Where to begin. Need to write a program on a PC and phone with fast synchronization?

Question

Android

Tell me where to start.
You need to write a program on a PC and a phone with fast data synchronization between them.
Windows PC receives any data from sensors (for example, air temperature, humidity, etc.), it is necessary to display, store the results, both on the PC and on the android phone, and have synchronization. Also, the ability to control both from the phone and from the PC cameras, etc. Synchronization of the PC <-> Phone is as fast as possible and via the Internet.
We have
1 PC windows
2 Android phone
3 Some knowledge in programming: for android java; c++, delphi and the desire to learn programming
Tell me where to start:
choosing the best language for this purpose,
how to synchronize programs on a PC <-> Phone

Answer 1

Sensors, as I understand it, are external, connected to a PC, and not to a phone?
On a PC, the rest is a server, on which you implement it, it doesn’t matter, but I would recommend something with .net, for example, c#, and working with ports without problems, and there are many solutions for the server.
On the client, everything is standard ─ java, retrofit for the rest (it is possible without it)
Everything is in essence.

Answer 2

sockets of course, and any PL

Answer 3

I think a web application would be the simplest solution, since the browser is everywhere and you don’t have to delve into the intricacies of the operating system.