Replace Python 3.10+ X | Y union syntax with Optional/Union from typing,
remove unsupported @dataclass(slots=True), fix flake8 E203 slice whitespace,
and apply auto-fixed import ordering and quote style.
Modular backend for the BLE log console rewrite:
- Frame parser with sync state machine and checksum auto-detection
(4 modes: XOR/Sum x Full/Header-only); handles incomplete frames
during re-sync search when previously synced
- Internal frame decoder (INIT_DONE, ENH_STAT, FLUSH, INFO)
- Data models: SourceCode, FrameByteCount, FunnelSnapshot, LossType
- Stats package with composition-root StatsAccumulator orchestrating:
- TransportMetrics (RX bytes, lifetime-average throughput)
- FirmwareLossTracker / FirmwareWrittenTracker (ENH_STAT deltas
with first-report absolute value initialization)
- SNGapTracker (sliding window reorder-tolerant SN gap detection)
- PeakBurstTracker (per-source sliding window burst density)
- TrafficSpikeDetector (wire utilization spike detection)
- Wall-clock burst tracker for non-timestamped sources (REDIR)
- Torn-read guard on ENH_STAT reports (baudrate-based plausibility)
with prev-state update on discard to prevent cascading drops
- Console-local metrics (TransportMetrics, PeakBurstTracker) preserved
across INIT_DONE resets; only ENH_STAT-coupled components reset
- UART transport with port validation and exclusive serial access
- Comprehensive test suite (17 test files, 223 tests)
Zhou Xiao