How to calculate the information load on the network?

Question

Computer networks

(mesh network of 600 sensors, according to the 802.15.4 standard, sensors send readings every 30 seconds)

Answer 1

It remains only to find out the size of the sent data and multiply everything, for example:
1MB / 30 * 600 = 20 KB per second
It is clear that you need to add overhead protocols, but the idea is very simple.