Document TCP Protocol - Value 5

[LSantha]

TCP Protocol

Document the TCP Protocol JNode concept in the wiki.

Value: 5

Concept Summary

TCP (Transmission Control Protocol) with full state machine. TCP provides reliable, ordered delivery of data with flow control and congestion control, forming the basis for most network applications in JNode.

Key Files

• net/src/net/org/jnode/net/ipv4/tcp/TCPProtocol.java
• net/src/net/org/jnode/net/ipv4/tcp/TCPHeader.java
• net/src/net/org/jnode/net/ipv4/tcp/TCPControlBlock.java

Occurrences

~250 references in TCP package

Wiki Status

NOT documented

Bridges

Transport layer, Sockets, Reliable delivery

Instructions

Skill to Use

Use the [[update-wiki|update-wiki skill]] (load with skill({ name: "update-wiki" })) for understanding JNode internals.

Context Research

Study TCPProtocol.java, TCPHeader.java, and TCPControlBlock.java to understand the TCP state machine implementation. Review how connections are established, data is transmitted, and connections are torn down. Research flow control and congestion control mechanisms.

Update index.md

• Pages table: Add entry for TCP-Protocol.md
• Concepts → Pages table: Add "TCP Protocol" mapping to [[TCP-Protocol]]
• Source Path → Pages table: Add mappings for net/src/net/org/jnode/net/ipv4/tcp/
• Task Routing table: Add relevant task route(s)

Task Routing Suggestions

1. TCP connection debugging: Understanding state machine is key for connection issues
2. Network performance: TCP congestion control affects performance
3. Socket programming: TCP is the basis for most reliable network applications

Wiki Page Structure

# TCP Protocol

> TCP (Transmission Control Protocol) with full state machine.

## Overview
2-3 paragraph explanation of TCP protocol, its reliable delivery guarantees, and how the state machine works.

## Key Components
| Class / File | Role |
|---|---|
| `net/src/net/org/jnode/net/ipv4/tcp/TCPProtocol.java` | TCP protocol implementation |
| `net/src/net/org/jnode/net/ipv4/tcp/TCPHeader.java` | TCP header handling |
| `net/src/net/org/jnode/net/ipv4/tcp/TCPControlBlock.java` | Connection state management |

## How It Works
Explanation of how TCP works, how connections are established (SYN/ACK), how data is transmitted, how flow control works, and how connections are torn down.

## Gotchas & Non-Obvious Behavior
- TCP state machine is complex with many states
- Retransmission timing is critical for performance
- Congestion control affects throughput

## Related Pages
- [[Network-Stack]]
- [[UDP-Protocol]]
- [[Socket-Buffer]]

---

Related Concepts: TCP, Reliable delivery, State machine, Flow control, Congestion control

[LSantha]

/oc Please proceed with this task.

[opencode-agent]

Done. Created TCP-Protocol.md wiki page documenting JNode's TCP implementation with full state machine. Updated index.md, Changelog.md, and Glossary.md. Pushed to remote and closed issue #66.

Wiki page: https://github.com/LSantha/jnode_ai/wiki/TCP-Protocol

opencode session  |  github run

[LSantha]

/oc Please proceed with this task.

[opencode-agent]

The TCP Protocol wiki documentation is already complete:

• TCP-Protocol.md: Exists with full documentation (state machine, connection lifecycle, data transfer, gotchas)
• index.md: Updated with:
  • Pages table entry (line 57): [[TCP-Protocol]]
  • Concepts → Pages (line 152): "TCP Protocol" mapping
  • Source Path → Pages (line 222): TCP source path
  • Task Routing (lines 232-233): TCP debugging and performance tasks

The wiki was already pushed to remote as indicated in the issue comments. No further action needed.

opencode session  |  github run