Sent data point from one device to another

[Name]

Hello, imagine a situation:
There is a thermometer, and I want it to send measurements to another device, that I will develop.

While looking at docs and trying everything out, I can't find a way to do that. I can set some booleans,
set constants to properties etc, but can't find a way to set dp from thermometer to dp on my device.
Or anything else to transfer information from thermometer to device.

All I can see I can do is to configure scene as such:
if t > 0 && t < 1 then set temp 0
if t > 1 && t < 2 then set temp 1
if t > 2 && t < 3 then set temp 2
if t > 3 && t < 4 then set temp 3
... up to a 50 idk ...

Thanks