diff --git a/src/ble/att_server.c b/src/ble/att_server.c
index 4c61407f1..fce0f9577 100644
--- a/src/ble/att_server.c
+++ b/src/ble/att_server.c
@@ -857,14 +857,7 @@ void att_server_request_can_send_now_event(hci_con_handle_t con_handle){
 
 void att_server_register_can_send_now_callback(btstack_context_callback_registration_t * callback_registration, hci_con_handle_t con_handle){
     // check if valid con handle
-    switch (gap_get_connection_type(con_handle)){
-        case BD_ADDR_TYPE_LE_PUBLIC:
-        case BD_ADDR_TYPE_LE_RANDOM:
-            break;
-        default:
-            // con handle not valid for att send
-            return;
-    }
+    if (gap_get_connection_type(con_handle) != GAP_CONNECTION_LE) return;
     callback_registration->context = (void*)(uintptr_t) con_handle;
     btstack_linked_list_add_tail(&can_send_now_clients, (btstack_linked_item_t*) callback_registration);
     att_dispatch_server_request_can_send_now_event(con_handle);