message: Increase number of background threads to allow parallel service calls.
diff: @@ -103,8 +103,8 @@ int main(int argc, char** argv) {
  recovery_action_server.start();
  - // Start background thread for message handling
  - ros::AsyncSpinner spinner(1);
  + // Start background threads for message handling
  + ros::AsyncSpinner spinner(4);
  spinner.start();
  while (ros::ok()) {
  