flua UI viewer — served by flua --ui at this address, it polls GET /devices, renders properties.uiView (live state merged from device.view, the target of QuickApp:updateView), prepends the device type's default view (On/Off buttons, state label, dimmer — from GET /flua/embeddedUI), and injects interactions via GET /plugins/callUIEvent or device actions — the same contract the real HC3 UI uses. The API field can point at another machine running flua (leave user/pass empty; they exist for a real HC3).