The question is quite vague, particularly in the "send" part.
So I will make a generic answer: please, take a look at the Technical FAQ and see if helps.
If not, just ask again...

you could do something like this:

1. void draw() {
2.       if(frameCount % 60 == 0){
3.             whereToSendRandomNumber(random(1, -1));
   
4.       }
   
5. }

assuming your framerate is 60fps, it will call a function, passing a random number between 1 and -1

good luck!
ak

Here, i made this test. With all the above...

Look at the lerp() function.