Here's a diagram of what I'm talking about.
Android -> USB -> PC/Server -> Internet.
The PC/Server has an Internet connection and is running Windows 2003. Android is connected to the PC/Server through a USB connection.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes