Constant gnunet_sys::GNUNET_MQ_PriorityPreferences_GNUNET_MQ_PREF_UNRELIABLE

pub const GNUNET_MQ_PriorityPreferences_GNUNET_MQ_PREF_UNRELIABLE: GNUNET_MQ_PriorityPreferences = 16;

Flag to indicate that unreliable delivery is acceptable. This means TRANSPORT will not attempt to receive an acknowledgment. CORE will just pass this flag through. CADET will use unreliable delivery if this flag is set.

Note that even without this flag, messages may be lost by TRANSPORT and CORE.

Thus, how “strong” the semantics of reliable delivery are depends on the layer!