About

This repository contains a small embedded library called mqtt311-client-library for MQTT 3.1.1 clients, which fully supports all functionalities from the MQTT 3.1.1 standard. You can find the standard documentation at https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html.

This library can work on any microcontroller or system that has an internet connection and can open a TCP or TLS socket.

Features

• Fully supports all MQTT 3.1.1 packet types (CONNECT, PUBLISH, etc.).
• Provides a number of external functions to set in order to connect to the MQTT broker, send, and receive data.
• Incorporates FreeRTOS to have separate send and receive tasks.
• Uses queues to send messages so nothing is ever blocked.

Detailed Documentation

For more in-depth information, see the following documents:

• FreeRTOS Incorporation
• Flexibility and Extensibility

Usage

There are two complete examples on how to use this library to connect to an MQTT broker (test.moqsuitto.org).

TCP Connection

For example usage with TCP socket, check out the ESP32 TCP example

SSL Connection

For example usage with SSL socket, check out the ESP32 SSL example