bradfitz

Lutron LEAP Protocol Specification

LLM summary of the LEAP protocol based on reading pylutron-caseta (Python) and lutron-leap-js (TypeScript)

LEAP (Local Execution Access Protocol) is a proprietary JSON-over-TLS protocol used by Lutron smart lighting processors — including Caseta Smart Bridge, RadioRA 3 (RA3), and HomeWorks QSX (HWQSX) — for local LAN control of lighting, shading, fan, and sensor devices.

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Table of Contents

nledenyi

Viessmann Vitodens 100-W B1HG - Local OpenTherm control via ESP32/ESPHome (bypassing Viessmann cloud paywall)

Status: Implemented and running. Document reflects the working configuration as of April 2026, including Viessmann-specific quirks discovered during deployment.

Viessmann Vitodens 100-W B1HG - Local Control via OpenTherm

1. Background & Root Cause Analysis

The Problem: Viessmann Cloud API Paywall