require pal event handler to be complete

paul-szczepanek-arm · paul-szczepanek-arm · commit 3808db90b25b · 2019-02-14T12:34:34.000Z
diff --git a/features/FEATURE_BLE/ble/pal/PalGattClient.h b/features/FEATURE_BLE/ble/pal/PalGattClient.h
@@ -71,9 +71,7 @@ class GattClient {
         virtual void on_att_mtu_change(
             ble::connection_handle_t connection_handle,
             uint16_t att_mtu_size
-        )
-        {
-        }
+        ) = 0;
     };
 
     /**
