we have a different port number for MQTT

04:10communication. So let's open the MQTT client and let's connect with our ESP 32 MQTT broker.

04:17So I'm going to open MQTT Explorer here. And here you can see in the previous video,

04:24we have used port 1883 to connect with our ESP 32 broker. But if I try to connect then

04:29it won't able to connect because the MQTT broker is running on port 9000. So I have

04:35to abort it. And then I have to change the port number to 9000. And then I can connect

04:40it. Okay, here you can see we are connected. So if I use port 1883 then it won't let us

04:50connect Okay, it will always stay in the connection mode. Okay, it will try to connect but MQTT

04:58broker or ESP 32 won't respond to that connection request because of different port. So we have

05:03to change the port number to 9000. We have to abort it and then we have to connect again.

05:07And here you can see we are connected. I can again open one more MQTT Explorer client.

05:13Okay, and I can change the port number to 9000. And I can click on connect to connect

05:19with our ESP 32 MQTT broker on the different TCP port. Now the different TCP port is sometimes

05:25required due to firewall issues or some security reasons. Okay, so if we keep the port 1883

05:32as a default, then anyone can get access to our ESP 32 MQTT broker. And if we change

05:37the port, okay, instead of 9000 or 1883, if we change the port to something else, okay,

05:43as per our requirement, and as per our firewall rules, then no one can connect with that ESP

05:4832 MQTT broker. So that's why custom TCP port is required. Now I can publish some data to

05:54the test topic. Okay, the data is 123. And here we are going to receive the data. And

06:00also I can publish the data from here 456. And that I'm going to receive it here. Okay,

06:06so our MQTT broker running inside the ESP 32 is working fine. Our two different client

06:12can exchange the data with each other. So this client is also publishing and subscribing

06:18to the test topic. And this client also is publishing and subscribing to the same topic.

06:23So this is how you can use your ESP 32 as an MQTT broker with a custom port. Okay, or

06:28you can say custom TCP port for your MQTT broker communication. So I hope this thing

06:34is clear that how to set up basic MQTT broker with custom TCP port in ESP 32 using Pico

06:40MQTT library. If you still have any questions or any doubt, then you can always ping me

06:44on Telegram, Instagram, WhatsApp anywhere. All the social media link is available here

06:49on our website. So let's meet in the future videos. And in the next video, we will see

06:53how to set up secure MQTT broker in the ESP 32 using Pico MQTT library. So right now,

07:00whenever you try to connect with your ESP 32 broker, it won't ask for any username and

07:04password. Okay, you can see username and password field is empty. So if you want to set up the

07:10username and password, okay, if you want to make your ESP 32 broker secure, then how we

07:15can do that. So that thing we are going to cover in the next video. Okay, so stay tuned

07:19for the next video. Till then, take care. Goodbye. And thank you

ESP32 as MQTT Broker | How to Setup MQTT Broker with Custom TCP Port in ESP32 using PicoMQTT Library |

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