bborncr / esp32_bme688

Example code for BME688 sensor and ESP32 with MQTT

ESP32 BME688 Example code

Arduino IDE

Currently using Arduino IDE 1.8.13

Libraries

All libraries can be installed directly from the Library Manager in the IDE

• EspMQTTClient 1.13.3 (will install PubSubClient)
• ArduinoJson 6.18.5
• Adafruit BME680 2.0.1 (will install Adafruit Unified Sensor Library)

Configuration

1. Copy the configexample.h file and rename it config.h
2. Edit the settings in config.h for your ClientId (deviceId), mqtt broker and wifi settings

Payload

Chispas protocol parser (lite version of Sparkplug B)

Topic format: <Namespace>/<GroupId>/<MessageType>/<deviceId>

Message types:

• DBIRTH (sent when device connects)
• DDEATH (sent by MQTT broker when device disconnects)
• DDATA (JSON payload)
• DDCMD (send commands to the device)

In my NODE-RED setup and INFLUX database I do the following mapping:

• The Measurement is taken from <Namespace>/<GroupId>/<MessageType>
• Incoming payload can be any single object (no nested objects or lists)
• The payload is mapped to the key/value fields in the database
• The deviceId from the topic is mapped to the Influx tags (indexes)