Researcher Tomasz Wasilczyk successfully reverse-engineered the proprietary communication protocol of the Waterdrop G3P600 reverse-osmosis system, enabling integration with home automation platforms like ESPHome and Home Assistant.

Key Points

• The Waterdrop G3P600 uses a four-pin serial connection operating at 9,600 baud to communicate between the filtration unit and its smart faucet.
• Reverse-engineering the protocol revealed data points including filter health, water quality, pump status, air temperature, and faucet state.
• A custom PCB was developed to bridge the RO unit with Home Assistant, allowing for advanced monitoring and automated control.
• The project enables users to integrate high-end water filtration systems into broader smart home ecosystems for improved maintenance tracking.

Why it Matters

This project demonstrates how consumers can bypass proprietary limitations to gain deeper control over smart home appliances. By integrating filtration data into centralized platforms, users can achieve better maintenance scheduling and improved water quality monitoring.