MQTT Device Discovery in Arduino Code

General
1

I’ve been working on integrating my Arduino-based solar monitoring system with Home Assistant using MQTT. While I’ve managed to establish a connection and see individual sensors, the device discovery feature isn’t working as expected. I’ve tried various troubleshooting steps, including checking the MQTT broker logs and ensuring the discovery payloads are correctly formatted. Here’s what I’ve done and where I’m stuck:

  1. MQTT Connection Setup: I’ve configured the Arduino code to connect to my MQTT broker with the correct credentials. The connection is successful, and I can see sensor data being published to the broker.

  2. Discovery Payloads: I’ve implemented a function to publish discovery messages for each sensor. The payloads include necessary fields like name, state_topic, unit_of_measurement, and device information. However, Home Assistant isn’t recognizing these devices.

  3. Debugging Steps: I’ve added debug prints to ensure the discovery messages are being published. They appear in the Serial Monitor, but I haven’t confirmed if they’re reaching the broker. I plan to check the broker’s logs next.

  4. Potential Issues:

    • JSON Formatting: There might be syntax errors in the JSON payloads, such as missing commas or incorrect quotes.
    • Timing: The discovery messages might be published before the MQTT client is fully connected.
    • Home Assistant Configuration: I need to verify that MQTT discovery is enabled and properly configured in Home Assistant.

I’m looking for guidance on how to ensure the discovery messages are correctly structured and successfully received by Home Assistant. Any tips or suggestions would be greatly appreciated!