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46288e4bef
Wire-format parity fixes in reader.py for trailing fields the
companion-radio firmware emits but the SDK decoder was dropping, plus an
over-read guard on DEFAULT_FLOOD_SCOPE. Each fix uses the existing
BATT_AND_STORAGE defensive-read pattern (up-front minimum-length check
plus per-field cumulative-length gates), so older firmware that doesn't
emit the trailing fields keeps decoding without raising. Every fix ships
a legacy-frame and modern-frame unit test pair.
AUTOADD_CONFIG (PacketType 25): companion-v1.14.0 firmware emits a
trailing max_hops byte (firmware commit 00566741); the SDK dropped it.
Adds a defensive `if len(data) >= 3` read. Pre-v1.14.0 frames decode to
`{"config": ...}` with no max_hops key.
LOGIN_SUCCESS (PacketType 0x85): the new-style RESP_SERVER_LOGIN_OK path
emits three trailing fields the SDK was dropping — server_timestamp (4B,
firmware commit 0e90b731), acl_permissions (1B, 7947e8a2), and
fw_ver_level (1B, 418ae08b), all first shipped in companion-v1.10.0.
Adds per-field length gates (>=12, >=13, >=14). Legacy 8-byte "OK"-path
frames decode unchanged.
ACK (PacketType 0x82): firmware emits a trailing 4-byte trip_time
(round-trip latency in ms) since companion-v1.0.0a (firmware commit
d9dc76f1, Jan 2025) — on the wire ~16 months but never surfaced by the
SDK. Adds an `if len(data) >= 9` read. Legacy 5-byte ACK frames decode
unchanged.
DEFAULT_FLOOD_SCOPE (PacketType 28): firmware emits a 48-byte populated
frame or a 1-byte sentinel when no scope is set. The SDK unconditionally
read 31+16 bytes, over-reading 47 bytes past the end of the sentinel
frame and dispatching `{"scope_name": "", "scope_key": ""}`. Adds an
`if len(data) >= 48` guard so the sentinel dispatches `{}`. Consumers
detecting "no scope" via `payload["scope_name"] == ""` should switch to
a key-presence check.
RAW_DATA: the payload-framing fix this branch originally carried landed
upstream first in PR #86 (commit 44b21be), with identical decode logic
(discard the reserved 0xFF byte, then read the remaining variable-length
payload). That redundant change is dropped here; this commit retains only
its regression test (test_raw_data_realistic_frame), which exercises the
upstream fix end-to-end — the upstream change shipped without a test.
CHANGELOG:
- Decode max_hops trailing byte in AUTOADD_CONFIG (companion-v1.14.0+).
- Decode server_timestamp / acl_permissions / fw_ver_level trailing
fields in LOGIN_SUCCESS (companion-v1.10.0+).
- Decode trip_time trailing field in ACK (companion-v1.0.0a+).
- DEFAULT_FLOOD_SCOPE dispatches `{}` on the 1-byte sentinel frame
instead of `{scope_name: "", scope_key: ""}`. Detect "no scope" via
key presence.
Tests: 10 tests in tests/unit/test_protocol_surface_gaps.py (legacy +
modern frame pair per finding, including a RAW_DATA regression test for
the upstream fix); all 10 pass on the rebased upstream base.
Why: companion-radio firmware has been emitting these fields on the wire
for between 2 and 16 months; SDK consumers (integrations, bots,
dashboards) lose access to data that is on the wire today.
MeshCore Tests
Running Tests
To run the tests, first install the development dependencies:
pip install -e ".[dev]"
Then run the tests using pytest:
# Run all tests
pytest
# Run tests with verbose output
pytest -v
# Run a specific test file
pytest tests/unit/test_commands.py
# Run a specific test
pytest tests/unit/test_commands.py::test_send_msg