Packets Per Connection Interval

Hello everyone,

i am using SDK 5.0.3 to program a DA14583 Bluetooth peripheral.
I have a specific Question to the following code part:

struct custs1_val_ntf_req* req = KE_MSG_ALLOC_DYN(CUSTS1_VAL_NTF_REQ,
TASK_CUSTS1,
TASK_APP,
custs1_val_ntf_req,
DEF_CUST1_NTF_CHAR_LEN);
...
ke_msg_send(req);