Goon-Strat

CCSDS Spec Implementation Guide

Source basis:

Tracks/CCSDS/spec.pdf
Tracks/CCSDS/Space Communications Session Control - SpaceCommunicationSessionProtocol.pdf

Purpose

Convert normative CCSDS protocol content into implementation priorities, architecture boundaries, and verification obligations.

Normative Section Mapping

Section 3: SPDU formats and encode/decode behavior
Section 4/6: COP-P logic (FOP-P, FARM-P, sequence/retransmit)
Section 5.1-5.6: session state, frame behavior, physical abstraction interfaces
Annexes B-E: Type 1/2/4/5 SPDU field structures and constraints

Why map by section first:

It prevents implementation drift and keeps code review anchored to normative references.

Architecture Rules Derived From Spec

Keep wire-format parsing isolated from state transitions.
Keep COP-P send/receive state variables explicit and testable.
Keep session state machine transitions data-driven from tables.
Keep physical channel abstraction independent from transport implementation.

Why these rules:

They reflect the protocol’s layered semantics and simplify conformance evidence.

Priority Order

SPDU correctness
COP-P correctness
Frame correctness
State/session correctness
Integration and optimization

Why this order:

Later layers assume lower-layer correctness; reversing order compounds debugging complexity.

Verification Anchors

Every parser/encoder function links to section/table ID.
Every transition rule links to state table reference.
Every service behavior (expedited/sequence-controlled) links to COP-P references.

Common Failure Modes To Guard Against

Endianness mismatches in SPDU and PLCW fields
Sequence wrap-around defects in COP-P
Invalid transition acceptance in state machine
PCID/channel misrouting under multi-channel tests
Inconsistent behavior between mock and network transports

6-Person Spec Governance

Engineer A: section ownership and interpretation authority
Engineer B: conformance evidence quality gate
Engineer C: interoperability behavior consistency checks
Developer A/B/C: implementation and automated evidence generation against section-linked tests

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