feat(autoresearch): exercise peer POST JSON-RPC

[zackees]

Summary

• add bounded POST /rpc fixture dispatch on the RP2350W and ESP32-C6 peer servers
• test discover, ping, status, and unknown-method JSON-RPC requests in both directions
• bound RP request headers to 511 bytes, JSON bodies to 255 bytes, and incomplete requests to two seconds

Verification

• �ash lint --cpp --strict examples/AutoResearch/AutoResearchNet.cppn- �ash compile rp2350w --examples AutoResearch --no-interactiven- �ash compile esp32c6 --examples AutoResearch --no-interactive`n

Limits

No deployment was attempted: COM17 remains unselectable because Windows reports Code 43. This is compile validation only; reverse 4 KiB echo and OTA remain open.

Summary by CodeRabbit

• New Features

  • Added support for JSON-RPC requests using HTTP POST on ESP32 and RP2350W devices.
  • Added request validation, method handling, and clear error responses for invalid or unsupported requests.

• Bug Fixes

  • Improved network request processing by handling complete headers and request bodies reliably.
  • Added safeguards for request timeouts and oversized payloads to improve connection stability.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 9e62db74-b377-487c-8ec8-471654dbe895

📥 Commits

Reviewing files that changed from the base of the PR and between 73d932f and 961b9da.

📒 Files selected for processing (1)

• examples/AutoResearch/AutoResearchNet.cpp

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📝 Walkthrough

Walkthrough

The network example now supports JSON-RPC POST requests on ESP32 and RP2350W. It validates headers and payloads, dispatches supported methods, returns errors, resets request state, and tests four POST RPC cases alongside existing GET coverage.

Changes

JSON-RPC POST transport

Layer / File(s)	Summary
ESP32 RPC endpoint and coverage examples/AutoResearch/AutoResearchNet.cpp	The ESP32 endpoint validates JSON-RPC POST requests and dispatches supported methods. HTTP helpers and tests now support configurable methods and request bodies.
RP2350W request buffering and validation examples/AutoResearch/AutoResearchNet.cpp	RP2350W peer state tracks headers, bodies, content lengths, completion, and request timing. Polling enforces timeouts and payload limits before dispatch.
RP2350W RPC dispatch and tests examples/AutoResearch/AutoResearchNet.cpp	RP2350W returns invalid-request, supported-method, and unknown-method responses. Network coverage now includes four POST RPC cases and twelve total tests.

Estimated code review effort: 4 (Complex) | ~45 minutes

Sequence Diagram(s)

sequenceDiagram
participant HTTPClient
participant AutoResearchNet
participant RPCDispatcher
HTTPClient->>AutoResearchNet: POST /rpc with JSON body
AutoResearchNet->>AutoResearchNet: Validate headers and payload
AutoResearchNet->>RPCDispatcher: Dispatch JSON-RPC method
RPCDispatcher-->>AutoResearchNet: Return method response
AutoResearchNet-->>HTTPClient: Return JSON-RPC result or error

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Possibly related issues

• feat(rp2350w): complete pin-free AutoResearch and ESP32-C6 peer-network bring-up #3832 — The PR adds the network-carried JSON-RPC support and ESP32/RP2350W request validation described by the issue.

Possibly related PRs

• FastLED/FastLED#3843 — Introduces the related AutoResearchNet.cpp ESP32/RP2350W networking implementation.
• FastLED/FastLED#3854 — Directly overlaps with RP2350W POST payload buffering and response testing.
• FastLED/FastLED#3856 — Modifies the same HTTP/RPC test helpers and peer RPC coverage.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/rp2350w-peer-post-rpc

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