Project Brief

Project Name

Modbus-to-MQTT Bridge for Environmental Sensor

Overview

This project implements a Python-based bridge that reads temperature and humidity data from a Modbus TCP device and publishes the readings to an MQTT broker in JSON format. The system is designed for continuous, automated data acquisition and integration with IoT or monitoring platforms.

Core Requirements

Connect to a Modbus TCP device (sensor gateway) to read holding registers for temperature and humidity.
Process and calibrate the raw sensor data as per device documentation.
Publish the processed data to a specified MQTT topic at a configurable interval.
Support MQTT authentication (username/password).
Provide clear logging for connection, data acquisition, and publishing events.

Goals

Enable seamless integration of Modbus-based sensors with MQTT-based IoT systems.
Ensure reliable, periodic data transfer with error handling and reconnection logic.
Maintain code clarity and extensibility for future enhancements (e.g., more sensors, additional data fields).

Scope

Single Python script (poe.py) as the main application.
No web interface or GUI; headless operation via command line.
Focus on environmental data (temperature, humidity) but extensible for other Modbus registers.
No persistent storage; data is transient and only sent to MQTT.

1.4 KiB Raw Blame History