Constant gnunet_sys::GNUNET_MQ_PriorityPreferences_GNUNET_MQ_PRIO_BACKGROUND

pub const GNUNET_MQ_PriorityPreferences_GNUNET_MQ_PRIO_BACKGROUND: GNUNET_MQ_PriorityPreferences = 0;

Lowest priority, i.e. background traffic (i.e. NSE, FS). This is the default!