BTool.DeviceTabsForm.btnSendPairingRequest_Click C# (CSharp) Method

        private void btnSendPairingRequest_Click(object sender, EventArgs e)
        {
            PairBondFieldTabDisable(true);
            HCICmds.GAPCmds.GAP_Authenticate gapAuthenticate = new HCICmds.GAPCmds.GAP_Authenticate();
            gapAuthenticate.connHandle = devForm.devInfo.Handle;
            try
            {
                gapAuthenticate.connHandle = Convert.ToUInt16(tbPairingConnHandle.Text.Trim(), 16);
            }
            catch (Exception ex)
            {
                msgBox.UserMsgBox(SharedObjects.MainWin, MsgBox.MsgTypes.Error, string.Format("Invalid Connection Handle\nFormat: 0x0000\n\n{0}\n", ex.Message));
                tbPairingConnHandle.Focus();
                PairBondUserInputControl();
                return;
            }
            tbPasskeyConnHandle.Text = tbPairingConnHandle.Text;
            gapAuthenticate.secReq_ioCaps = HCICmds.GAP_IOCaps.KeyboardDisplay;
            gapAuthenticate.secReq_oobAvailable = HCICmds.GAP_TrueFalse.False;
            gapAuthenticate.secReq_oob = "00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00";
            byte num = (byte)0;
            if (ckBoxBondingEnabled.Checked && ckBoxAuthMitmEnabled.Checked)
                num = (byte)5;
            else if (ckBoxBondingEnabled.Checked)
                num = (byte)1;
            else if (ckBoxAuthMitmEnabled.Checked)
                num = (byte)4;
            gapAuthenticate.secReq_authReq = num;
            gapAuthenticate.secReq_maxEncKeySize = (byte)16;
            gapAuthenticate.secReq_keyDist = (byte)63;
            gapAuthenticate.pairReq_Enable = HCICmds.GAP_EnableDisable.Disable;
            gapAuthenticate.pairReq_ioCaps = HCICmds.GAP_IOCaps.NoInputNoOutput;
            gapAuthenticate.pairReq_oobDataFlag = HCICmds.GAP_EnableDisable.Disable;
            gapAuthenticate.pairReq_authReq = (byte)1;
            gapAuthenticate.pairReq_maxEncKeySize = (byte)16;
            gapAuthenticate.pairReq_keyDist = (byte)63;
            ShowProgress(true);
            devForm.StartTimer(DeviceForm.EventType.PairBond);
            devForm.sendCmds.SendGAP(gapAuthenticate);
        }