UPM209 ESP Extension

ESP32-S3 firmware that reads electrical measurements from a UPM209 meter over Modbus RTU, processes resilient rolling samples, and uploads normalized JSON data.

View source

UPM209 ESP Extension data pipeline and ESP32-S3 monitoring project

Architecture

UPM209 ESP Extension architecture flow from Modbus input to HTTP JSON upload

Highlights

• Configurable ESP-IDF 5.4.x target and partition layout.
• Retry-aware HTTP delivery with queued samples when the endpoint is unavailable.
• Device metadata including MAC-derived device ID, firmware version, and timestamp.
• Clear service boundaries for extending register maps, storage policies, and transport options.

Built with

Technology

ESP-IDF
ESP32-S3
C
FreeRTOS
Modbus