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arduino/mqtt-client-ESP32/README.md

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ESP32 MQTT Client Examples

In this example we provide sample code for TCP protocol connection to the MQTT Broker. For more documentation on using the ESP32 MQTT client, see the Pubsubclient Documentation.

Prerequisites

Arduino settings

  • Installing the ESP32 Board
Tools -> Board -> Boards Manager... -> -> Type ESP32 in Search field -> Install
  • Installing the PubSubClient Library
Sketch -> Include Library -> Manage Libraries... -> Type PubSubClient in Search field -> Install PubSubClient by Nick O’Leary

Ino File

  • esp32_connect_mqtt.ino: ESP32 connects to the MQTT broker
  • esp32_connect_mqtt_via_tls.ino: ESP32 connects to the MQTT broker via TLS
  • esp32_DS18B20_temp_chart: ESP32 connects to the MQTT broker and uploads DS18B20 temperature sensor data, while displaying the temperature chart in real time
  • esp32_DS18B20_sensor_via_tls.ino: ESP32 connects to the MQTT broker via TLS and uploads DS18B20 temperature sensor data
  • esp32_soil_moisture_sensor_via_tls.ino: ESP32 connects to the MQTT broker via TLS and uploads soil moisture sensor data

TLS Config

For TLS connection example code, the default includes DigiCert Global Root G2 (broker.emqx.io.crt) and DigiCert Global Root CA (emqxsl-ca.crt) ca_cert certificates, please modify according to the usage scenario.