Preview of the proposed up-rust native-frame-model branch (up-rust b6b99c6d, up-spec f0e9b17) — not released documentation. branch · write-up
up_rust::frame::codec

Constant FIELD_MASK_V1

Source 
pub const FIELD_MASK_V1: u32 = _; // 255u32
Expand description

All presence bits defined by field block version 1.