Module ack 

ACK (Acknowledgment) control packet — draft-sharabayko-srt-01 §3.2.4, Figure 13.

Three variants share the same header shape and differ only in how much of the CIF is present, distinguished by CIF length on the wire:

• Full (28-byte CIF): all seven fields, sent every 10 ms.
• Small (16-byte CIF): fields up to and including Available Buffer Size.
• Light (4-byte CIF): only Last Acknowledged Packet Sequence Number.

Structs

AckPacket

ACK control packet (§3.2.4, Figure 13). ack_number occupies the header Type-specific Information word (“the sequential number of the full acknowledgment packet starting from 1”); per §3.2.4 it “should be set to 0” for Small/Light ACKs, but is stored and round-tripped verbatim regardless of variant.

Enums

AckCif

The ACK Control Information Field — its shape (Full/Small/Light) is selected by which fields are present on the wire (§3.2.4). Data-carrying ADT: see AckPacket for the label convention rationale.

Constants

ACK_CIF_LEN_FULL

CIF length, in bytes, of a Full ACK (§3.2.4).

ACK_CIF_LEN_LIGHT

CIF length, in bytes, of a Light ACK (§3.2.4).

ACK_CIF_LEN_SMALL

CIF length, in bytes, of a Small ACK (§3.2.4).