Widget & Settings UI Development Guide
How to build widget.html and settings.html for SelenaCore modules: CSS grid, iframe rules, BASE URL, adaptive layouts, SSE, templates.
Module-Core Communication Protocol
Complete protocol: token lifecycle, Bearer auth, Event Bus delivery, HMAC verification, UI widgets, Secrets Vault & OAuth proxy, Cloud Sync.
Module Development for SelenaCore
Create isolated Docker modules: manifest.json, SmartHomeModule SDK, local dev workflow, webhook handling, OAuth integration.