To avoid recurring collisions of e.g. two temp sensors that send at the same time with the same interval, add an additional random waiting time after sending a packet.
Not necessary, because the timer of the RFM12 is not accurate, but only within 5% according spec. This means the natural inaccuracy of wake-up cycles is enough to make repeated collisions unlikely.
To avoid recurring collisions of e.g. two temp sensors that send at the same time with the same interval, add an additional random waiting time after sending a packet.