simgrid::s4u::Link::on_communication_state_change.connect(
[](simgrid::kernel::resource::NetworkAction const& action,
simgrid::kernel::resource::Action::State /* previous */) {
simgrid::s4u::Link::on_communication_state_change.connect(
[](simgrid::kernel::resource::NetworkAction const& action,
simgrid::kernel::resource::Action::State /* previous */) {