... is connected to RVC service and listening for volume updates through http websocket (or xhr-streaming/polling) connection. This is a real-time communication channel, so
whenever you issue a command from your smartphone, it will be directed instantly to your computer.
this is how the desktop app looks like:
RVC Cloud Service
.. is hosted here, receiving connections for both desktop and smartphones, connecting them to each other.
Your Mobile Phone
.. is connected to RVC Cloud Service, authenticated to your device with the password you set on your desktop machine previously.
No Wifi or bluetooth involved here. Yaaay!