BLE_GAP_SLAVE_LATENCY_WAIT_FOR_ACK

#define BLE_GAP_SLAVE_LATENCY_WAIT_FOR_ACK   (2)

#include <ble_gap.h>

The slave will wake up every connection event if it has not received an ACK from the master for at least slave latency events. This configuration may increase the power consumption in environments with a lot of radio activity.