the send request to the medium access control (MAC) layer. Therefore, it is a function of the processor load and the system call overhead of the respec- tive OS ported on the transmitter platform. nRF- 24Cheep does not have an OS port, and makes direct system calls to the underlying hardware without any (potential) soft routing. This enables more user control over different system modules (albeit with increased complexity), and thus helps to reduce delays that are typically nondeterminis- tic and were previously difficult to calibrate