component/bt: Fix bug of disconnected fail during pairing

components/bt/bluedroid/stack/smp/smp_l2c.c

@@ -69,8 +69,12 @@ void smp_l2cap_if_init (void)
     fixed_reg.pL2CA_FixedTxComplete_Cb = smp_tx_complete_callback;
 
     fixed_reg.pL2CA_FixedCong_Cb = NULL;    /* do not handle congestion on this channel */
-    fixed_reg.default_idle_tout  = 60;      /* set 60 seconds timeout, 0xffff default idle timeout */
-
+    fixed_reg.default_idle_tout  = 0;       /* set 0 seconds timeout, 0xffff default idle timeout.
+                                            This timeout is used to wait for the end of the pairing
+                                            and then make a disconnect request, setting a larger value
+                                            will cause the disconnect event to go back up for a long time.
+                                            Set to 0 will be disconnected directly, and it will come up
+                                            pairing failure, so it will not cause adverse effects. */
     L2CA_RegisterFixedChannel (L2CAP_SMP_CID, &fixed_reg);
 #if (CLASSIC_BT_INCLUDED == TRUE)
     fixed_reg.pL2CA_FixedConn_Cb = smp_br_connect_callback;