rsv_blocks.push_back(BlockRef(link, link->get_endpoint_by_link(*last->block)));
last = &rsv_blocks.back();
if(last->block->get_sensor_id())
{
++nsens;
rsv_blocks.push_back(BlockRef(link, link->get_endpoint_by_link(*last->block)));
last = &rsv_blocks.back();
if(last->block->get_sensor_id())
{
++nsens;