Robot positioning using global camera

I'm trying to use global camera as mobile robot indoor positioning system. there are 3 robot to achieve some formation. the open CV program worked well so far.

I use NRF24 as transceiver, also worked well with simple tutorial from internet (arduino-arduino).

the camera detect object position successfully by simple hsv method

the problem is how to send (x,y) data position from PC to arduino (robot)? i try a lot of keyword, and the result is: sending array command to turn on the LED or something like that. i try that tutorial and it works, but that's not i want. I want to send int/float x,y position. i use c++ fyi

am I on the right way to follow that youtube tutorial above?
any advise, or keyword?

Here you go