OpenDTU

!!! IMPORTANT UPGRADE NOTES !!!

If you are upgrading from a version before 15.03.2023 you have to upgrade the partition table of the ESP32. Please follow the this documentation!

Background

This project was started from this discussion (Mikrocontroller.net). It was the goal to replace the original Hoymiles DTU (Telemetry Gateway) with their cloud access. With a lot of reverse engineering the Hoymiles protocol was decrypted and analyzed.

Documentation

The documentation can be found here. Please feel free to support and create a PR in this repository to make the documentation even better.

Breaking changes

Generated using: git log --date=short --pretty=format:"* %h%x09%ad%x09%s" | grep BREAKING

* 8cab3335      2025-08-07      BREAKING CHANGE: WebAPI endpoint `/api/limit/config` requires different parameters
* 8372deaf      2025-04-18      BREAKING CHANGE: Logging newline changed from "\r\n" to "\n"
* 1b637f08      2024-01-30      BREAKING CHANGE: Web API Endpoint /api/livedata/status and /api/prometheus/metrics
* e1564780      2024-01-30      BREAKING CHANGE: Web API Endpoint /api/livedata/status and /api/prometheus/metrics
* f0b5542c      2024-01-30      BREAKING CHANGE: Web API Endpoint /api/livedata/status and /api/prometheus/metrics
* c27ecc36      2024-01-29      BREAKING CHANGE: Web API Endpoint /api/livedata/status
* 71d1b3b       2023-11-07      BREAKING CHANGE: Home Assistant Auto Discovery to new naming scheme
* 04f62e0       2023-04-20      BREAKING CHANGE: Web API Endpoint /api/eventlog/status no nested serial object
* 59f43a8       2023-04-17      BREAKING CHANGE: Web API Endpoint /api/devinfo/status requires GET parameter inv=
* 318136d       2023-03-15      BREAKING CHANGE: Updated partition table: Make sure you have a configuration backup and completly reflash the device!
* 3b7aef6       2023-02-13      BREAKING CHANGE: Web API!
* d4c838a       2023-02-06      BREAKING CHANGE: Prometheus API!
* daf847e       2022-11-14      BREAKING CHANGE: Removed deprecated config parsing method
* 69b675b       2022-11-01      BREAKING CHANGE: Structure WebAPI /api/livedata/status changed
* 27ed4e3       2022-10-31      BREAKING: Change power factor from percent value to value between 0 and 1

Currently supported Inverters

A list of all currently supported inverters can be found in the supported inverter overview.

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