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MCP Smart Home Server

Hearth

Your home, sovereign.

The Problem

Your smart home sends everything to the cloud

Every voice command, every temperature reading, every time you turn on a light: it all leaves your network, travels to a corporate server, gets processed, and comes back. Your home's data lives in someone else's infrastructure.

When the cloud goes down, your "smart" home goes dumb. When the company pivots, your devices get bricked. When they change the privacy policy, you accept or lose control.

Hearth puts the intelligence back where it belongs: in your home.

How It Works

Talk to your home. It listens locally.

Hearth — Connected

Hearth is an MCP server. It speaks the Model Context Protocol. Connect it to Claude or any MCP-compatible AI and control your devices with natural language. Every command stays on your local network.

MCP Tools

Six tools. Complete control.

get_status

Read current state: power, humidity level, mode, faults, countdown timer. Full device snapshot in one call.

power

Turn devices on or off. Boolean simplicity. No ambiguity.

set_humidity

Set target humidity level (25-80%). The device maintains it autonomously once set.

set_mode

Switch between operating modes: smart, continuous, clothes drying. Each mode optimises differently.

set_child_lock

Enable or disable the physical control lock. Safety when you need it.

set_countdown

Auto-shutoff timer in hours. Set it and forget it. The device sleeps when the timer expires.

Under the Hood

Local TCP. AES-128 encryption. Zero cloud.

01

Command

AI sends an MCP tool call: "set humidity to 45%"

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02

Encrypt

Hearth encrypts the command with AES-128 ECB using your device's local key

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03

Transmit

TCP packet sent directly to the device on your local network. Port 6668. No internet.

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04

Respond

Device acknowledges. Hearth decrypts, validates CRC32, returns status to the AI.

Tuya protocol v3.3. Heartbeat keepalive every 10 seconds. Device IP, ID, and local key configured once in hearth.toml. No accounts. No tokens. No cloud API. Your encryption key lives on your machine and nowhere else.

Current Support

Starting with what matters

Meaco Arete Two 25L

Dehumidifier: smart humidity control, multiple operating modes, fault monitoring, countdown timer

Power ON
Target 45%
Current 52%
Mode Smart

Hearth's architecture supports any Tuya-protocol device. Lights, switches, sensors, thermostats: anything that speaks Tuya v3.3 can be sovereign.

Built With

Rust
Tokio
RMCP
AES-128
CRC32

Your home. Your control.

Your devices. Your network. Your data. A Rust server that speaks directly to your things, entirely on your local network.

Get in Touch