Hi everyone, I want to share my custom ESPHome **external component** for the **DTS-238-7** three-phase smart meter (native to WISEN app / Hekr protocol). It completely removes cloud dependencies, brings full feature parity locally into Home Assistant (energy, voltage, current, calibrations, relay controls), and maintains physical button overrides as a fail-safe. The repository is fully documented with hardware modification steps and a dashboard layout config (`lovelace.yaml`). 
**Full code and documentation here:** GitHub - SergyiSviderskii/esphome-wisen-dts238: Local ESPHome firmware integration for the DTS-238-7 three-phase smart meter (WISEN / Hekr protocol). Provides complete cloud-free Home Assistant integration via API/MQTT with physical button fail-safe support. · GitHub Feel free to check it out or ask questions!