I need that precision because my arduinos will be reading data and sending it at high frequencies. Arduinos should start transmitting data at the same time otherwise it will make no sense for the device which will collect it.
Suppose that we send temperature at the pair iterations and pressure at the odd iterations. The device to which arduinos will send these values shouldn't be receiving at t time the temprature related to T = 3s and the pressure related to T= 5s. I don't know if that seems clear.