Device Engine <- MQTT <- MQTT Sensor
Device Engine <-> MQTT <-> MQTT Device

Device Engine <-stream- Homekit Sensor
Device Engine <-stream-> HomeKit Device

Device Engine -stream-> User Interface
Device Engine -> web Trigger API -> Trigger and Automation Engine
Trigger and Automation Engine -> web Scene API -> Scene Engine
Scene Engine -> web Devices API -> Device Engine
User Interface -> web Devices API -> Device Engine
User Interface -> web Trigger API -> Trigger and Automation Engine
User Interface -> web Scene API -> Scene Engine