simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
simgrid::s4u::Link::on_communication_state_change.connect(IB_action_state_changed_callback);
simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
simgrid::s4u::Link::on_communication_state_change.connect(IB_action_state_changed_callback);