BT_UUID_ANCS_DATA_SOURCE_VAL

#define BT_UUID_ANCS_DATA_SOURCE_VAL    BT_UUID_128_ENCODE(0x22eac6e9, 0x24d6, 0x4bb5, 0xbe44, 0xb36ace7c7bfb)

#include <include/bluetooth/services/ancs_client.h>

Data Source Characteristic UUID.