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# ESP32 MQTT Client Examples
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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](https://pubsubclient.knolleary.net/).
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## Prerequisites
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* Arduino ESP32 development board management address: https://dl.espressif.com/dl/package_esp32_index.json
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## Arduino settings
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* Installing the ESP32 Board
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```
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Tools -> Board -> Boards Manager... -> -> Type ESP32 in Search field -> Install
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```
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* Installing the PubSubClient Library
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```bash
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Sketch -> Include Library -> Manage Libraries... -> Type PubSubClient in Search field -> Install PubSubClient by Nick O’Leary
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```
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## Ino File
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* esp32_connect_mqtt.ino: ESP32 connects to the MQTT broker
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* esp32_connect_mqtt_via_tls.ino: ESP32 connects to the MQTT broker via TLS
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* esp32_DS18B20_temp_chart: ESP32 connects to the MQTT broker and uploads DS18B20 temperature sensor data, while displaying the temperature chart in real time
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* esp32_DS18B20_sensor_via_tls.ino: ESP32 connects to the MQTT broker via TLS and uploads DS18B20 temperature sensor data
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* esp32_soil_moisture_sensor_via_tls.ino: ESP32 connects to the MQTT broker via TLS and uploads soil moisture sensor data
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## TLS Config
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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.
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