Module codec 

ECR17 packet framing: encode/decode STX payload ETX LRC application frames, SOH message EOT progress updates (no LRC), and ACK/NAK control frames.

PacketCodec::decode treats the input buffer as exactly one frame. Frame shapes differ: an application frame ends with its LRC byte, a progress frame ends with EOT (no LRC), and a control frame is recognized by its lead byte. Splitting a coalesced byte stream into individual frames is the transport/session layer’s responsibility, not the codec’s.

Port of the reference C++ PacketCodec.

Structs

DecodedPacket

A decoded frame. For PacketType::Application, valid_lrc reports whether the received LRC matched the recomputed one.

PacketCodec

Frames and parses ECR17 packets for a given LrcMode.

Enums

PacketType

The kind of frame PacketCodec::decode recognized.

Constants

ACK

Positive acknowledgement control byte.

EOT

End of a progress-update frame (its final byte; no LRC).

ETX

End of the application payload (precedes the LRC).

NAK

Negative acknowledgement control byte.

SOH

Start of a progress-update frame.

STX

Start of an application frame.