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improv_wifi: verify checksums, request device info; add README - #12
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…d README The ESP-IDF port shipped Improv frames through a CRLF-translating stdout and the harness passed anyway, because it never checked a checksum and only ever read a state packet. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011NMrair4gJdBGXVF8ksu6A
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WalkthroughThe PR adds Improv packet checksum validation, device information requests before WiFi provisioning, controlled checksum-error handling, and documentation for the firmware-tester harness and release workflow. ChangesImprov WiFi provisioning
Merge Risk: 🟡 Moderate · up to The PR adds checksum enforcement and a device-information preflight, but the current request frame is malformed for the protocol, so compatible devices may fail or time out before provisioning. The preflight also accepts insufficiently validated responses and ignores the configured timeout, creating bounded compatibility and credential-gating risks; merge should wait for these fixes. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 1 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Pull request overview
This PR hardens the Improv Serial Wi-Fi provisioning harness by validating frame checksums (so serial-byte mangling can’t “pass by luck”) and by issuing a device-info RPC before provisioning to exercise a broader byte range. It also adds a top-level README explaining how to run and release the harness.
Changes:
- Add checksum validation to Improv frame parsing and fail on checksum mismatch.
- Add an initial “request device info” (RPC 0x03) step before sending Wi-Fi credentials.
- Add a README documenting the repo’s purpose, manual usage, and image release flow.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| scripts/improv_wifi.py | Adds checksum enforcement, introduces generic RPC packet builder, and requests device info prior to provisioning. |
| README.md | Documents repository purpose, key scripts, manual run steps, and release workflow. |
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Actionable comments posted: 3
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Inline comments:
In `@scripts/improv_wifi.py`:
- Around line 40-42: Update build_rpc_packet() to include a data-length byte
between command and data, using len(data), and adjust the payload length byte to
account for command, length, and data. Preserve checksum calculation over the
corrected payload so no-data requests encode command 0x03 followed by length
0x00.
- Line 93: Update the device-information handling around the frame parsing to
interpret the RPC payload as length-prefixed strings: skip the command and
data-length bytes, read each string-length byte, decode exactly that many
following bytes, and collect the decoded strings. Print the resulting list
instead of decoding frame[11:-1] as one string.
- Line 118: Update the request_info call in the surrounding flow to pass the
configured args.timeout value, ensuring the command-line timeout controls this
request instead of request_info’s default. Preserve the existing failure
handling when the request still fails.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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Configuration used: Organization UI
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📒 Files selected for processing (2)
README.mdscripts/improv_wifi.py
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@coderabbitai review — all three findings addressed in 1a0b2c8+: RPC data-length byte, length-prefixed info strings, --timeout honored. |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- recent commits ---'
git log --oneline -8
printf '%s\n' '--- file outline ---'
ast-grep outline scripts/improv_wifi.py --items all --view expanded
printf '%s\n' '--- relevant implementation and call sites ---'
rg -n -C 8 -e 'def build_rpc_packet\b' \
-e 'def request_info\b' \
-e 'def main\b' \
-e 'add_argument\b' \
-e 'timeout' \
-e 'INFO|info' \
-e 'RPC|rpc' \
scripts/improv_wifi.pyLength of output: 6412
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Motivation: ESPresense/ESPresense#2497 shipped Improv frames through a CRLF-translating stdout (any 0x0A byte became 0x0D 0x0A) and the HIL passed anyway — the harness never checked a checksum and only read a bare state packet.
🤖 Generated with Claude Code
https://claude.ai/code/session_011NMrair4gJdBGXVF8ksu6A
Summary by CodeRabbit
New Features
Bug Fixes