mfsk_core::msg::ap

Trait WsjtApCompatible

pub trait WsjtApCompatible: MessageCodec + Sealed { }

Expand description

Marker trait for MessageCodecs whose information-bit layout matches the 77-bit Wsjt77 family field positions (call1 at 0..28, call2 at 29..57, grid at 58..73, message-type i3 at 74..76). Used to gate the callsign/grid-based ApHint AP path to compatible protocols.

Implementing this trait is an assertion that the codec’s bit layout is byte-for-byte equivalent to crate::msg::Wsjt77Message for the first 77 bits — the AP module reads / writes those positions directly. Codecs with different layouts (e.g. byte-oriented packet codecs whose first bits encode a length field rather than a callsign hash) must NOT implement this trait; they need their own AP design.

Sealed: only the mfsk-core crate may implement.