CCS/CC2640: Questions about software functions

Tool/software: Code Composer Studio

Dear all：

      I have a question about the following software functions on CC2640. Could you provide relevant software documentation?

static void SimpleBLEPeripheral_sendAttRsp(void)
{
// See if there's a pending ATT Response to be transmitted
if (pAttRsp != NULL)
{
uint8_t status;

// Increment retransmission count
rspTxRetry++;

// Try to retransmit ATT response till either we're successful or
// the ATT Client times out (after 30s) and drops the connection.
status = GATT_SendRsp(pAttRsp->connHandle, pAttRsp->method, &(pAttRsp->msg));
if ((status != blePending) && (status != MSG_BUFFER_NOT_AVAIL))
{
// Disable connection event end notice
HCI_EXT_ConnEventNoticeCmd(pAttRsp->connHandle, selfEntity, 0);

// We're done with the response message
SimpleBLEPeripheral_freeAttRsp(status);
}
else
{
// Continue retrying
Display_print1(dispHandle, SBP_ROW_STATUS_1, 0, "Rsp send retry: %d", rspTxRetry);
}
}
}