LAUNCHXL-CC2640R2: Pairing states delay

Hello,

I configured simple_central and simple_peripheral projects to use passcode (BLE5-Stack).

Central device's config:

// Set Bond Manager parameters
{
uint8_t pairMode = GAPBOND_PAIRING_MODE_INITIATE;
uint8_t mitm = TRUE;
uint8_t ioCap = GAPBOND_IO_CAP_KEYBOARD_ONLY;
uint8_t bonding = TRUE;

GAPBondMgr_SetParameter(GAPBOND_PAIRING_MODE, sizeof(uint8_t), &pairMode);
GAPBondMgr_SetParameter(GAPBOND_MITM_PROTECTION, sizeof(uint8_t), &mitm);
GAPBondMgr_SetParameter(GAPBOND_IO_CAPABILITIES, sizeof(uint8_t), &ioCap);
GAPBondMgr_SetParameter(GAPBOND_BONDING_ENABLED, sizeof(uint8_t), &bonding);
}

Perihperal device's config:

{
uint8_t pairMode = GAPBOND_PAIRING_MODE_WAIT_FOR_REQ;
uint8_t mitm = TRUE;
uint8_t ioCap = GAPBOND_IO_CAP_DISPLAY_ONLY;
uint8_t bonding = TRUE;

GAPBondMgr_SetParameter(GAPBOND_PAIRING_MODE, sizeof(uint8_t), &pairMode);
GAPBondMgr_SetParameter(GAPBOND_MITM_PROTECTION, sizeof(uint8_t), &mitm);
GAPBondMgr_SetParameter(GAPBOND_IO_CAPABILITIES, sizeof(uint8_t), &ioCap);
GAPBondMgr_SetParameter(GAPBOND_BONDING_ENABLED, sizeof(uint8_t), &bonding);
}

Both devices have smilar passcode process function:

static void SimpleXXX_processPasscode(scPasscodeData_t *pPasscodeData)
{
  // Display passcode to user
  if (pPasscodeData->uiOutputs != 0)
  {
    Display_printf(dispHandle, SC_ROW_CUR_CONN, 0, "Displaying passcode: %d",
                   B_APP_DEFAULT_PASSCODE);
  }
  if (pPasscodeData->uiInputs != 0)
  {
      Display_printf(dispHandle, SC_ROW_CUR_CONN, 0, "Entering passcode: %d",
                         B_APP_DEFAULT_PASSCODE);
  }

  // Send passcode response
  GAPBondMgr_PasscodeRsp(pPasscodeData->connHandle, SUCCESS,
                         B_APP_DEFAULT_PASSCODE);
}

When it comes to the pairing, the Initiator displays: "Displaying passcode: 123456", and Responder displays "Entering passcode: 123456", however it takes around 18 seconds before both devices receive GAPBOND_PAIRING_STATE_COMPLETE event. Status of the event is success.

What is the reason of having such time delay between entering the passcode and receiving GAPBOND_PAIRING_STATE_COMPLETE event? Can I do something to make it shorter?

Br,

Krzysztof