# MQTT Communication with Mosquitto Broker (Non Secure MQTT, Port 1883)

## L*ab Objective:*

&#x20;     In this lab, participants will explore the fundamentals of **MQTT (Message Queuing Telemetry Transport)** communication using the **Mosquitto public broker** at <https://test.mosquitto.org> on **port 1883**, with a **PSoC6 board**.

<figure><img src="/files/YsSGODRU6KEy3OE9sjIt" alt=""><figcaption></figcaption></figure>

The PSoC-6 board connects to the internet through a **Wi-Fi hotspot**, publishes a message such as **“TURN ON LED”**, and the PSoC-6 board will subscribes to receive the message and turns on its LED.

## 🔥 Requirements

<table><thead><tr><th width="429">Resources</th><th>Links</th></tr></thead><tbody><tr><td>Computer</td><td>💻</td></tr><tr><td>ModusToolbox™ software v3.0 or later</td><td><a href="https://www.infineon.com/modustoolbox">Link</a></td></tr><tr><td>CY8CKIT-062S2-43012 Infineon Board</td><td><a href="https://github.com/Advance-Innovation-Centre-AIC/BIIL_MTB-100_Hello_World_and_LED_Blinking_Programming_Template/assets/88732241/0215501d-b774-4045-8e64-ef49e28d8404">Link</a></td></tr><tr><td>Technical Report</td><td><a href="https://www.dropbox.com/scl/fi/amaxc94pte0ut2i1r5ewx/Technical-Report-Lab00.paper?rlkey=b3xm3vrerz9xgv1glb30cvy9z&#x26;dl=0">dropbox</a></td></tr></tbody></table>

## 🚩 Let start

### Create Application

<figure><img src="/files/EMUtqywL7b93r0afwbDI" alt=""><figcaption><p>Create Application</p></figcaption></figure>

### Coding

#### 1. Edit wifi\_config.h

* Use your mobile hotspot as an access point. Edit “wifi\_config.h” to match your mobile SSID setting:
  * \#define WIFI\_SSID “mobile\_ssid”&#x20;
  * \#define WIFI\_PASSWORD “password”

<figure><img src="/files/3r2uE8ToYmGqN4DHAfg3" alt=""><figcaption></figcaption></figure>

#### 2. Edit file mqtt\_client.h

Edit the following in “configs/mqtt\_client.h”:

* MQTT\_BROKER\_ADDRESS to “test.mosquitto.org”&#x20;
* Set the macros MQTT\_PORT to 1883
* MQTT\_SECURE\_CONNECTION to 1&#x20;
* MQTT\_USERNAME to “” MQTT\_PUB\_TOPIC to “unique\_topic”&#x20;
* MQTT\_SUB\_TOPIC to “unique\_topic”&#x20;
* MQTT\_SNI\_HOSTNAME to “test.mosquitto.org”

<figure><img src="/files/WDEqz3fsT7JxjmS5dqiX" alt=""><figcaption></figcaption></figure>

#### 3. Save the file

#### 4. Build and Launch the Application

### Open Putty, baud rate 115200

### Result&#x20;

* Press user button
* The GPIO interrupt service routine (ISR) notifies the publisher task.
* The publisher task publishes a message on a topic.
* The MQTT broker sends back the message to the MQTT client because it is also subscribed to the same topic.
* When the message is received, the subscriber task turns the LED ON or OFF. As a result, the user LED toggles every time the user presses the button.

<figure><img src="/files/TMakNue4cDqsJFaRA2E3" alt=""><figcaption></figcaption></figure>

> #### 🎉 <mark style="color:blue;">Congratulations! You can now complete this lab</mark>

## Supported toolchains (make variable 'TOOLCHAIN')

* GNU Arm® embedded compiler v10.3.1 (`GCC_ARM`) - Default value of `TOOLCHAIN`
* Arm® compiler v6.16 (`ARM`)
* IAR C/C++ compiler v9.30.1 (`IAR`)

## Supported kits (make variable 'TARGET')

* [PSoC™ 62S2 Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CY8CKIT-062S2-43012) (`CY8CKIT-062S2-43012`)
* [PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CYW9P62S1-43438EVB-01) (`CYW9P62S1-43438EVB-01`)
* [PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit](https://www.infineon.com/CYW9P62S1-43012EVB-01) (`CYW9P62S1-43012EVB-01`)
* [PSoC™ 62S3 Wi-Fi Bluetooth® prototyping kit](https://www.infineon.com/CY8CPROTO-062S3-4343W) (`CY8CPROTO-062S3-4343W`)

## Related resources

| Resources                       | Links                                                                                                                                                      |
| ------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ModusToolbox™ Software Training | [link](https://www.dropbox.com/sh/waj898o4o8eccx0/AAB3hBBaIQo2OvJ5-fubGJIha/training-modustoolbox-level1-getting-started-master/Manual/Ch2-Tools.pdf?dl=0) |

## Other resources

Infineon provides a wealth of data at [www.infineon.com](http://www.infineon.com) to help you select the right device, and quickly and effectively integrate it into your design.

## Document history

<table><thead><tr><th width="149">Version</th><th>Description of change</th></tr></thead><tbody><tr><td>1.0.0</td><td>MQTT via Mosquitto broker</td></tr></tbody></table>

## Authors:

* *Assoc. Prof. Wiroon Sriborrirux*
* *Mr. Sriengchhun Chheang*
* *Mr. Sabol Socare*<br>

<br>

***

© BDH Corporation, 2022-2023


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