gap: emit GAP_SUBEVENT_LE_CONNECTION_COMPLETE for failed outgoing connections

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixed
 - GAP: allow use of own address type different from gap_random_set_mode() incl. RPA in LE Extended Advertising
+- GAP: emit GAP_SUBEVENT_LE_CONNECTION_COMPLETE for failed outgoing connections
 - SM: abort pairing with invalid parameter error for encryption key size > 16
 - SM: ignore Security Request after re-encryption has started
 - SM: respond to Pairing Request after Identity Resolution failed

src/hci.c

@@ -3362,7 +3362,10 @@ static void hci_handle_le_connection_complete_event(const uint8_t * hci_event){
 			btstack_linked_list_remove(&hci_stack->connections, (btstack_linked_item_t *) conn);
 			btstack_memory_hci_connection_free( conn );
 		}
-		return;
+
+        // emit GAP_SUBEVENT_LE_CONNECTION_COMPLETE for error case
+        hci_emit_event(gap_event, sizeof(gap_event), 1);
+        return;
 	}
 #endif