NRF_RAI_ONE_RESP

#define NRF_RAI_ONE_RESP   3

#include <nrf_modem/include/nrf_socket.h>

Indicate that the application is expecting to receive just one data packet after the next call to nrf_send() or nrf_sendto().

This lets the modem exit connected mode more quickly after having received the data. (After the next output operation is complete, wait for one more packet to be received from the network on this socket before entering RRC idle mode).